Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_code.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 614c84670c63
children
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1 """This module includes tests of the code object representation.
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2
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3 >>> def f(x):
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4 ... def g(y):
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5 ... return x + y
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6 ... return g
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7 ...
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8
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9 >>> dump(f.func_code)
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10 name: f
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11 argcount: 1
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12 names: ()
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13 varnames: ('x', 'g')
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14 cellvars: ('x',)
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15 freevars: ()
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16 nlocals: 2
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17 flags: 3
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18 consts: ('None', '<code object g>')
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19
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20 >>> dump(f(4).func_code)
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21 name: g
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22 argcount: 1
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23 names: ()
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24 varnames: ('y',)
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25 cellvars: ()
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26 freevars: ('x',)
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27 nlocals: 1
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28 flags: 19
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29 consts: ('None',)
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30
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31 >>> def h(x, y):
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32 ... a = x + y
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33 ... b = x - y
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34 ... c = a * b
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35 ... return c
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36 ...
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37 >>> dump(h.func_code)
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38 name: h
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39 argcount: 2
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40 names: ()
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41 varnames: ('x', 'y', 'a', 'b', 'c')
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42 cellvars: ()
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43 freevars: ()
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44 nlocals: 5
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45 flags: 67
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46 consts: ('None',)
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47
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48 >>> def attrs(obj):
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49 ... print obj.attr1
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50 ... print obj.attr2
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51 ... print obj.attr3
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52
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53 >>> dump(attrs.func_code)
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54 name: attrs
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55 argcount: 1
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56 names: ('attr1', 'attr2', 'attr3')
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57 varnames: ('obj',)
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58 cellvars: ()
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59 freevars: ()
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60 nlocals: 1
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61 flags: 67
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62 consts: ('None',)
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63
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64 >>> def optimize_away():
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65 ... 'doc string'
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66 ... 'not a docstring'
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67 ... 53
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68 ... 53L
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69
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70 >>> dump(optimize_away.func_code)
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71 name: optimize_away
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72 argcount: 0
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73 names: ()
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74 varnames: ()
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75 cellvars: ()
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76 freevars: ()
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77 nlocals: 0
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78 flags: 67
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79 consts: ("'doc string'", 'None')
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80
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81 """
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82
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83 import unittest
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84 import weakref
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85 import _testcapi
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86
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87
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88 def consts(t):
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89 """Yield a doctest-safe sequence of object reprs."""
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90 for elt in t:
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91 r = repr(elt)
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92 if r.startswith("<code object"):
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93 yield "<code object %s>" % elt.co_name
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94 else:
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95 yield r
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96
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97 def dump(co):
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98 """Print out a text representation of a code object."""
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99 for attr in ["name", "argcount", "names", "varnames", "cellvars",
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100 "freevars", "nlocals", "flags"]:
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101 print "%s: %s" % (attr, getattr(co, "co_" + attr))
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102 print "consts:", tuple(consts(co.co_consts))
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103
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104
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105 class CodeTest(unittest.TestCase):
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106
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107 def test_newempty(self):
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108 co = _testcapi.code_newempty("filename", "funcname", 15)
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109 self.assertEqual(co.co_filename, "filename")
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110 self.assertEqual(co.co_name, "funcname")
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111 self.assertEqual(co.co_firstlineno, 15)
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112
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113
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114 class CodeWeakRefTest(unittest.TestCase):
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115
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116 def test_basic(self):
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117 # Create a code object in a clean environment so that we know we have
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118 # the only reference to it left.
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119 namespace = {}
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120 exec "def f(): pass" in globals(), namespace
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121 f = namespace["f"]
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122 del namespace
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123
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124 self.called = False
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125 def callback(code):
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126 self.called = True
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127
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128 # f is now the last reference to the function, and through it, the code
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129 # object. While we hold it, check that we can create a weakref and
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130 # deref it. Then delete it, and check that the callback gets called and
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131 # the reference dies.
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132 coderef = weakref.ref(f.__code__, callback)
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133 self.assertTrue(bool(coderef()))
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134 del f
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135 self.assertFalse(bool(coderef()))
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136 self.assertTrue(self.called)
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137
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138
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139 def test_main(verbose=None):
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140 from test.test_support import run_doctest, run_unittest
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141 from test import test_code
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142 run_doctest(test_code, verbose)
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143 run_unittest(CodeTest, CodeWeakRefTest)
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Brett Cannon <bcannon@gmail.com>
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145
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parents: 53930
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146 if __name__ == "__main__":
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147 test_main()