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Backport PEP 372: OrderedDict()
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Raymond Hettinger
parent
7705d0aaaf
commit
bc512d3abd
4 changed files with 317 additions and 8 deletions
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@ -1,8 +1,11 @@
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import unittest, doctest
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import inspect
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from test import test_support
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from collections import namedtuple, Counter, Mapping
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from collections import namedtuple, Counter, OrderedDict
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from test import mapping_tests
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import pickle, cPickle, copy
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from random import randrange
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from random import randrange, shuffle
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import operator
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from collections import Hashable, Iterable, Iterator
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from collections import Sized, Container, Callable
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@ -567,12 +570,198 @@ class TestCounter(unittest.TestCase):
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set_result = setop(set(p.elements()), set(q.elements()))
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self.assertEqual(counter_result, dict.fromkeys(set_result, 1))
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class TestOrderedDict(unittest.TestCase):
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def test_init(self):
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with self.assertRaises(TypeError):
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OrderedDict([('a', 1), ('b', 2)], None) # too many args
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pairs = [('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5)]
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self.assertEqual(sorted(OrderedDict(dict(pairs)).items()), pairs) # dict input
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self.assertEqual(sorted(OrderedDict(**dict(pairs)).items()), pairs) # kwds input
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self.assertEqual(list(OrderedDict(pairs).items()), pairs) # pairs input
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self.assertEqual(list(OrderedDict([('a', 1), ('b', 2), ('c', 9), ('d', 4)],
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c=3, e=5).items()), pairs) # mixed input
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# make sure no positional args conflict with possible kwdargs
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self.assertEqual(inspect.getargspec(OrderedDict.__dict__['__init__']).args,
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['self'])
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# Make sure that direct calls to __init__ do not clear previous contents
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d = OrderedDict([('a', 1), ('b', 2), ('c', 3), ('d', 44), ('e', 55)])
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d.__init__([('e', 5), ('f', 6)], g=7, d=4)
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self.assertEqual(list(d.items()),
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[('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5), ('f', 6), ('g', 7)])
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def test_update(self):
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with self.assertRaises(TypeError):
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OrderedDict().update([('a', 1), ('b', 2)], None) # too many args
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pairs = [('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5)]
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od = OrderedDict()
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od.update(dict(pairs))
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self.assertEqual(sorted(od.items()), pairs) # dict input
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od = OrderedDict()
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od.update(**dict(pairs))
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self.assertEqual(sorted(od.items()), pairs) # kwds input
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od = OrderedDict()
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od.update(pairs)
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self.assertEqual(list(od.items()), pairs) # pairs input
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od = OrderedDict()
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od.update([('a', 1), ('b', 2), ('c', 9), ('d', 4)], c=3, e=5)
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self.assertEqual(list(od.items()), pairs) # mixed input
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# Make sure that direct calls to update do not clear previous contents
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# add that updates items are not moved to the end
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d = OrderedDict([('a', 1), ('b', 2), ('c', 3), ('d', 44), ('e', 55)])
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d.update([('e', 5), ('f', 6)], g=7, d=4)
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self.assertEqual(list(d.items()),
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[('a', 1), ('b', 2), ('c', 3), ('d', 4), ('e', 5), ('f', 6), ('g', 7)])
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def test_clear(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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shuffle(pairs)
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od = OrderedDict(pairs)
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self.assertEqual(len(od), len(pairs))
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od.clear()
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self.assertEqual(len(od), 0)
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def test_delitem(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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od = OrderedDict(pairs)
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del od['a']
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self.assert_('a' not in od)
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with self.assertRaises(KeyError):
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del od['a']
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self.assertEqual(list(od.items()), pairs[:2] + pairs[3:])
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def test_setitem(self):
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od = OrderedDict([('d', 1), ('b', 2), ('c', 3), ('a', 4), ('e', 5)])
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od['c'] = 10 # existing element
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od['f'] = 20 # new element
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self.assertEqual(list(od.items()),
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[('d', 1), ('b', 2), ('c', 10), ('a', 4), ('e', 5), ('f', 20)])
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def test_iterators(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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shuffle(pairs)
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od = OrderedDict(pairs)
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self.assertEqual(list(od), [t[0] for t in pairs])
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self.assertEqual(list(od.keys()), [t[0] for t in pairs])
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self.assertEqual(list(od.values()), [t[1] for t in pairs])
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self.assertEqual(list(od.items()), pairs)
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self.assertEqual(list(reversed(od)),
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[t[0] for t in reversed(pairs)])
