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annotate doc/v2_planning/coding_style.txt @ 1329:0f69f303ba91

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forgot to commit... 2 versions: one for /data/lisa6 the other for /data/lisa/data TODO: FIX NOW THAT FRINGANT IS BACK
author gdesjardins
date Thu, 14 Oct 2010 23:54:28 -0400
parents 58a6919d3649
children 879a5633bb52 cba5a348a732
rev   line source
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1 Discussion of Coding-Style
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2 ==========================
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3
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4 Participants
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5 ------------
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6 - Dumitru
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7 - Fred
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8 - David
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9 - Olivier D [leader]
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10
1103
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11 Open for public debate
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12 ----------------------
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13
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14 * File header:
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15 - Do we put the accents in 'Universite de Montreal'?
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16 OD: No (restricting code to ASCII characters is much safer)
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17
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18 - Do we put the Mercurial version number in each file?
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19 OD: No (useless in my experience, if it's a release the version
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20 number can be provided in the README for instance, and in
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21 addition Mercurial IDs cannot be easily compared to figure
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22 out which of two versions is most recent)
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23
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24 * OD: I like always doing the following when subclassing
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25 a class A:
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26 class B(A):
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27 def __init__(self, b_arg_1, b_arg_2, **kw):
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28 super(B, self).__init__(**kw)
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29 ...
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30 The point here is that the constructor always allow for extra keyword
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31 arguments (except for the class at the very top of the hierarchy), which
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32 are automatically passed to the parent class.
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33 Pros:
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34 - You do not need to repeat the parent class arguments whenever you
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35 write a new subclass.
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36 - Whenever you add an argument to the parent class, all child classes
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37 can benefit from it without modifying their code.
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38 Cons:
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39 - One needs to look at the parent classes to see what these arguments
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40 are.
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41 - You cannot use a **kw argument in your constructor for your own
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42 selfish purpose (well, you can actually, but it would look a bit
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43 hackish).
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44 - I have no clue whether one could do this with multiple inheritance.
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45 - Pb if super class adds an argument that has same name as a child class.
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46 Question: Should we encourage this in Pylearn?
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47 JB: +0.5
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48 OD: Was discussed in lab meeting. The feeling was that the last Con was
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49 too dangerous. Note however that if we have some system that
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50 automatically generates proper doc (i.e. with all arguments, by
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51 asking the parent class as well), it could detect the situation
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52 mentioned in that last Con (and solve the first one as well).
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53
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60ef81fe1825 2cents in coding_style
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54
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55 Closed for public debate
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56 ------------------------
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57
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58 * Imperative vs. third-person comments.
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59 # Return the sum of elements in x. <-- imperative
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60 # Returns the sum of elements in x. <-- third-person
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61 OD: I am used to the imperative form and like it better only because it
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62 typically saves one letter (the 's') and is easier to conjugate.
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63 JB: What about being compatible with markup formats that have a :returns:
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64 tag?
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65 OD: That'd make sense. However, when I wrote the above I hadn't looked
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66 closely at PEP257 yet, and I just noticed the following official
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67 recommendation for one-line docstrings in it:
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68 The docstring is a phrase ending in a period. It prescribes the
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69 function or method's effect as a command ("Do this", "Return that"), not as a
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70 description; e.g. don't write "Returns the pathname ...".
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71 Anyone knows which style is most popular in the open-source
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72 community?
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73 OD: In lab meeting Yoshua ruled out: it is a waste of time to even
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74 discuss it. So we let everyone do it the way they like it best.
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75
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76 * Avoid contractions in code comments (particularly in
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77 documentation): "We do not add blue to red because it does not look good"
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78 rather than "We don't add blue to red because it doesn't look good".
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79 OD: I mostly find it to be cleaner (been used to it while writing
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80 scientific articles too).
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81 JB: +1
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82 OD: Discussed in lab meeting, and agreed on.
