Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_setcomps.py @ 65035:87f4b32905df 2.7

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Cosmetic fix to use print function.
author Hirokazu Yamamoto <ocean-city@m2.ccsnet.ne.jp>
date Fri, 01 Oct 2010 10:48:47 +0000
parents edfed0e32ced
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
58250
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1 doctests = """
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2 ########### Tests mostly copied from test_listcomps.py ############
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3
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4 Test simple loop with conditional
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5
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6 >>> sum({i*i for i in range(100) if i&1 == 1})
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7 166650
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8
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9 Test simple case
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10
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11 >>> {2*y + x + 1 for x in (0,) for y in (1,)}
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12 set([3])
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13
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14 Test simple nesting
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15
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16 >>> list(sorted({(i,j) for i in range(3) for j in range(4)}))
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17 [(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3)]
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18
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19 Test nesting with the inner expression dependent on the outer
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20
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21 >>> list(sorted({(i,j) for i in range(4) for j in range(i)}))
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22 [(1, 0), (2, 0), (2, 1), (3, 0), (3, 1), (3, 2)]
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23
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24 Make sure the induction variable is not exposed
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25
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26 >>> i = 20
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27 >>> sum({i*i for i in range(100)})
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28 328350
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29
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30 >>> i
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31 20
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32
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33 Verify that syntax error's are raised for setcomps used as lvalues
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34
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35 >>> {y for y in (1,2)} = 10 # doctest: +IGNORE_EXCEPTION_DETAIL
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36 Traceback (most recent call last):
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37 ...
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38 SyntaxError: ...
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39
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40 >>> {y for y in (1,2)} += 10 # doctest: +IGNORE_EXCEPTION_DETAIL
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41 Traceback (most recent call last):
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42 ...
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43 SyntaxError: ...
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44
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45
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46 Make a nested set comprehension that acts like set(range())
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47
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48 >>> def srange(n):
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49 ... return {i for i in range(n)}
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50 >>> list(sorted(srange(10)))
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51 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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52
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53 Same again, only as a lambda expression instead of a function definition
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54
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55 >>> lrange = lambda n: {i for i in range(n)}
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56 >>> list(sorted(lrange(10)))
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57 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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58
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59 Generators can call other generators:
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60
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61 >>> def grange(n):
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62 ... for x in {i for i in range(n)}:
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63 ... yield x
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64 >>> list(sorted(grange(5)))
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65 [0, 1, 2, 3, 4]
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66
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67
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68 Make sure that None is a valid return value
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69
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70 >>> {None for i in range(10)}
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71 set([None])
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72
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73 ########### Tests for various scoping corner cases ############
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74
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75 Return lambdas that use the iteration variable as a default argument
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76
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77 >>> items = {(lambda i=i: i) for i in range(5)}
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78 >>> {x() for x in items} == set(range(5))
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79 True
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80
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81 Same again, only this time as a closure variable
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82
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83 >>> items = {(lambda: i) for i in range(5)}
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84 >>> {x() for x in items}
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85 set([4])
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86
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87 Another way to test that the iteration variable is local to the list comp
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88
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89 >>> items = {(lambda: i) for i in range(5)}
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90 >>> i = 20
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91 >>> {x() for x in items}
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92 set([4])
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93
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94 And confirm that a closure can jump over the list comp scope
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95
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96 >>> items = {(lambda: y) for i in range(5)}
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97 >>> y = 2
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98 >>> {x() for x in items}
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99 set([2])
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100
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101 We also repeat each of the above scoping tests inside a function
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102
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103 >>> def test_func():
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104 ... items = {(lambda i=i: i) for i in range(5)}
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105 ... return {x() for x in items}
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106 >>> test_func() == set(range(5))
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107 True
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108
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109 >>> def test_func():
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110 ... items = {(lambda: i) for i in range(5)}
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111 ... return {x() for x in items}
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112 >>> test_func()
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113 set([4])
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114
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115 >>> def test_func():
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116 ... items = {(lambda: i) for i in range(5)}
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117 ... i = 20
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118 ... return {x() for x in items}
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119 >>> test_func()
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120 set([4])
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121
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122 >>> def test_func():
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123 ... items = {(lambda: y) for i in range(5)}
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124 ... y = 2
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125 ... return {x() for x in items}
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126 >>> test_func()
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127 set([2])
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128
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129 """
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130
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131
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Alexandre Vassalotti <alexandre@peadrop.com>
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132 __test__ = {'doctests' : doctests}
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133
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134 def test_main(verbose=None):
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135 import sys
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136 from test import test_support
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Alexandre Vassalotti <alexandre@peadrop.com>
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137 from test import test_setcomps
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138 test_support.run_doctest(test_setcomps, verbose)
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139
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Alexandre Vassalotti <alexandre@peadrop.com>
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140 # verify reference counting
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141 if verbose and hasattr(sys, "gettotalrefcount"):
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142 import gc
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Alexandre Vassalotti <alexandre@peadrop.com>
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143 counts = [None] * 5
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144 for i in range(len(counts)):
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Alexandre Vassalotti <alexandre@peadrop.com>
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145 test_support.run_doctest(test_setcomps, verbose)
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146 gc.collect()
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Alexandre Vassalotti <alexandre@peadrop.com>
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147 counts[i] = sys.gettotalrefcount()
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148 print(counts)
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149
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150 if __name__ == "__main__":
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151 test_main(verbose=True)