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def test_popitem(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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shuffle(pairs)
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od = OrderedDict(pairs)
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while pairs:
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self.assertEqual(od.popitem(), pairs.pop())
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with self.assertRaises(KeyError):
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od.popitem()
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self.assertEqual(len(od), 0)
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def test_pop(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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shuffle(pairs)
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od = OrderedDict(pairs)
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shuffle(pairs)
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while pairs:
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k, v = pairs.pop()
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self.assertEqual(od.pop(k), v)
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with self.assertRaises(KeyError):
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od.pop('xyz')
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self.assertEqual(len(od), 0)
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self.assertEqual(od.pop(k, 12345), 12345)
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def test_equality(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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shuffle(pairs)
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od1 = OrderedDict(pairs)
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od2 = OrderedDict(pairs)
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self.assertEqual(od1, od2) # same order implies equality
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pairs = pairs[2:] + pairs[:2]
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od2 = OrderedDict(pairs)
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self.assertNotEqual(od1, od2) # different order implies inequality
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# comparison to regular dict is not order sensitive
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self.assertEqual(od1, dict(od2))
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self.assertEqual(dict(od2), od1)
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# different length implied inequality
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self.assertNotEqual(od1, OrderedDict(pairs[:-1]))
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def test_copying(self):
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# Check that ordered dicts are copyable, deepcopyable, picklable,
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# and have a repr/eval round-trip
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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od = OrderedDict(pairs)
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update_test = OrderedDict()
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update_test.update(od)
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for i, dup in enumerate([
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od.copy(),
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copy.copy(od),
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copy.deepcopy(od),
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pickle.loads(pickle.dumps(od, 0)),
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pickle.loads(pickle.dumps(od, 1)),
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pickle.loads(pickle.dumps(od, 2)),
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pickle.loads(pickle.dumps(od, -1)),
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eval(repr(od)),
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update_test,
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OrderedDict(od),
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]):
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self.assert_(dup is not od)
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self.assertEquals(dup, od)
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self.assertEquals(list(dup.items()), list(od.items()))
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self.assertEquals(len(dup), len(od))
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self.assertEquals(type(dup), type(od))
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def test_repr(self):
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od = OrderedDict([('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)])
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self.assertEqual(repr(od),
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"OrderedDict([('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)])")
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self.assertEqual(eval(repr(od)), od)
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self.assertEqual(repr(OrderedDict()), "OrderedDict()")
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def test_setdefault(self):
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pairs = [('c', 1), ('b', 2), ('a', 3), ('d', 4), ('e', 5), ('f', 6)]
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shuffle(pairs)
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od = OrderedDict(pairs)
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pair_order = list(od.items())
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self.assertEqual(od.setdefault('a', 10), 3)
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# make sure order didn't change
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self.assertEqual(list(od.items()), pair_order)
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self.assertEqual(od.setdefault('x', 10), 10)
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# make sure 'x' is added to the end
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self.assertEqual(list(od.items())[-1], ('x', 10))
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def test_reinsert(self):
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# Given insert a, insert b, delete a, re-insert a,
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# verify that a is now later than b.
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od = OrderedDict()
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od['a'] = 1
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od['b'] = 2
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del od['a']
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od['a'] = 1
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self.assertEqual(list(od.items()), [('b', 2), ('a', 1)])
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class GeneralMappingTests(mapping_tests.BasicTestMappingProtocol):
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type2test = OrderedDict
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class MyOrderedDict(OrderedDict):
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pass
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class SubclassMappingTests(mapping_tests.BasicTestMappingProtocol):
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type2test = MyOrderedDict
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import doctest, collections
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def test_main(verbose=None):
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NamedTupleDocs = doctest.DocTestSuite(module=collections)
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test_classes = [TestNamedTuple, NamedTupleDocs, TestOneTrickPonyABCs,
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TestCollectionABCs, TestCounter]
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TestCollectionABCs, TestCounter,
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TestOrderedDict, GeneralMappingTests, SubclassMappingTests]
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test_support.run_unittest(*test_classes)
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test_support.run_doctest(collections, verbose)
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