| 1 | from test import test_support
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| 2 | import types
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| 3 | import unittest
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| 4 |
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| 5 | class FuncAttrsTest(unittest.TestCase):
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| 6 | def setUp(self):
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| 7 | class F:
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| 8 | def a(self):
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| 9 | pass
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| 10 | def b():
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| 11 | return 3
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| 12 | self.f = F
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| 13 | self.fi = F()
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| 14 | self.b = b
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| 15 |
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| 16 | def cannot_set_attr(self, obj, name, value, exceptions):
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| 17 | # Helper method for other tests.
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| 18 | try:
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| 19 | setattr(obj, name, value)
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| 20 | except exceptions:
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| 21 | pass
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| 22 | else:
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| 23 | self.fail("shouldn't be able to set %s to %r" % (name, value))
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| 24 | try:
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| 25 | delattr(obj, name)
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| 26 | except exceptions:
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| 27 | pass
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| 28 | else:
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| 29 | self.fail("shouldn't be able to del %s" % name)
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| 30 |
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| 31 |
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| 32 | class FunctionPropertiesTest(FuncAttrsTest):
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| 33 | # Include the external setUp method that is common to all tests
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| 34 | def test_module(self):
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| 35 | self.assertEqual(self.b.__module__, __name__)
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| 36 |
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| 37 | def test_dir_includes_correct_attrs(self):
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| 38 | self.b.known_attr = 7
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| 39 | self.assertIn('known_attr', dir(self.b),
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| 40 | "set attributes not in dir listing of method")
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| 41 | # Test on underlying function object of method
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| 42 | self.f.a.im_func.known_attr = 7
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| 43 | self.assertIn('known_attr', dir(self.f.a),
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| 44 | "set attribute on unbound method implementation in "
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| 45 | "class not in dir")
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| 46 | self.assertIn('known_attr', dir(self.fi.a),
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| 47 | "set attribute on unbound method implementations, "
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| 48 | "should show up in next dir")
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| 49 |
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| 50 | def test_duplicate_function_equality(self):
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| 51 | # Body of `duplicate' is the exact same as self.b
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| 52 | def duplicate():
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| 53 | 'my docstring'
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| 54 | return 3
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| 55 | self.assertNotEqual(self.b, duplicate)
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| 56 |
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| 57 | def test_copying_func_code(self):
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| 58 | def test(): pass
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| 59 | self.assertEqual(test(), None)
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| 60 | test.func_code = self.b.func_code
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| 61 | self.assertEqual(test(), 3) # self.b always returns 3, arbitrarily
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| 62 |
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| 63 | def test_func_globals(self):
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| 64 | self.assertIs(self.b.func_globals, globals())
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| 65 | self.cannot_set_attr(self.b, 'func_globals', 2, TypeError)
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| 66 |
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| 67 | def test_func_closure(self):
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| 68 | a = 12
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| 69 | def f(): print a
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| 70 | c = f.func_closure
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| 71 | self.assertIsInstance(c, tuple)
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| 72 | self.assertEqual(len(c), 1)
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| 73 | # don't have a type object handy
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| 74 | self.assertEqual(c[0].__class__.__name__, "cell")
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| 75 | self.cannot_set_attr(f, "func_closure", c, TypeError)
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| 76 |
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| 77 | def test_empty_cell(self):
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| 78 | def f(): print a
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| 79 | try:
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| 80 | f.func_closure[0].cell_contents
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| 81 | except ValueError:
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| 82 | pass
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| 83 | else:
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| 84 | self.fail("shouldn't be able to read an empty cell")
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| 85 | a = 12
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| 86 |
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| 87 | def test_func_name(self):
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| 88 | self.assertEqual(self.b.__name__, 'b')
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| 89 | self.assertEqual(self.b.func_name, 'b')
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| 90 | self.b.__name__ = 'c'
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| 91 | self.assertEqual(self.b.__name__, 'c')
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| 92 | self.assertEqual(self.b.func_name, 'c')
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| 93 | self.b.func_name = 'd'
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| 94 | self.assertEqual(self.b.__name__, 'd')
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| 95 | self.assertEqual(self.b.func_name, 'd')
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| 96 | # __name__ and func_name must be a string
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| 97 | self.cannot_set_attr(self.b, '__name__', 7, TypeError)
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| 98 | self.cannot_set_attr(self.b, 'func_name', 7, TypeError)
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| 99 | # __name__ must be available when in restricted mode. Exec will raise
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| 100 | # AttributeError if __name__ is not available on f.
