909 lines
28 KiB
Python
909 lines
28 KiB
Python
# Test iterators.
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import unittest
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from test.test_support import run_unittest, TESTFN, unlink, have_unicode
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# Test result of triple loop (too big to inline)
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TRIPLETS = [(0, 0, 0), (0, 0, 1), (0, 0, 2),
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(0, 1, 0), (0, 1, 1), (0, 1, 2),
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(0, 2, 0), (0, 2, 1), (0, 2, 2),
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(1, 0, 0), (1, 0, 1), (1, 0, 2),
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(1, 1, 0), (1, 1, 1), (1, 1, 2),
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(1, 2, 0), (1, 2, 1), (1, 2, 2),
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(2, 0, 0), (2, 0, 1), (2, 0, 2),
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(2, 1, 0), (2, 1, 1), (2, 1, 2),
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(2, 2, 0), (2, 2, 1), (2, 2, 2)]
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# Helper classes
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class BasicIterClass:
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def __init__(self, n):
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self.n = n
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self.i = 0
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def next(self):
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res = self.i
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if res >= self.n:
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raise StopIteration
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self.i = res + 1
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return res
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class IteratingSequenceClass:
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def __init__(self, n):
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self.n = n
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def __iter__(self):
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return BasicIterClass(self.n)
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class SequenceClass:
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def __init__(self, n):
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self.n = n
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def __getitem__(self, i):
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if 0 <= i < self.n:
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return i
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else:
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raise IndexError
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# Main test suite
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class TestCase(unittest.TestCase):
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# Helper to check that an iterator returns a given sequence
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def check_iterator(self, it, seq):
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res = []
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while 1:
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try:
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val = it.next()
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except StopIteration:
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break
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res.append(val)
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self.assertEqual(res, seq)
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# Helper to check that a for loop generates a given sequence
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def check_for_loop(self, expr, seq):
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res = []
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for val in expr:
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res.append(val)
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self.assertEqual(res, seq)
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# Test basic use of iter() function
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def test_iter_basic(self):
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self.check_iterator(iter(range(10)), range(10))
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# Test that iter(iter(x)) is the same as iter(x)
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def test_iter_idempotency(self):
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seq = range(10)
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it = iter(seq)
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it2 = iter(it)
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self.assertTrue(it is it2)
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# Test that for loops over iterators work
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def test_iter_for_loop(self):
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self.check_for_loop(iter(range(10)), range(10))
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# Test several independent iterators over the same list
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def test_iter_independence(self):
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seq = range(3)
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res = []
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for i in iter(seq):
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for j in iter(seq):
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for k in iter(seq):
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res.append((i, j, k))
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self.assertEqual(res, TRIPLETS)
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# Test triple list comprehension using iterators
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def test_nested_comprehensions_iter(self):
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seq = range(3)
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res = [(i, j, k)
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for i in iter(seq) for j in iter(seq) for k in iter(seq)]
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self.assertEqual(res, TRIPLETS)
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# Test triple list comprehension without iterators
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def test_nested_comprehensions_for(self):
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seq = range(3)
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res = [(i, j, k) for i in seq for j in seq for k in seq]
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self.assertEqual(res, TRIPLETS)
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# Test a class with __iter__ in a for loop
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def test_iter_class_for(self):
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self.check_for_loop(IteratingSequenceClass(10), range(10))
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# Test a class with __iter__ with explicit iter()
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def test_iter_class_iter(self):
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self.check_iterator(iter(IteratingSequenceClass(10)), range(10))
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# Test for loop on a sequence class without __iter__
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def test_seq_class_for(self):
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self.check_for_loop(SequenceClass(10), range(10))
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# Test iter() on a sequence class without __iter__
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def test_seq_class_iter(self):
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self.check_iterator(iter(SequenceClass(10)), range(10))
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# Test a new_style class with __iter__ but no next() method
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def test_new_style_iter_class(self):
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class IterClass(object):
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def __iter__(self):
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return self
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self.assertRaises(TypeError, iter, IterClass())
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# Test two-argument iter() with callable instance
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def test_iter_callable(self):
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class C:
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def __init__(self):
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self.i = 0
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def __call__(self):
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i = self.i
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self.i = i + 1
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if i > 100:
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raise IndexError # Emergency stop
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return i
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self.check_iterator(iter(C(), 10), range(10))
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# Test two-argument iter() with function
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def test_iter_function(self):
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def spam(state=[0]):
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i = state[0]
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state[0] = i+1
