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annotate Lib/test/test_unpack.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 1d84bf5f9478
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 doctests = """
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2
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3 Unpack tuple
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4
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5 >>> t = (1, 2, 3)
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6 >>> a, b, c = t
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7 >>> a == 1 and b == 2 and c == 3
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8 True
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9
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10 Unpack list
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11
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12 >>> l = [4, 5, 6]
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13 >>> a, b, c = l
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14 >>> a == 4 and b == 5 and c == 6
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15 True
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16
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17 Unpack implied tuple
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18
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19 >>> a, b, c = 7, 8, 9
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20 >>> a == 7 and b == 8 and c == 9
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21 True
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22
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23 Unpack string... fun!
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24
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25 >>> a, b, c = 'one'
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26 >>> a == 'o' and b == 'n' and c == 'e'
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27 True
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28
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29 Unpack generic sequence
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30
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31 >>> class Seq:
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32 ... def __getitem__(self, i):
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33 ... if i >= 0 and i < 3: return i
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34 ... raise IndexError
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35 ...
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36 >>> a, b, c = Seq()
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37 >>> a == 0 and b == 1 and c == 2
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38 True
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39
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40 Single element unpacking, with extra syntax
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41
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42 >>> st = (99,)
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43 >>> sl = [100]
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44 >>> a, = st
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45 >>> a
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46 99
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47 >>> b, = sl
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48 >>> b
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49 100
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50
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51 Now for some failures
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52
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53 Unpacking non-sequence
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54
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55 >>> a, b, c = 7
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56 Traceback (most recent call last):
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57 ...
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58 TypeError: 'int' object is not iterable
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60 Unpacking tuple of wrong size
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61
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62 >>> a, b = t
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63 Traceback (most recent call last):
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64 ...
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65 ValueError: too many values to unpack
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66
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67 Unpacking tuple of wrong size
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68
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69 >>> a, b = l
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70 Traceback (most recent call last):
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71 ...
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72 ValueError: too many values to unpack
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73
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74 Unpacking sequence too short
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75
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76 >>> a, b, c, d = Seq()
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77 Traceback (most recent call last):
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78 ...
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79 ValueError: need more than 3 values to unpack
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80
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81 Unpacking sequence too long
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82
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83 >>> a, b = Seq()
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84 Traceback (most recent call last):
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85 ...
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86 ValueError: too many values to unpack
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87
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88 Unpacking a sequence where the test for too long raises a different kind of
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89 error
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91 >>> class BozoError(Exception):
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92 ... pass
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93 ...
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94 >>> class BadSeq:
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95 ... def __getitem__(self, i):
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96 ... if i >= 0 and i < 3:
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97 ... return i
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98 ... elif i == 3:
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99 ... raise BozoError
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100 ... else:
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101 ... raise IndexError
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102 ...
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103
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104 Trigger code while not expecting an IndexError (unpack sequence too long, wrong
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105 error)
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106
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107 >>> a, b, c, d, e = BadSeq()
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108 Traceback (most recent call last):
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109 ...
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110 BozoError
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111
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112 Trigger code while expecting an IndexError (unpack sequence too short, wrong
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113 error)
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114
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115 >>> a, b, c = BadSeq()
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116 Traceback (most recent call last):
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117 ...
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118 BozoError
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119
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120 """
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121
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122 __test__ = {'doctests' : doctests}
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123
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124 def test_main(verbose=False):
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125 from test import test_support
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126 from test import test_unpack
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127 test_support.run_doctest(test_unpack, verbose)
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128
c39f83fdd4d0 Port test_unpack to doctest (patch #736962).
Johannes Gijsbers <jlg@dds.nl>
parents: 24442
diff changeset
129 if __name__ == "__main__":
c39f83fdd4d0 Port test_unpack to doctest (patch #736962).
Johannes Gijsbers <jlg@dds.nl>
parents: 24442
diff changeset
130 test_main(verbose=True)