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comparison docs/pycon2010/pycon2010.rst @ 344:4300ef912f4a

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author catherine@Drou
date Tue, 16 Feb 2010 14:05:25 -0500
parents 2ce34ad4e520
children 6fe1e75e3a67
comparison
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343:787573d350c5 344:4300ef912f4a
1 py 3 1 =====
2 Title
3 =====
2 4
3 Web 2.0 5 Web 2.0
4 ======= 6 =======
5 7
6 .. image:: web-2-0-logos.gif 8 .. image:: web-2-0-logos.gif
7 :height: 300 px 9 :height: 300px
8 10
9 But first... 11 But first...
10 ============ 12 ============
11 13
12 .. image:: sargon.jpg 14 .. image:: sargon.jpg
13 :height: 300 px 15 :height: 300px
14 16
15 Sargon the Great founded the Akkadian Empire 17 Sargon the Great
16 in the twenty-third century BC. 18 Founder of Akkadian Empire
19
20 .. twenty-third century BC
17 21
18 In between 22 In between
19 ========== 23 ==========
20 24
21 .. image:: apple.jpg 25 .. image:: apple.jpg
22 :height: 300 px 26 :height: 300px
23 27
24 Unlike the Akkadian Empire, the CLI will never disappear. 28 Command-Line Interface
25 29 Unlike the Akkadian Empire,
26 line-oriented command interpreter 30 the CLI will never die.
27 command-line interface
28 text user interface
29 terminal user interface
30 console
31 shell
32 31
33 Defining 32 Defining
34 ======== 33 ========
34
35 - "Line-oriented command interpreter"
36 - "Command-line interface"
37 - "Shell"
35 38
36 Prompt accepts free text input 39 * Accepts free text input at prompt
37 Outputs lines of text 40 * Outputs lines of text
38 CLI environment persists 41 * Persistent CLI environment
39 42
40 Examples 43 Examples
41 ======== 44 ========
42 45
43 Bash, Korn, zsh 46 * Bash, Korn, zsh
44 Python shell 47 * Python shell
45 screen 48 * screen
46 Zork 49 * Zork
47 ed 50 * SQL clients: psql, SQL*\Plus, mysql...
48 SQL clients: psql, SQL*\Plus, mysql... 51 * ed
52
53 .. ``ed`` proves that CLI is sometimes the wrong answer.
49 54
50 != Command Line Utilities 55 != Command Line Utilities
51 ========================= 56 =========================
52 57
53 Accept single set of arguments at 58 * Accept arguments at invocation
54 invocation, execute, terminate 59 * execution
60 * terminate
55 61
56 dir 62 Examples
57 grep 63 --------
58 ping 64 * ls
65 * grep
66 * ping
59 67
60 sys.argv 68 Use ``sys.argv``, ``optparse``
61 optparse
62 69
63 != Text User Interfaces 70 != "Text User Interfaces", "Consoles"
64 ======================= 71 =====================================
65 72
66 ("console") 73 * Use entire (session) screen
67 74 * I/O is *not* line-by-line
68 Use entire (session) screen
69 Not line-by-line
70 75
71 .. image:: urwid.png 76 .. image:: urwid.png
72 :height: 300px 77 :height: 300px
73 78
74 curses 79 Use ``curses``, ``urwid``
75 urwid
76 80
81 Tradeoff
82 ========
77 83
78 foo a b c -> 84 .. image:: ease.png
79 self.do_foo('a b c') 85 :height: 300px
80 self.default('foo a b c') 86
81
82 pirate.py 87 pirate.py
83 ========= 88 =========
84 89
85 :: 90 ::
86 91
90 pass 95 pass
91 96
92 pirate = Pirate() 97 pirate = Pirate()
93 pirate.cmdloop() 98 pirate.cmdloop()
94 99
95 history: cursor 100 Nothing here... but history and help
96 ctrl-r
97 help
98 101
102 .. ctrl-r for bash-style history
103
104 Fundamental prrrinciple
105 =======================
106
107 .. class: huge
108
109 ``foo a b c`` ->
110
111 ``self.do_foo('a b c')``
112
113 ``do_``-methods: pirate2.py
114 ===========================
115
116 ::
117
118 class Pirate(Cmd):
119 gold = 10
120 def do_loot(self, arg):
121 'Seize booty frrrom a passing ship.'
122 self.gold += 1
123 print('Now we gots {0} doubloons'.format(self.gold))
124 def do_drink(self, arg):
125 'Drown your sorrrows in rrrum.'
126 self.gold -= 1
127 print('Now we gots {0} doubloons'.format(self.gold))
128
129 .. do_methods; more help
130
131 Hooks
132 =====
133
134 .. image:: hook.jpeg
135 :height: 300px
136
137 Hooks: pirate3.py
138 =================
139
140 ::
141
142 class Pirate(Cmd):
143 gold = 3
144 def do_loot(self, arg):
145 'Drown your sorrrows in rrrum.'
146 self.gold += 1
147 def do_drink(self, arg):
148 'Drown your sorrrows in rrrum.'
149 self.gold -= 1
150 def postcmd(self, stop, line):
151 print('Now we gots {0} doubloons'.format(self.gold))
152
153 Arguments: pirate4.py
154 =====================
155
156 ::
157
158 def do_drink(self, arg):
159 '''Drown your sorrrows in rrrum.
160
161 drink [n] - drink [n] barrel[s] o' rum.'''
162 try:
163 self.gold -= int(arg)
164 except:
165 if arg:
166 print('''What's "{0}"? I'll take rrrum.'''.format(arg))
167 self.gold -= 1
168
169 quitting: pirate5.py
170 ====================
171
172 ::
173
174 def postcmd(self, stop, line):
175 print('Now we gots {0} doubloons'.format(self.gold))
176 if self.gold < 0:
177 print("Off to debtorrr's prrrison. Game overrr.")
178 return True
179 return stop
180 def do_quit(self, arg):
181 print("Quiterrr!")
182 return True
183
184 prompts and defaults: pirate6.py
185 ================================
186
187 ::
188
189 prompt = 'arrr> '
190 def default(self, line):
191 print('What mean ye by "{0}"?'.format(line))