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83
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84 * Use imports for packages and modules only. I.e. avoid
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85 from foo import *
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86 from foo import Bar
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87 OD: Overall I agree with this. However we probably want to allow some
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88 exceptions, like:
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89 from itertools import imap, izip
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90 Also, some people may want to have shortcuts like
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91 from theano import tensor as T
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92 but I would prefer to forbid this. It is handy when trying stuff in
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93 the interactive interpreter, but in real code it can easily get messy
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94 when you want to copy / paste different pieces of code and they use
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95 different conventions. Typing tensor.* is a bit longer, but a lot more
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96 portable.
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97 JB: I thought that these are nice:
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98 - "from foo import Bar"
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99 - "from foo import Bar, Blah"
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100 What's wrong with them? They keep the code listing short and readable.
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101 I would discourage these forms when symbols 'Bar' and 'Blah' are
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102 ambiguous, in which case the parent module prefix serves to disambiguate
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103 them in the code.
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104 I agree that the "import A as B" form should be discouraged in general,
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105 because that's just confusing and makes code less grep-friendly.
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106 OD: I agree that "from foo import Bar, Blah" is sometimes convenient
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107 (typically when you re-use Bar / Blah many times in the same file),
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108 and would vote in favor of accepting it when it is appropriate.
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109 This guideline was taken from Google's coding recommendation:
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110 "from foo import * or from foo import Bar is very nasty and can
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111 lead to serious maintenance issues because it makes it hard to find
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112 module dependencies."
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113 OD: Decision was taken in committee's meeting to allow
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114 from foo import Bar, Blah
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115 when imported stuff is re-used multiple times in the same file, and
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116 there is no ambiguity.
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117
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118 * Imports should usually be on separate lines.
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119 OD: I would add an exception, saying it is ok to group multiple imports
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120 from the standard library on a single line, e.g.
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121 import os, sys, time
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122 I just don't see much benefit in putting them on separate lines (for
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123 third-party imports I agree it is best to keep them separate, as it
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124 makes dependencies clearer, and diffs look better when someone adds /
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125 removes an import). Does anyone see a good reason to keep standard
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126 library imports on different lines?
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127 JB: what does 'usually' mean here? The guideline seems vacuous.
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128 OD: Sorry my fault, I did not quote the whole guideline from PEP8. The
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129 'usually' was because of what followed:
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130 it's okay to say this though:
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131 from subprocess import Popen, PIPE
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132 (which btw contradicts Google's recommendation mentioned previously)
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133 OD: Decision was taken in committee's meeting to allow multiple imports
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134 on the same line for standard library modules (only).
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135
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136 * The BDFL recommends inserting a blank line between the
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137 last paragraph in a multi-line docstring and its closing quotes, placing
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138 the closing quotes on a line by themselves. This way, Emacs'
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139 fill-paragraph command can be used on it.
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140 OD: I think it is ugly and I have not seen it used much. Any Emacs
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141 user believes it is a must?
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142 OD: Decision was taken in committee's meeting to drop this
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143 recommendation.
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144
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145 * JB: How should we combine capitalization and underscores to name classes
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146 and functions related to an algorithm like 'SGD' or a model like 'RBM'
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147 whose common name is capitalized? Case in point: How should I name a
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148 Hybrid Monte Carlo Sampler? Should I use the common HMC abbreviation?
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149 OD: This one is answered by PEP8 (search HTTPServerError in it).
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150 You should use:
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151 RBMClassName
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152 rbm_function_name
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153 As far as using abbreviations is concerned:
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154 All identifiers in the Python standard library (...) SHOULD use
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155 English words wherever feasible (in many cases, abbreviations and
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156 technical terms are used which aren't English).
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157 so I guess HMC is ok when using Hybrid Monte Carlo is considered to
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158 make some names too long.
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159
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160
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161 Note about warnings
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162 -------------------
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163
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164 Fred: This is a refactored thing from James email of what we should put in message
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165 that we send to the user:
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166 1) Hint where in the code this log come from.
