annotate 2.00/compat.py @ 30:f17f19d9eb0a

hasattr -> try in the newly added 2.6 zipfile
author Oleg Oshmyan <chortos@inbox.lv>
date Wed, 24 Nov 2010 23:42:06 +0000
parents dc4be35d17e0
children fe1463e7e24d
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1 #! /usr/bin/env python
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2 # Copyright (c) 2010 Chortos-2 <chortos@inbox.lv>
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3
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4 # A compatibility layer for Python 2.5+. This is what lets test.py
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5 # run on all versions of Python starting with 2.5, including Python 3.
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6
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7 # A few notes regarding some compatibility-driven peculiarities
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8 # in the use of the language that can be seen in all modules:
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9 #
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10 # * Except statements never specify target; instead, when needed,
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11 # the exception is taken from sys.exc_info(). Blame the incompatible
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12 # syntaxes of the except clause in Python 2.5 and Python 3 and the lack
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13 # of preprocessor macros in Python of any version ;P.
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14 #
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15 # * Keyword-only parameters are never used, even for parameters
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16 # that should never be given in as arguments. The reason is
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17 # the laziness of some Python developers who have failed to finish
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18 # implementing them in Python 2 even though they had several years
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19 # of time and multiple version releases to sneak them in.
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20 #
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21 # * Abstract classes are only implemented for Python 2.6 and 2.7.
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22 # ABC's require the abc module and the specification of metaclasses,
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23 # but in Python 2.5, the abc module does not exist, while in Python 3,
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24 # metaclasses are specified using a syntax totally incompatible
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25 # with Python 2 and not usable conditionally via exec() and such
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26 # because it is a detail of the syntax of the class statement itself.
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27
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28 try:
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29 import builtins
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30 except ImportError:
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31 import __builtin__ as builtins
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32
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33 __all__ = ('say', 'basestring', 'range', 'map', 'zip', 'filter', 'items',
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34 'keys', 'values', 'zip_longest', 'callable',
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35 'ABCMeta', 'abstractmethod', 'CompatBuiltins')
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36
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37 try:
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38 # Python 3
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39 exec('say = print')
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40 except SyntaxError:
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41 try:
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42 # Python 2.6/2.7
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43 # An alternative is exec('from __future__ import print_function; say = print');
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44 # if problems arise with the current line, one should try replacing it
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45 # with this one with the future import before abandoning the idea altogether
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46 say = getattr(builtins, 'print')
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47 except Exception:
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48 # Python 2.5
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49 import sys
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50 # This should fully emulate the print function of Python 2.6 in Python 2.3+
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51 # The error messages are taken from Python 2.6
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52 # The name bindings at the bottom of this file are in effect
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53 def saytypeerror(value, name):
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54 return TypeError(' '.join((name, 'must be None, str or unicode, not', type(value).__name__)))
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55 def say(*values, **kwargs):
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56 sep = kwargs.pop('sep' , None)
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57 end = kwargs.pop('end' , None)
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58 file = kwargs.pop('file', None)
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59 if kwargs: raise TypeError("'%s' is an invalid keyword argument for this function" % kwargs.popitem()[0])
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60 if sep is None: sep = ' '
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61 if end is None: end = '\n'
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62 if file is None: file = sys.stdout
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63 if not isinstance(sep, basestring): raise saytypeerror(sep, 'sep')
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64 if not isinstance(end, basestring): raise saytypeerror(end, 'end')
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65 file.write(sep.join(map(str, values)) + end)
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66
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67 def import_urllib():
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68 try:
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69 # Python 3
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70 import urllib.request
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71 return urllib.request, lambda url: urllib.request.urlopen(url).read().decode()
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72 except ImportError:
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73 # Python 2
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74 import urllib
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75 return urllib, lambda url: urllib.urlopen(url).read()
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76
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77 try:
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78 from abc import ABCMeta, abstractmethod
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79 except ImportError:
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80 ABCMeta, abstractmethod = None, lambda x: x
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81
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82 # In all of the following, the try clause is for Python 2 and the except
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83 # clause is for Python 3. More checks are performed than needed
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84 # for standard builds of Python to ensure as much as possible works
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85 # on custom builds.
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86 try:
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87 basestring = basestring
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88 except NameError:
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89 basestring = str
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90
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91 try:
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92 range = xrange
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93 except NameError:
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94 range = range
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95
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96 try:
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97 callable = callable
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98 except NameError:
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99 callable = lambda obj: hasattr(obj, '__call__')
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100
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101 try:
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102 from itertools import imap as map
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103 except ImportError:
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104 map = map
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105
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106 try:
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107 from itertools import izip as zip
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108 except ImportError:
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109 zip = zip
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110
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111 try:
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112 from itertools import ifilter as filter
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113 except ImportError:
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114 filter = filter
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115
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116 items = dict.iteritems if hasattr(dict, 'iteritems') else dict.items
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117 keys = dict.iterkeys if hasattr(dict, 'iterkeys') else dict.keys
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118 values = dict.itervalues if hasattr(dict, 'itervalues') else dict.values
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119
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120 try:
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121 # Python 3
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122 from itertools import zip_longest
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123 except ImportError:
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124 # Python 2.6/2.7
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125 from itertools import izip_longest as zip_longest
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126 except ImportError:
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127 # Python 2.5
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128 from itertools import chain, repeat
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129 # Adapted from the documentation of itertools.izip_longest
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130 def zip_longest(*args, **kwargs):
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131 fillvalue = kwargs.get('fillvalue')
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132 def sentinel(counter=([fillvalue]*(len(args)-1)).pop):
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133 yield counter()
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134 fillers = repeat(fillvalue)
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135 iters = [chain(it, sentinel(), fillers) for it in args]
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136 try:
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137 for tup in zip(*iters):
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138 yield tup
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139 except IndexError:
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140 pass
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141
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142 # Automatically import * from this module into testconf.py's
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143 class CompatBuiltins(object):
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144 __slots__ = 'originals'
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145 def __init__(self):
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146 self.originals = {}
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147 def __enter__(self):
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148 g = globals()
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149 for name in __all__:
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150 if hasattr(builtins, name):
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151 self.originals[name] = getattr(builtins, name)
dc4be35d17e0 Bug fixes
Oleg Oshmyan <chortos@inbox.lv>
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152 setattr(builtins, name, g[name])
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153 def __exit__(self, exc_type, exc_val, exc_tb):
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154 for name in self.originals:
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dc4be35d17e0 Bug fixes
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parents: 25
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155 setattr(builtins, name, self.originals[name])
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ec6f1a132109 A pretty usable version
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156
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f07b7a431ea6 Further 2.00 work
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157 # Support simple testconf.py's written for test.py 1.x
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dc4be35d17e0 Bug fixes
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parents: 25
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158 builtins.xrange = range