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1968ad32cd
- The copy module now "copies" function objects (as atomic objects).
- dict.__getitem__ now looks for a __missing__ hook before raising
KeyError.
- Added a new type, defaultdict, to the collections module.
This uses the new __missing__ hook behavior added to dict (see above).
135 lines
4.2 KiB
Python
135 lines
4.2 KiB
Python
"""Unit tests for collections.defaultdict."""
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import os
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import copy
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import tempfile
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import unittest
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from collections import defaultdict
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def foobar():
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return list
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class TestDefaultDict(unittest.TestCase):
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def test_basic(self):
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d1 = defaultdict()
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self.assertEqual(d1.default_factory, None)
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d1.default_factory = list
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d1[12].append(42)
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self.assertEqual(d1, {12: [42]})
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d1[12].append(24)
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self.assertEqual(d1, {12: [42, 24]})
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d1[13]
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d1[14]
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self.assertEqual(d1, {12: [42, 24], 13: [], 14: []})
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self.assert_(d1[12] is not d1[13] is not d1[14])
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d2 = defaultdict(list, foo=1, bar=2)
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self.assertEqual(d2.default_factory, list)
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self.assertEqual(d2, {"foo": 1, "bar": 2})
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self.assertEqual(d2["foo"], 1)
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self.assertEqual(d2["bar"], 2)
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self.assertEqual(d2[42], [])
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self.assert_("foo" in d2)
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self.assert_("foo" in d2.keys())
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self.assert_("bar" in d2)
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self.assert_("bar" in d2.keys())
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self.assert_(42 in d2)
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self.assert_(42 in d2.keys())
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self.assert_(12 not in d2)
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self.assert_(12 not in d2.keys())
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d2.default_factory = None
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self.assertEqual(d2.default_factory, None)
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try:
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d2[15]
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except KeyError, err:
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self.assertEqual(err.args, (15,))
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else:
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self.fail("d2[15] didn't raise KeyError")
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def test_missing(self):
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d1 = defaultdict()
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self.assertRaises(KeyError, d1.__missing__, 42)
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d1.default_factory = list
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self.assertEqual(d1.__missing__(42), [])
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def test_repr(self):
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d1 = defaultdict()
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self.assertEqual(d1.default_factory, None)
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self.assertEqual(repr(d1), "defaultdict(None, {})")
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d1[11] = 41
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self.assertEqual(repr(d1), "defaultdict(None, {11: 41})")
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d2 = defaultdict(0)
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self.assertEqual(d2.default_factory, 0)
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d2[12] = 42
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self.assertEqual(repr(d2), "defaultdict(0, {12: 42})")
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def foo(): return 43
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d3 = defaultdict(foo)
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self.assert_(d3.default_factory is foo)
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d3[13]
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self.assertEqual(repr(d3), "defaultdict(%s, {13: 43})" % repr(foo))
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def test_print(self):
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d1 = defaultdict()
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def foo(): return 42
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d2 = defaultdict(foo, {1: 2})
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# NOTE: We can't use tempfile.[Named]TemporaryFile since this
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# code must exercise the tp_print C code, which only gets
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# invoked for *real* files.
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tfn = tempfile.mktemp()
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try:
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f = open(tfn, "w+")
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try:
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print >>f, d1
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print >>f, d2
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f.seek(0)
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self.assertEqual(f.readline(), repr(d1) + "\n")
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self.assertEqual(f.readline(), repr(d2) + "\n")
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finally:
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f.close()
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finally:
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os.remove(tfn)
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def test_copy(self):
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d1 = defaultdict()
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d2 = d1.copy()
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self.assertEqual(type(d2), defaultdict)
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self.assertEqual(d2.default_factory, None)
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self.assertEqual(d2, {})
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d1.default_factory = list
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d3 = d1.copy()
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self.assertEqual(type(d3), defaultdict)
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self.assertEqual(d3.default_factory, list)
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self.assertEqual(d3, {})
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d1[42]
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d4 = d1.copy()
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self.assertEqual(type(d4), defaultdict)
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self.assertEqual(d4.default_factory, list)
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self.assertEqual(d4, {42: []})
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d4[12]
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self.assertEqual(d4, {42: [], 12: []})
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def test_shallow_copy(self):
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d1 = defaultdict(foobar, {1: 1})
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d2 = copy.copy(d1)
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self.assertEqual(d2.default_factory, foobar)
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self.assertEqual(d2, d1)
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d1.default_factory = list
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d2 = copy.copy(d1)
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self.assertEqual(d2.default_factory, list)
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self.assertEqual(d2, d1)
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def test_deep_copy(self):
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d1 = defaultdict(foobar, {1: [1]})
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d2 = copy.deepcopy(d1)
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self.assertEqual(d2.default_factory, foobar)
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self.assertEqual(d2, d1)
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self.assert_(d1[1] is not d2[1])
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d1.default_factory = list
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d2 = copy.deepcopy(d1)
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self.assertEqual(d2.default_factory, list)
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self.assertEqual(d2, d1)
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if __name__ == "__main__":
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unittest.main()
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