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226 lines
7.2 KiB
226 lines
7.2 KiB
"""Unit tests for collections.defaultdict."""
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import os
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import copy
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import pickle
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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.assertTrue(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.assertIn("foo", d2)
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self.assertIn("foo", d2.keys())
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self.assertIn("bar", d2)
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self.assertIn("bar", d2.keys())
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self.assertIn(42, d2)
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self.assertIn(42, d2.keys())
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self.assertNotIn(12, d2)
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self.assertNotIn(12, 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 as 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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self.assertRaises(TypeError, defaultdict, 1)
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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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self.assertEqual(eval(repr(d1)), d1)
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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(int)
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self.assertEqual(d2.default_factory, int)
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d2[12] = 42
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self.assertEqual(repr(d2), "defaultdict(<class 'int'>, {12: 42})")
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def foo(): return 43
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d3 = defaultdict(foo)
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self.assertTrue(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(d1, file=f)
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print(d2, file=f)
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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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# Issue 6637: Copy fails for empty default dict
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d = defaultdict()
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d['a'] = 42
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e = d.copy()
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self.assertEqual(e['a'], 42)
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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.assertTrue(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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def test_keyerror_without_factory(self):
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d1 = defaultdict()
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try:
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d1[(1,)]
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except KeyError as err:
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self.assertEqual(err.args[0], (1,))
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else:
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self.fail("expected KeyError")
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def test_recursive_repr(self):
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# Issue2045: stack overflow when default_factory is a bound method
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class sub(defaultdict):
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def __init__(self):
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self.default_factory = self._factory
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def _factory(self):
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return []
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d = sub()
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self.assertRegex(repr(d),
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r"sub\(<bound method .*sub\._factory "
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r"of sub\(\.\.\., \{\}\)>, \{\}\)")
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# NOTE: printing a subclass of a builtin type does not call its
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# tp_print slot. So this part is essentially the same test as above.
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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(d, file=f)
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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_callable_arg(self):
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self.assertRaises(TypeError, defaultdict, {})
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def test_pickling(self):
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d = defaultdict(int)
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d[1]
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for proto in range(pickle.HIGHEST_PROTOCOL + 1):
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s = pickle.dumps(d, proto)
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o = pickle.loads(s)
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self.assertEqual(d, o)
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def test_union(self):
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i = defaultdict(int, {1: 1, 2: 2})
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s = defaultdict(str, {0: "zero", 1: "one"})
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i_s = i | s
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self.assertIs(i_s.default_factory, int)
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self.assertDictEqual(i_s, {1: "one", 2: 2, 0: "zero"})
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self.assertEqual(list(i_s), [1, 2, 0])
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s_i = s | i
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self.assertIs(s_i.default_factory, str)
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self.assertDictEqual(s_i, {0: "zero", 1: 1, 2: 2})
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self.assertEqual(list(s_i), [0, 1, 2])
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i_ds = i | dict(s)
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self.assertIs(i_ds.default_factory, int)
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self.assertDictEqual(i_ds, {1: "one", 2: 2, 0: "zero"})
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self.assertEqual(list(i_ds), [1, 2, 0])
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ds_i = dict(s) | i
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self.assertIs(ds_i.default_factory, int)
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self.assertDictEqual(ds_i, {0: "zero", 1: 1, 2: 2})
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self.assertEqual(list(ds_i), [0, 1, 2])
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with self.assertRaises(TypeError):
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i | list(s.items())
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with self.assertRaises(TypeError):
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list(s.items()) | i
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# We inherit a fine |= from dict, so just a few sanity checks here:
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i |= list(s.items())
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self.assertIs(i.default_factory, int)
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self.assertDictEqual(i, {1: "one", 2: 2, 0: "zero"})
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self.assertEqual(list(i), [1, 2, 0])
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with self.assertRaises(TypeError):
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i |= None
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if __name__ == "__main__":
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unittest.main()
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