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167 2) Hint how to hide this message? or we should this into documentation.
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168 3) Tell explicitly if the user can ignore it and the consequence.
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169
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170 Existing Python coding style specifications and guidelines
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171 ----------------------------------------------------------
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172
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173 * Must-read
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174 * Official Python coding style guide: http://www.python.org/dev/peps/pep-0008
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175 * Official docstring conventions: http://www.python.org/dev/peps/pep-0257
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176 * Google Python Style Guide: http://google-styleguide.googlecode.com/svn/trunk/pyguide.html
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177 * Interesting
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178 * Code Like a Pythonista: http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html
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179 * Numpy notes on conversion to Python 3: http://projects.scipy.org/numpy/browser/trunk/doc/Py3K.txt
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180 * Can skip
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181 * Python style for university class: http://www.cs.caltech.edu/courses/cs11/material/python/misc/python_style_guide.html
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182 * Mailman coding style: http://barry.warsaw.us/software/STYLEGUIDE.txt
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183 * Some company coding style: http://self.maluke.com/style
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184 * Chandler coding style: http://chandlerproject.org/Projects/ChandlerCodingStyleGuidelines
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185 * Outdated recommendations: http://lists.osafoundation.org/pipermail/dev/2003-March/000479.html
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186 * Mostly some beginners tips: http://learnpython.pbworks.com/PythonTricks
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187 * More beginners tips: http://eikke.com/how-not-to-write-python-code/
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188 * Cogent coding guidelines: http://jaynes.colorado.edu/PythonGuidelines.html
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189 * Djangoo coding guidelines: http://docs.djangoproject.com/en/dev/internals/contributing/#coding-style
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190 * Numpy documentation style guidelines: http://projects.scipy.org/numpy/wiki/CodingStyleGuidelines
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191 * Some random guy guidelines (nothing special): http://www.voidspace.org.uk/python/articles/python_style_guide.shtml
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192
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193 We will probably want to take PEP-8 as starting point, and read what other
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194 people think about it / how other coding guidelines differ from it.
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195
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196 OD: Things about PEP 8 I don't like (but it may be just me):
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197
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198 * If necessary, you can add an extra pair of parentheses around an
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199 expression, but sometimes using a backslash looks better.
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200 --> I rarely find that backslash looks better. In most situations you can
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201 get rid of them. Typically I prefer:
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202 if (cond_1 and
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203 cond_2 and
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204 cond_3):
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205 to
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206 if cond_1 and \
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207 cond_2 and \
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208 cond_3:
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209
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210 * You should use two spaces after a sentence-ending period.
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211 --> Looks weird to me.
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212 (DWF: This is an old convention from the typewriter era. It has more
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213 or less been wiped out by HTML's convention of ignoring extra
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214 whitespace: see http://en.wikipedia.org/wiki/Sentence_spacing for
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215 more detail. I think it's okay to drop this convention in source code.)
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216 OD: Cool, thanks, I guess we can drop it then.
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217
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218 * Missing in PEP 8:
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219 - How to indent multi-line statements? E.g. do we want
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220 x = my_func(a, b, c,
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221 d, e, f)
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222 or
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223 x = my_func(a, b, c,
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224 d, e, f)
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225 or
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226 x = my_func(
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227 a, b, c, d, e, f)
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228 --> Probably depends on the specific situation, but we could have a
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229 few typical examples (and the same happens with multi-lines lists)
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230 (Fred: I would do 2 or 3, but not 1. I find it more redable when the
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231 indent is broken after a paranthesis then at any point.
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232 OD: After thinking about it, I agreee as well. My recommendation would
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233 be to go with 2 when it can fit on two lines, and 3 otherwise. Same
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234 with lists.
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235
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236 Documentation
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237 -------------
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238
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239 How do we write doc?
