"""Unit tests for collections.defaultdict."""
import copy
import pickle
import unittest
from collections import defaultdict
def foobar():
return list
class TestDefaultDict(unittest.TestCase):
def test_basic(self):
d1 = defaultdict()
self.assertEqual(d1.default_factory, None)
d1.default_factory = list
d1[12].append(42)
self.assertEqual(d1, {12: [42]})
d1[12].append(24)
self.assertEqual(d1, {12: [42, 24]})
d1[13]
d1[14]
self.assertEqual(d1, {12: [42, 24], 13: [], 14: []})
self.assertTrue(d1[12] is not d1[13] is not d1[14])
d2 = defaultdict(list, foo=1, bar=2)
self.assertEqual(d2.default_factory, list)
self.assertEqual(d2, {"foo": 1, "bar": 2})
self.assertEqual(d2["foo"], 1)
self.assertEqual(d2["bar"], 2)
self.assertEqual(d2[42], [])
self.assertIn("foo", d2)
self.assertIn("foo", d2.keys())
self.assertIn("bar", d2)
self.assertIn("bar", d2.keys())
self.assertIn(42, d2)
self.assertIn(42, d2.keys())
self.assertNotIn(12, d2)
self.assertNotIn(12, d2.keys())
d2.default_factory = None
self.assertEqual(d2.default_factory, None)
try:
d2[15]
except KeyError as err:
self.assertEqual(err.args, (15,))
else:
self.fail("d2[15] didn't raise KeyError")
self.assertRaises(TypeError, defaultdict, 1)
def test_missing(self):
d1 = defaultdict()
self.assertRaises(KeyError, d1.__missing__, 42)
d1.default_factory = list
self.assertEqual(d1.__missing__(42), [])
def test_repr(self):
d1 = defaultdict()
self.assertEqual(d1.default_factory, None)
self.assertEqual(repr(d1), "defaultdict(None, {})")
self.assertEqual(eval(repr(d1)), d1)
d1[11] = 41
self.assertEqual(repr(d1), "defaultdict(None, {11: 41})")
d2 = defaultdict(int)
self.assertEqual(d2.default_factory, int)
d2[12] = 42
self.assertEqual(repr(d2), "defaultdict(<class 'int'>, {12: 42})")
def foo(): return 43
d3 = defaultdict(foo)
self.assertTrue(d3.default_factory is foo)
d3[13]
self.assertEqual(repr(d3), "defaultdict(%s, {13: 43})" % repr(foo))
def test_copy(self):
d1 = defaultdict()
d2 = d1.copy()
self.assertEqual(type(d2), defaultdict)
self.assertEqual(d2.default_factory, None)
self.assertEqual(d2, {})
d1.default_factory = list
d3 = d1.copy()
self.assertEqual(type(d3), defaultdict)
self.assertEqual(d3.default_factory, list)
self.assertEqual(d3, {})
d1[42]
d4 = d1.copy()
self.assertEqual(type(d4), defaultdict)
self.assertEqual(d4.default_factory, list)
self.assertEqual(d4, {42: []})
d4[12]
self.assertEqual(d4, {42: [], 12: []})
# Issue 6637: Copy fails for empty default dict
d = defaultdict()
d['a'] = 42
e = d.copy()
self.assertEqual(e['a'], 42)
def test_shallow_copy(self):
d1 = defaultdict(foobar, {1: 1})
d2 = copy.copy(d1)
self.assertEqual(d2.default_factory, foobar)
self.assertEqual(d2, d1)
d1.default_factory = list
d2 = copy.copy(d1)
self.assertEqual(d2.default_factory, list)
self.assertEqual(d2, d1)
def test_deep_copy(self):
d1 = defaultdict(foobar, {1: [1]})
d2 = copy.deepcopy(d1)
self.assertEqual(d2.default_factory, foobar)
self.assertEqual(d2, d1)
self.assertTrue(d1[1] is not d2[1])
d1.default_factory = list
d2 = copy.deepcopy(d1)
self.assertEqual(d2.default_factory, list)
self.assertEqual(d2, d1)
def test_keyerror_without_factory(self):
d1 = defaultdict()
try:
d1[(1,)]
except KeyError as err:
self.assertEqual(err.args[0], (1,))
else:
self.fail("expected KeyError")
def test_recursive_repr(self):
# Issue2045: stack overflow when default_factory is a bound method
class sub(defaultdict):
def __init__(self):
self.default_factory = self._factory
def _factory(self):
return []
d = sub()
self.assertRegex(repr(d),
r"sub\(<bound method .*sub\._factory "
r"of sub\(\.\.\., \{\}\)>, \{\}\)")
def test_callable_arg(self):
self.assertRaises(TypeError, defaultdict, {})
def test_pickling(self):
d = defaultdict(int)
d[1]
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
s = pickle.dumps(d, proto)
o = pickle.loads(s)
self.assertEqual(d, o)
def test_union(self):
i = defaultdict(int, {1: 1, 2: 2})
s = defaultdict(str, {0: "zero", 1: "one"})
i_s = i | s
self.assertIs(i_s.default_factory, int)
self.assertDictEqual(i_s, {1: "one", 2: 2, 0: "zero"})
self.assertEqual(list(i_s), [1, 2, 0])
s_i = s | i
self.assertIs(s_i.default_factory, str)
self.assertDictEqual(s_i, {0: "zero", 1: 1, 2: 2})
self.assertEqual(list(s_i), [0, 1, 2])
i_ds = i | dict(s)
self.assertIs(i_ds.default_factory, int)
self.assertDictEqual(i_ds, {1: "one", 2: 2, 0: "zero"})
self.assertEqual(list(i_ds), [1, 2, 0])
ds_i = dict(s) | i
self.assertIs(ds_i.default_factory, int)
self.assertDictEqual(ds_i, {0: "zero", 1: 1, 2: 2})
self.assertEqual(list(ds_i), [0, 1, 2])
with self.assertRaises(TypeError):
i | list(s.items())
with self.assertRaises(TypeError):
list(s.items()) | i
# We inherit a fine |= from dict, so just a few sanity checks here:
i |= list(s.items())
self.assertIs(i.default_factory, int)
self.assertDictEqual(i, {1: "one", 2: 2, 0: "zero"})
self.assertEqual(list(i), [1, 2, 0])
with self.assertRaises(TypeError):
i |= None
if __name__ == "__main__":
unittest.main()
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