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| 101 | s = """def f(): pass\nf.__name__"""
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| 102 | exec s in {'__builtins__': {}}
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| 103 | # Test on methods, too
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| 104 | self.assertEqual(self.f.a.__name__, 'a')
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| 105 | self.assertEqual(self.fi.a.__name__, 'a')
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| 106 | self.cannot_set_attr(self.f.a, "__name__", 'a', AttributeError)
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| 107 | self.cannot_set_attr(self.fi.a, "__name__", 'a', AttributeError)
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| 108 |
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| 109 | def test_func_code(self):
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| 110 | num_one, num_two = 7, 8
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| 111 | def a(): pass
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| 112 | def b(): return 12
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| 113 | def c(): return num_one
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| 114 | def d(): return num_two
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| 115 | def e(): return num_one, num_two
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| 116 | for func in [a, b, c, d, e]:
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| 117 | self.assertEqual(type(func.func_code), types.CodeType)
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| 118 | self.assertEqual(c(), 7)
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| 119 | self.assertEqual(d(), 8)
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| 120 | d.func_code = c.func_code
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| 121 | self.assertEqual(c.func_code, d.func_code)
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| 122 | self.assertEqual(c(), 7)
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| 123 | # self.assertEqual(d(), 7)
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| 124 | try:
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| 125 | b.func_code = c.func_code
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| 126 | except ValueError:
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| 127 | pass
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| 128 | else:
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| 129 | self.fail("func_code with different numbers of free vars should "
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| 130 | "not be possible")
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| 131 | try:
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| 132 | e.func_code = d.func_code
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| 133 | except ValueError:
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| 134 | pass
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| 135 | else:
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| 136 | self.fail("func_code with different numbers of free vars should "
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| 137 | "not be possible")
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| 138 |
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| 139 | def test_blank_func_defaults(self):
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| 140 | self.assertEqual(self.b.func_defaults, None)
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| 141 | del self.b.func_defaults
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| 142 | self.assertEqual(self.b.func_defaults, None)
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| 143 |
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| 144 | def test_func_default_args(self):
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| 145 | def first_func(a, b):
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| 146 | return a+b
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| 147 | def second_func(a=1, b=2):
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| 148 | return a+b
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| 149 | self.assertEqual(first_func.func_defaults, None)
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| 150 | self.assertEqual(second_func.func_defaults, (1, 2))
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| 151 | first_func.func_defaults = (1, 2)
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| 152 | self.assertEqual(first_func.func_defaults, (1, 2))
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| 153 | self.assertEqual(first_func(), 3)
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| 154 | self.assertEqual(first_func(3), 5)
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| 155 | self.assertEqual(first_func(3, 5), 8)
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| 156 | del second_func.func_defaults
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| 157 | self.assertEqual(second_func.func_defaults, None)
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| 158 | try:
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| 159 | second_func()
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| 160 | except TypeError:
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| 161 | pass
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| 162 | else:
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| 163 | self.fail("func_defaults does not update; deleting it does not "
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| 164 | "remove requirement")
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| 165 |
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| 166 |
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| 167 | class InstancemethodAttrTest(FuncAttrsTest):
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| 168 | def test_im_class(self):
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| 169 | self.assertEqual(self.f.a.im_class, self.f)
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| 170 | self.assertEqual(self.fi.a.im_class, self.f)
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| 171 | self.cannot_set_attr(self.f.a, "im_class", self.f, TypeError)
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| 172 | self.cannot_set_attr(self.fi.a, "im_class", self.f, TypeError)
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| 173 |
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| 174 | def test_im_func(self):
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| 175 | self.f.b = self.b
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| 176 | self.assertEqual(self.f.b.im_func, self.b)
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| 177 | self.assertEqual(self.fi.b.im_func, self.b)
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| 178 | self.cannot_set_attr(self.f.b, "im_func", self.b, TypeError)
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| 179 | self.cannot_set_attr(self.fi.b, "im_func", self.b, TypeError)
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| 180 |
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| 181 | def test_im_self(self):
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| 182 | self.assertEqual(self.f.a.im_self, None)
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| 183 | self.assertEqual(self.fi.a.im_self, self.fi)
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| 184 | self.cannot_set_attr(self.f.a, "im_self", None, TypeError)