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240
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241 Compatibility with various Python versions
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242 ------------------------------------------
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243
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244 * Which Python 2.x version do we want to support?
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245
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246 * Is it reasonable to have coding guidelines that would make the code as
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247 compatible as possible with Python 3?
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248
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249 C coding style
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250 --------------
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251
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252 We also need a c-style coding style.
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253
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254 Meeting 2010/09/09
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255 ------------------
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256
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257 * Coding guidelines
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258 PEP 8 & Google should be a good basis to start with.
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259 Task: Highlight the most important points in them (OD).
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260
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261 * Documentation
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262 Use RST with Sphinx.
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263 Task: Provide specific examples on how to document a class, method, and some
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264 specific classes like Op (DE). Modify the theano documentation to include that.
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265 OD: May want to check out
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266 http://projects.scipy.org/numpy/wiki/CodingStyleGuidelines
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267
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268 * Python versions to be supported
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269 Support 2.4 (because some of the clusters are still running 2.4) and write
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270 code that can be converted to 3.x with 2to3 in a straightforward way.
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271 Task: Write to-do's and to-not-do's to avoid compatibility issues. (OD)
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272
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273 * C coding style
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274 How to write C code (in particular for Numpy / Cuda), and how to mix C and
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275 Python.
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276 Task: See if there would be a sensible C code style to follow (maybe look how
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277 Numpy does it), and how projects that mix C and Python deal with it (e.g. use
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278 separate files, or be able to have mixed syntax highlighting?) (FB)
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279
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280 * Program output
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281 Use the warning and logging modules. Avoid print as much as possible.
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282 Task: Look into these modules to define general guidelines e.g. to decide when
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283 to use warning instead of logging. (DWF)
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284
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285 * Automatized code verification
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286 Use pychecker & friends to make sure everything is fine.
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287 Task: Look into the various options available (DE)
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288 Result: See sections 'Tools to help us out' and 'Automating and enforcing coding
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289 style'
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290
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291 * Tests
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292 Force people to write tests. Automatic email reminder of code lines not
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293 covered by tests (see if we can get this from nosetests). Decorator to mark
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294 some classes / methods as not being tested yet, so as to be able to
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295 automatically warn the user when he is using untested stuff (and to remind
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296 ourselves we should add a test).
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297 Task: See feasibility. (OD)
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298 Result: See section 'Enforcing strict testing policy'.
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299
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300 * VIM / Emacs plugins / config files
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301 To enforce good coding style automatically.
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302 Task: Look for existing options. (FB)
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303 (DWF: I have put some time into this for vim, I will send around my files)
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304
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305 Suggestion by PV
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306 ----------------
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307
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308 Have a sample code that showcases everything one should comply to.
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309
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310 Fred's suggestion to solve issue with hashlib not available in Python 2.4:
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311 --------------------------------------------------------------------------
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312
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313 You can do as in theano.gof.cc:
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314
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315 ..code::
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316
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317 if sys.version_info[:2] >= (2,5):
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318 import hashlib
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319 def hash_from_code(msg):
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320 return hashlib.md5(msg).hexdigest()
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321 else:
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322 import md5
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323 def hash_from_code(msg):
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324 return md5.new(msg).hexdigest()
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325
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326
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327 Mercurial commits
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328 -----------------
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329
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330 * How to write good commit messages?
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331 OD: Check Django's guidelines (link above)
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332 * Standardize the merge commit text (what is the message from fetch?)
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333
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334 During committee's meeting, Fred mentioned a bug with Assembla links for
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335 multi-line commits.
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336
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337 Tools to help us out
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338 ---------------------
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339
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340 Dumi:
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341
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342 * pylint: highly configurable and very popular tool, similar in spirit to lint
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343 for C. Can specify a config file, customize/disable warnings and errors, hook
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344 it to vim/emacs and include coding style convensions in the check too. A nice
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345 feature is that you can include a comment like "# pylint: disable-msg=C0103"
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346 into a file and disable a message locally. This is nice and dangerous at the
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347 same time. Another cool feature is incremental checking with caching of
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348 results, which also allows tracking of progress.
