- Patch 1433928:
- 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).
diff --git a/Lib/test/test_defaultdict.py b/Lib/test/test_defaultdict.py
new file mode 100644
index 0000000..b5a6628
--- /dev/null
+++ b/Lib/test/test_defaultdict.py
@@ -0,0 +1,135 @@
+"""Unit tests for collections.defaultdict."""
+
+import os
+import copy
+import tempfile
+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.assert_(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.assert_("foo" in d2)
+ self.assert_("foo" in d2.keys())
+ self.assert_("bar" in d2)
+ self.assert_("bar" in d2.keys())
+ self.assert_(42 in d2)
+ self.assert_(42 in d2.keys())
+ self.assert_(12 not in d2)
+ self.assert_(12 not in d2.keys())
+ d2.default_factory = None
+ self.assertEqual(d2.default_factory, None)
+ try:
+ d2[15]
+ except KeyError, err:
+ self.assertEqual(err.args, (15,))
+ else:
+ self.fail("d2[15] didn't raise KeyError")
+
+ 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, {})")
+ d1[11] = 41
+ self.assertEqual(repr(d1), "defaultdict(None, {11: 41})")
+ d2 = defaultdict(0)
+ self.assertEqual(d2.default_factory, 0)
+ d2[12] = 42
+ self.assertEqual(repr(d2), "defaultdict(0, {12: 42})")
+ def foo(): return 43
+ d3 = defaultdict(foo)
+ self.assert_(d3.default_factory is foo)
+ d3[13]
+ self.assertEqual(repr(d3), "defaultdict(%s, {13: 43})" % repr(foo))
+
+ def test_print(self):
+ d1 = defaultdict()
+ def foo(): return 42
+ d2 = defaultdict(foo, {1: 2})
+ # NOTE: We can't use tempfile.[Named]TemporaryFile since this
+ # code must exercise the tp_print C code, which only gets
+ # invoked for *real* files.
+ tfn = tempfile.mktemp()
+ try:
+ f = open(tfn, "w+")
+ try:
+ print >>f, d1
+ print >>f, d2
+ f.seek(0)
+ self.assertEqual(f.readline(), repr(d1) + "\n")
+ self.assertEqual(f.readline(), repr(d2) + "\n")
+ finally:
+ f.close()
+ finally:
+ os.remove(tfn)
+
+ 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: []})
+
+ 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.assert_(d1[1] is not d2[1])
+ d1.default_factory = list
+ d2 = copy.deepcopy(d1)
+ self.assertEqual(d2.default_factory, list)
+ self.assertEqual(d2, d1)
+
+
+if __name__ == "__main__":
+ unittest.main()