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| 185 | self.cannot_set_attr(self.fi.a, "im_self", self.fi, TypeError)
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| 186 |
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| 187 | def test_im_func_non_method(self):
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| 188 | # Behavior should be the same when a method is added via an attr
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| 189 | # assignment
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| 190 | self.f.id = types.MethodType(id, None, self.f)
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| 191 | self.assertEqual(self.fi.id(), id(self.fi))
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| 192 | self.assertNotEqual(self.fi.id(), id(self.f))
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| 193 | # Test usage
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| 194 | try:
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| 195 | self.f.id.unknown_attr
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| 196 | except AttributeError:
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| 197 | pass
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| 198 | else:
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| 199 | self.fail("using unknown attributes should raise AttributeError")
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| 200 | # Test assignment and deletion
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| 201 | self.cannot_set_attr(self.f.id, 'unknown_attr', 2, AttributeError)
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| 202 | self.cannot_set_attr(self.fi.id, 'unknown_attr', 2, AttributeError)
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| 203 |
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| 204 | def test_implicit_method_properties(self):
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| 205 | self.f.a.im_func.known_attr = 7
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| 206 | self.assertEqual(self.f.a.known_attr, 7)
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| 207 | self.assertEqual(self.fi.a.known_attr, 7)
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| 208 |
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| 209 |
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| 210 | class ArbitraryFunctionAttrTest(FuncAttrsTest):
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| 211 | def test_set_attr(self):
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| 212 | # setting attributes only works on function objects
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| 213 | self.b.known_attr = 7
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| 214 | self.assertEqual(self.b.known_attr, 7)
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| 215 | for func in [self.f.a, self.fi.a]:
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| 216 | try:
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| 217 | func.known_attr = 7
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| 218 | except AttributeError:
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| 219 | pass
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| 220 | else:
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| 221 | self.fail("setting attributes on methods should raise error")
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| 222 |
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| 223 | def test_delete_unknown_attr(self):
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| 224 | try:
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| 225 | del self.b.unknown_attr
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| 226 | except AttributeError:
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| 227 | pass
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| 228 | else:
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| 229 | self.fail("deleting unknown attribute should raise TypeError")
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| 230 |
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| 231 | def test_setting_attrs_duplicates(self):
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| 232 | try:
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| 233 | self.f.a.klass = self.f
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| 234 | except AttributeError:
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| 235 | pass
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| 236 | else:
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| 237 | self.fail("setting arbitrary attribute in unbound function "
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| 238 | " should raise AttributeError")
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| 239 | self.f.a.im_func.klass = self.f
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| 240 | for method in [self.f.a, self.fi.a, self.fi.a.im_func]:
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| 241 | self.assertEqual(method.klass, self.f)
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| 242 |
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| 243 | def test_unset_attr(self):
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| 244 | for func in [self.b, self.f.a, self.fi.a]:
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| 245 | try:
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| 246 | func.non_existent_attr
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| 247 | except AttributeError:
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| 248 | pass
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| 249 | else:
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| 250 | self.fail("using unknown attributes should raise "
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| 251 | "AttributeError")
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| 252 |
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| 253 |
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| 254 | class FunctionDictsTest(FuncAttrsTest):
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| 255 | def test_setting_dict_to_invalid(self):
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| 256 | self.cannot_set_attr(self.b, '__dict__', None, TypeError)
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| 257 | self.cannot_set_attr(self.b, 'func_dict', None, TypeError)
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| 258 | from UserDict import UserDict
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| 259 | d = UserDict({'known_attr': 7})
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| 260 | self.cannot_set_attr(self.f.a.im_func, '__dict__', d, TypeError)
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| 261 | self.cannot_set_attr(self.fi.a.im_func, '__dict__', d, TypeError)
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| 262 |
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| 263 | def test_setting_dict_to_valid(self):
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| 264 | d = {'known_attr': 7}
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| 265 | self.b.__dict__ = d
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| 266 | # Setting dict is only possible on the underlying function objects
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| 267 | self.f.a.im_func.__dict__ = d
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| 268 | # Test assignment
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| 269 | self.assertIs(d, self.b.__dict__)