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349
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350 * pyflakes: pylint alternative that is supposedly faster, but is I think more
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351 limited in the number of things it is good at: "PyFlakes will tell you when
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352 you have forgotten an import, mistyped a variable name, defined two functions
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353 with the same name, shadowed a variable from another scope, imported a module
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354 twice, or two different modules with the same name, and so on.". Most reviews
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355 found online praise the speed, but note that pylint is clearly superior in
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356 every other respect.
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357
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358 * pychecker: it actually *imports* each module (not sure if pylint does this).
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359 It seems that pylint = pychecker + coding style and that pylint is more
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360 popular.
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361
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362 * pep8: if all you care is about obeying PEP-8:
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363 http://pypi.python.org/pypi/pep8 (includes the actual PEP-8 snippets with the
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364 errors found, which is neat). Otherwise, pylint seems like a superset of this.
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365
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366 * http://www.doughellmann.com/articles/pythonmagazine/completely-different/2008-03-linters/index.html
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367 - article from 2008 comparing pylint, pychecker, and pyflakes. The conclusion
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368 is to use pylint, more or less.
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369
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370 I say we stick with pylint for now as it provides a great degree of flexibility
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371 in a single mature package.
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372
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373 * vim + pylint: http://www.vim.org/scripts/script.php?script_id=891
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374 * emcas + pylint: http://www.emacswiki.org/emacs/PythonProgrammingInEmacs#toc5
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375
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
376 Automating and enforcing coding style
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
377 -------------------------------------
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
378
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
379 Ideally, we would like to have a uniform approach to this, where everyone tests
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
380 against the same tool(s) and uses the same list of disabled warnings etc.
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
381
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
382 Dumi: there are several ways of approaching this, independently of the tools used:
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
383
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
384 * Create a precommit hook for mercurial, which runs the tool(s) of choice and
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
385 generates warnings or aborts the commit process. This hook is a simple Python
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
386 module (well, as simple as we want it to be), which we can include into
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
387 everyone's hgrc, in the precommit.pylint variable, for instance. An example
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
388 is http://github.com/jrburke/dvcs_jslint/blob/master/dvcs_jslint.js. The
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
389 advantage of this approach is that the load is distributed and
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
390 errors/warnings are caught client-side, before the commit.
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
391
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
392 * Another client-side option is to have editor plugins for the various style
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
393 checkers: vim and emacs can access pylint pretty easily for instance.
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
394
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
395 * Instead of doing this client-side, one can do things server-side. On
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
396 Assembla, this means using their Webhooks
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
397 (http://www.assembla.com/spaces/demostuff/webhook_tool), since HTTP-based
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
398 hooks that we would need to tie with our buildbot server (whichever server we
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
399 choose that to be).
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
400
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
401 * I (DE) prefer starting with the client-side approach, as it is easier to
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
402 implement, has no single point of failure and is deployable fast. We could
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
403 have a "batch" script that runs our lint tools in conjunction with hg
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
404 annotate and sends hate-mail once a week to offenders who have somehow
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
405 slipped things through the cracks. Also on the server-side we could run
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
406 time-consuming checking (though how such checks would differ from tests is
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
407 unclear).
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
408
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
409 Note that:
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
410
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
411 * I haven't found anything ready-made online, so we need to write these
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
412 hooks ourselves.
