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Some additional notes on some of the tasks and points from the meeting.
author wardefar@grincheux.iro.umontreal.ca
date Thu, 09 Sep 2010 15:57:48 -0400
parents 64720cdca3d3
children 4f287324a5ad
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
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11 Existing Python coding style specifications and guidelines
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12 ----------------------------------------------------------
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13
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14 * http://www.python.org/dev/peps/pep-0008/
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15 * http://www.python.org/dev/peps/pep-0257/
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16 * http://google-styleguide.googlecode.com/svn/trunk/pyguide.html
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17 * http://www.voidspace.org.uk/python/articles/python_style_guide.shtml
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18 * http://python.net/~goodger/projects/pycon/2007/idiomatic/handout.html
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19 * http://www.cs.caltech.edu/courses/cs11/material/python/misc/python_style_guide.html
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20 * http://barry.warsaw.us/software/STYLEGUIDE.txt
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21 * http://self.maluke.com/style
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22 * http://chandlerproject.org/Projects/ChandlerCodingStyleGuidelines
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23 * http://lists.osafoundation.org/pipermail/dev/2003-March/000479.html
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24 * http://learnpython.pbworks.com/PythonTricks
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25 * http://eikke.com/how-not-to-write-python-code/
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26 * http://jaynes.colorado.edu/PythonGuidelines.html
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27 * http://docs.djangoproject.com/en/dev/internals/contributing/#coding-style
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28 * http://projects.scipy.org/numpy/wiki/CodingStyleGuidelines
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29
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30 We will probably want to take PEP-8 as starting point, and read what other
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31 people think about it / how other coding guidelines differ from it.
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32
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33 Dumi: we should also try to find tools that automate these
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34 processes: pylint, pyflakes, pychecker, pythontidy
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35
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36 OD: Things about PEP 8 I don't like (but it may be just me):
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37
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38 * If necessary, you can add an extra pair of parentheses around an
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39 expression, but sometimes using a backslash looks better.
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40 --> I rarely find that backslash looks better. In most situations you can
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41 get rid of them. Typically I prefer:
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42 if (cond_1 and
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43 cond_2 and
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44 cond_3):
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45 to
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46 if cond_1 and \
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47 cond_2 and \
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48 cond_3:
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49
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50 * You should use two spaces after a sentence-ending period.
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51 --> Looks weird to me.
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52 (DWF: This is an old convention from the typewriter era. It has more
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53 or less been wiped out by HTML's convention of ignoring extra
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54 whitespace: see http://en.wikipedia.org/wiki/Sentence_spacing for
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55 more detail. I think it's okay to drop this convention in source code.)
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56
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57 * Imports should usually be on separate lines
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58 --> Can be a lot of lines wasted for no obvious benefit. I think this is
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59 mostly useful when you import different modules from different places,
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60 but I would say that for instance for standard modules it would be
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61 better to import them all on a single line (doing multiple lines only
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62 if there are too many of them), e.g. prefer:
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63 import os, sys, time
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64 to
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65 import os
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66 import sys
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67 import time
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68 However, I agree about separating imports between standard lib / 3rd
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69 party, e.g. prefer:
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70 import os, sys, time
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71 import numpy, scipy
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72 to
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73 import numpy, os, scipy, sys, time
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74 (Personal note: preferably order imports by alphabetical order, makes
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75 it easier to quickly see if a specific module is already imported,
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76 and avoids duplicated imports)
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77
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78 * Missing in PEP 8:
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79 - How to indent multi-line statements? E.g. do we want
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80 x = my_func(a, b, c,
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81 d, e, f)
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82 or
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83 x = my_func(a, b, c,
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84 d, e, f)
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85 or
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86 x = my_func(
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87 a, b, c, d, e, f)
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88 --> Probably depends on the specific situation, but we could have a
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89 few typical examples (and the same happens with multi-lines lists)
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90
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91 * From PEP 257: The BDFL [3] recommends inserting a blank line between the
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92 last paragraph in a multi-line docstring and its closing quotes, placing
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93 the closing quotes on a line by themselves. This way, Emacs'
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94 fill-paragraph command can be used on it.
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95 --> I have nothing against Emacs, but this is ugly!
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96
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97 Documentation
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98 -------------
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99
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100 How do we write doc?
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101
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102 Compatibility with various Python versions
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103 ------------------------------------------
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104
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105 * Which Python 2.x version do we want to support?
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106
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107 * Is it reasonable to have coding guidelines that would make the code as
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108 compatible as possible with Python 3?
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109
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110 C coding style
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111 --------------
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112
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113 We also need a c-style coding style.
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114
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115 Meeting 2010/09/09
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116 ------------------
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117
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118 * Coding guidelines
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119 PEP 8 & Google should be a good basis to start with.
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120 Task: Highlight the most important points in them (OD).
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121
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122 * Documentation
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123 Use RST with Sphinx.
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124 Task: Provide specific examples on how to document a class, method, and some
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125 specific classes like Op (DE).
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126
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127 * Python versions to be supported
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128 Support 2.4 (because some of the clusters are still running 2.4) and write
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129 code that can be converted to 3.x with 2to3 in a straightforward way.
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130 Task: Write to-do's and to-not-do's to avoid compatibility issues. (OD)
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131 (DWF: Pauli Virtanen and others have put together extensive
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132 documentation in the process of porting NumPy to Py3K, see his notes at
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133 http://projects.scipy.org/numpy/browser/trunk/doc/Py3K.txt -- this is
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134 the most complete resource for complicated combinations of Python and C).
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135
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136
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137 * C coding style
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138 How to write C code (in particular for Numpy / Cuda), and how to mix C and
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139 Python.
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140 Task: See if there would be a sensible C code style to follow (maybe look how
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141 Numpy does it), and how projects that mix C and Python deal with it (e.g. use
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142 separate files, or be able to have mixed syntax highlighting?) (FB)
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143
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144 * Program output
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145 Use the warning and logging modules. Avoid print as much as possible.
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146 Task: Look into these modules to define general guidelines e.g. to decide when
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147 to use warning instead of logging. (DWF)
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148
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149 * Automatized code verification
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150 Use pychecker & friends to make sure everything is fine.
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151 Task: Look into the various options available (DE)
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152
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153 * Tests
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154 Force people to write tests. Automatic email reminder of code lines not
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155 covered by tests (see if we can get this from nosetests). Decorator to mark
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156 some classes / methods as not being tested yet, so as to be able to
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157 automatically warn the user when he is using untested stuff (and to remind
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158 ourselves we should add a test).
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159 Task: See feasibility. (OD)
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160
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161 * VIM / Emacs plugins / config files
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162 To enforce good coding style automatically.
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163 Task: Look for existing options. (FB)
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164 (DWF: I have put some time into this for vim, I will send around my files)