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| 270 | self.assertIs(d, self.b.func_dict)
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| 271 | # ... and on all the different ways of referencing the method's func
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| 272 | self.assertIs(d, self.f.a.im_func.__dict__)
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| 273 | self.assertIs(d, self.f.a.__dict__)
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| 274 | self.assertIs(d, self.fi.a.im_func.__dict__)
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| 275 | self.assertIs(d, self.fi.a.__dict__)
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| 276 | # Test value
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| 277 | self.assertEqual(self.b.known_attr, 7)
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| 278 | self.assertEqual(self.b.__dict__['known_attr'], 7)
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| 279 | self.assertEqual(self.b.func_dict['known_attr'], 7)
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| 280 | # ... and again, on all the different method's names
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| 281 | self.assertEqual(self.f.a.im_func.known_attr, 7)
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| 282 | self.assertEqual(self.f.a.known_attr, 7)
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| 283 | self.assertEqual(self.fi.a.im_func.known_attr, 7)
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| 284 | self.assertEqual(self.fi.a.known_attr, 7)
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| 285 |
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| 286 | def test_delete_func_dict(self):
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| 287 | try:
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| 288 | del self.b.__dict__
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| 289 | except TypeError:
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| 290 | pass
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| 291 | else:
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| 292 | self.fail("deleting function dictionary should raise TypeError")
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| 293 | try:
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| 294 | del self.b.func_dict
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| 295 | except TypeError:
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| 296 | pass
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| 297 | else:
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| 298 | self.fail("deleting function dictionary should raise TypeError")
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| 299 |
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| 300 | def test_unassigned_dict(self):
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| 301 | self.assertEqual(self.b.__dict__, {})
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| 302 |
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| 303 | def test_func_as_dict_key(self):
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| 304 | value = "Some string"
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| 305 | d = {}
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| 306 | d[self.b] = value
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| 307 | self.assertEqual(d[self.b], value)
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| 308 |
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| 309 |
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| 310 | class FunctionDocstringTest(FuncAttrsTest):
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| 311 | def test_set_docstring_attr(self):
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| 312 | self.assertEqual(self.b.__doc__, None)
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| 313 | self.assertEqual(self.b.func_doc, None)
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| 314 | docstr = "A test method that does nothing"
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| 315 | self.b.__doc__ = self.f.a.im_func.__doc__ = docstr
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| 316 | self.assertEqual(self.b.__doc__, docstr)
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| 317 | self.assertEqual(self.b.func_doc, docstr)
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| 318 | self.assertEqual(self.f.a.__doc__, docstr)
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| 319 | self.assertEqual(self.fi.a.__doc__, docstr)
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| 320 | self.cannot_set_attr(self.f.a, "__doc__", docstr, AttributeError)
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| 321 | self.cannot_set_attr(self.fi.a, "__doc__", docstr, AttributeError)
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| 322 |
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| 323 | def test_delete_docstring(self):
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| 324 | self.b.__doc__ = "The docstring"
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| 325 | del self.b.__doc__
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| 326 | self.assertEqual(self.b.__doc__, None)
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| 327 | self.assertEqual(self.b.func_doc, None)
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| 328 | self.b.func_doc = "The docstring"
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| 329 | del self.b.func_doc
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| 330 | self.assertEqual(self.b.__doc__, None)
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| 331 | self.assertEqual(self.b.func_doc, None)
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| 332 |
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| 333 |
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| 334 | class StaticMethodAttrsTest(unittest.TestCase):
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| 335 | def test_func_attribute(self):
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| 336 | def f():
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| 337 | pass
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| 338 |
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| 339 | c = classmethod(f)
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| 340 | self.assertTrue(c.__func__ is f)
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| 341 |
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| 342 | s = staticmethod(f)
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| 343 | self.assertTrue(s.__func__ is f)
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| 344 |
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| 345 |
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| 346 | def test_main():
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| 347 | test_support.run_unittest(FunctionPropertiesTest, InstancemethodAttrTest,
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| 348 | ArbitraryFunctionAttrTest, FunctionDictsTest,
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| 349 | FunctionDocstringTest,
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| 350 | StaticMethodAttrsTest)
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| 351 |
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| 352 | if __name__ == "__main__":
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| 353 | test_main()
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