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
413 * I think we should make it so that it is not possible to commit things if
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
414 pylint reports an actual error.
b70a1fcb7b4f coding_style: tools to make life easier and automating certain processes
Dumitru Erhan <dumitru.erhan@gmail.com>
parents: 1152
diff changeset
415
1123
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
416 Type checking
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
417 -------------
1103
56c5f0990869 coding_style: More work on some guidelines, also put some points to debate in a specific section
Olivier Delalleau <delallea@iro>
parents: 1075
diff changeset
418
1123
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
419 (Suggested by Francois Savard)
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
420
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
421 vu que vous êtes en train de vous occuper de l'aspect coding style, je
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
422 mentionne ceci, à faire ce que vous en voulez: j'aime bien éviter des
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
423 erreurs sur l'ordre de mes paramètres, sur les assumptions sur les
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
424 paramètres etc. en faisant des argument check. Ça remplace un peu le
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
425 static type checking des langages genre Java.
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
426
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
427 En Python y'a une façon élégante de définir ses propres typecheckers,
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
428 value checkers etc. et ensuite les passer en paramètre à un décorateur de
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
429 fonction:
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
430
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
431 http://code.activestate.com/recipes/454322-type-checking-decorator/
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
432
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
433 (Juste un exemple, vu que les checks peuvent être plus élaborés, inclure
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
434 des value checks (>0 etc.), être flexibles pour ne pas demander que ce
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
435 soit un type fixe mais plutôt que ça réponde à certaines contraintes (que
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
436 ça "ressemble" à un float, p. ex.). J'avais développé une lib pour faire
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
437 qqch du genre en Javascript).
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
438
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
439 Je ne sais pas si vous comptiez parler de ça, et si ça vaut la peine, mais
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
440 personnellement je préfère du code à des commentaires qui peuvent être out
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
441 of sync avec le contenu d'une méthode. Si vous croyez que ça vaut la peine,
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
442 vous pourriez p-e définir des type/value-checkers standards pour éviter que
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
443 tout le monde redéfinissent les siens à sa façon.
1a1c0c3adcca coding_style: Added suggestion made by email by Francois about type checking
Olivier Delalleau <delallea@iro>
parents: 1113
diff changeset
444
1141
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
445 OD: This was discussed in committee's meeting. We agreed to provide ways to do
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
446 this, but not to enforce its usage.
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
447
1132
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
448 Enforcing strict testing policy
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
449 -------------------------------
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
450
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
451 The `coverage` third-party module provides a way to gather code coverage
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
452 statistics in the test suite. `nosetests` has a plugin that can be activated
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
453 with the --with-coverage option to use this module.
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
454 It is possible to know which lines specifically lack coverage. However, we
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
455 will probably want to post-process this data to do more than a simple report
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
456 (which noone will care about). This could be done either by parsing nosetests'
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
457 coverage output, or modifying its coverage plugin, or writing our own version
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
458 of it. The main goal would be to identify who is responsible for writing lines
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
459 that are not currently covered (using 'hg annotate'), in order to send email
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
460 notifications.
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
461
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
462 We should aim at 100% code coverage in tests. This is realistic because
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
463 `coverage` offers ways to ignore coverage for lines we explicitely do not want
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
464 to cover (typically debug code, or AssertionError / NotImplementedError that
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
465 are not supposed to be triggered during normal usage).
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
466 We may need to do some advanced processing though to e.g. collect results from
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
467 multiple build bots, if for instance some bot is running tests without GPU
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
468 support, and another one is taking care of the GPU tests.
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
469
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
470 Code that should be tested but for which no test is currently written would
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
471 also require some decorator / helper function that would trigger a warning at
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
472 run-time (only once / execution). This could be enforced by adopting a
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
473 different policy about lack-of-coverage notification emails, depending on
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
474 whether or not the warning is present:
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
475 - if there is no warning, daily email notification (ADD A WARNING!!!)
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
476 - if there is a warning, weekly email notification (ADD A TEST!!!)
f0a1b88367b0 coding_style: Looked into feasibility of forcing developers to test their code
Olivier Delalleau <delallea@iro>
parents: 1130
diff changeset
477
1140
7d2e65249bf9 coding_style: Closed some open questions for which a decision was reached during meeting
Olivier Delalleau <delallea@iro>
parents: 1138
diff changeset
478 Meeting 2010/09/16
7d2e65249bf9 coding_style: Closed some open questions for which a decision was reached during meeting
Olivier Delalleau <delallea@iro>
parents: 1138
diff changeset
479 ------------------
7d2e65249bf9 coding_style: Closed some open questions for which a decision was reached during meeting
Olivier Delalleau <delallea@iro>
parents: 1138
diff changeset
480
1141
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
481 Tasks to be performed by tomorrow:
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
482 * OD:
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
483 * Write down summary of Python coding style recommendations
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
484 * Start a file that showcases those guidelines
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
485 * DWF:
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
486 * Look into recommendations on how to document a class, method, ...
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
487 * Write recommendations on when to use logging vs. warning
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
488 * Make public some configuration files / plugins for vim
6c79394b6b20 coding_style: Decisions made during today's meeting
Olivier Delalleau <delallea@iro>
parents: 1140
diff changeset
489 * Come up with official common file header (license in particular)
1140
7d2e65249bf9 coding_style: Closed some open questions for which a decision was reached during meeting
Olivier Delalleau <delallea@iro>
parents: 1138
diff changeset
490
1170
53340a8df1fa coding_style: Started to write full code sample
Olivier Delalleau <delallea@iro>
parents: 1162
diff changeset
491 Script usage documentation
53340a8df1fa coding_style: Started to write full code sample
Olivier Delalleau <delallea@iro>
parents: 1162
diff changeset
492 --------------------------
53340a8df1fa coding_style: Started to write full code sample
Olivier Delalleau <delallea@iro>
parents: 1162
diff changeset
493
53340a8df1fa coding_style: Started to write full code sample
Olivier Delalleau <delallea@iro>
parents: 1162
diff changeset
494 OD: It would be nice to have some standardized way of parsing a script's
53340a8df1fa coding_style: Started to write full code sample
Olivier Delalleau <delallea@iro>
parents: 1162
diff changeset
495 arguments and displaying the script usage doc to the user.
53340a8df1fa coding_style: Started to write full code sample
Olivier Delalleau <delallea@iro>
parents: 1162
diff changeset
496
1178
10bc5ebb5823 coding_style: Added note about the need to provide guidelines for serialization-friendly code
Olivier Delalleau <delallea@iro>
parents: 1170
diff changeset
497 Recommendations for serialization
10bc5ebb5823 coding_style: Added note about the need to provide guidelines for serialization-friendly code
Olivier Delalleau <delallea@iro>
parents: 1170
diff changeset
498 ---------------------------------
10bc5ebb5823 coding_style: Added note about the need to provide guidelines for serialization-friendly code
Olivier Delalleau <delallea@iro>
parents: 1170
diff changeset
499
10bc5ebb5823 coding_style: Added note about the need to provide guidelines for serialization-friendly code
Olivier Delalleau <delallea@iro>
parents: 1170
diff changeset
500 We need to add coding style guidelines to make sure code is properly
10bc5ebb5823 coding_style: Added note about the need to provide guidelines for serialization-friendly code
Olivier Delalleau <delallea@iro>
parents: 1170
diff changeset
501 serializable.
10bc5ebb5823 coding_style: Added note about the need to provide guidelines for serialization-friendly code
Olivier Delalleau <delallea@iro>
parents: 1170
diff changeset
502
1255
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
503 Meeting 2010/09/24
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
504 ------------------
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
505
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
506 FB: Look into commit guidelines.
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
507 DE: Write guidelines on how to document a class / method (maybe also some
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
508 typical class like an Op)
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
509 DWF: Write guidelines on how to write serializable code
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
510 OD: Finish code sample that showcases all (or many) guidelines, look into
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
511 feasibility of passing arguments to super classes with **kw.
58a6919d3649 coding_style: Added tasks discussed in today's meeting
Olivier Delalleau <delallea@iro>
parents: 1181
diff changeset
512