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return i
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self.check_iterator(iter(spam, 10), range(10))
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# Test two-argument iter() with function that raises StopIteration
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def test_iter_function_stop(self):
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def spam(state=[0]):
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i = state[0]
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if i == 10:
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raise StopIteration
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state[0] = i+1
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return i
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self.check_iterator(iter(spam, 20), range(10))
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# Test exception propagation through function iterator
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def test_exception_function(self):
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def spam(state=[0]):
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i = state[0]
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state[0] = i+1
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if i == 10:
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raise RuntimeError
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return i
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res = []
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try:
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for x in iter(spam, 20):
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res.append(x)
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except RuntimeError:
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self.assertEqual(res, range(10))
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else:
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self.fail("should have raised RuntimeError")
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# Test exception propagation through sequence iterator
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def test_exception_sequence(self):
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class MySequenceClass(SequenceClass):
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def __getitem__(self, i):
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if i == 10:
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raise RuntimeError
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return SequenceClass.__getitem__(self, i)
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res = []
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try:
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for x in MySequenceClass(20):
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res.append(x)
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except RuntimeError:
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self.assertEqual(res, range(10))
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else:
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self.fail("should have raised RuntimeError")
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# Test for StopIteration from __getitem__
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def test_stop_sequence(self):
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class MySequenceClass(SequenceClass):
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def __getitem__(self, i):
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if i == 10:
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raise StopIteration
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return SequenceClass.__getitem__(self, i)
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self.check_for_loop(MySequenceClass(20), range(10))
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# Test a big range
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def test_iter_big_range(self):
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self.check_for_loop(iter(range(10000)), range(10000))
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# Test an empty list
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def test_iter_empty(self):
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self.check_for_loop(iter([]), [])
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# Test a tuple
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def test_iter_tuple(self):
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self.check_for_loop(iter((0,1,2,3,4,5,6,7,8,9)), range(10))
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# Test an xrange
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def test_iter_xrange(self):
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self.check_for_loop(iter(xrange(10)), range(10))
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# Test a string
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def test_iter_string(self):
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self.check_for_loop(iter("abcde"), ["a", "b", "c", "d", "e"])
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# Test a Unicode string
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if have_unicode:
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def test_iter_unicode(self):
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self.check_for_loop(iter(unicode("abcde")),
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[unicode("a"), unicode("b"), unicode("c"),
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unicode("d"), unicode("e")])
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# Test a directory
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def test_iter_dict(self):
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dict = {}
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for i in range(10):
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dict[i] = None
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self.check_for_loop(dict, dict.keys())
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# Test a file
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def test_iter_file(self):
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f = open(TESTFN, "w")
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try:
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for i in range(5):
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f.write("%d\n" % i)
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finally:
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f.close()
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f = open(TESTFN, "r")
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try:
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self.check_for_loop(f, ["0\n", "1\n", "2\n", "3\n", "4\n"])
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self.check_for_loop(f, [])
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finally:
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f.close()
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try:
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unlink(TESTFN)
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except OSError:
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pass
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# Test list()'s use of iterators.
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def test_builtin_list(self):
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self.assertEqual(list(SequenceClass(5)), range(5))
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self.assertEqual(list(SequenceClass(0)), [])
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self.assertEqual(list(()), [])
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self.assertEqual(list(range(10, -1, -1)), range(10, -1, -1))
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d = {"one": 1, "two": 2, "three": 3}
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self.assertEqual(list(d), d.keys())
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self.assertRaises(TypeError, list, list)
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self.assertRaises(TypeError, list, 42)
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f = open(TESTFN, "w")
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try:
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for i in range(5):
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f.write("%d\n" % i)
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finally:
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f.close()
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f = open(TESTFN, "r")
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try:
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self.assertEqual(list(f), ["0\n", "1\n", "2\n", "3\n", "4\n"])
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f.seek(0, 0)
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self.assertEqual(list(f),
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["0\n", "1\n", "2\n", "3\n", "4\n"])
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finally:
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f.close()
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try:
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unlink(TESTFN)
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except OSError:
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pass
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# Test tuples()'s use of iterators.
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def test_builtin_tuple(self):
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self.assertEqual(tuple(SequenceClass(5)), (0, 1, 2, 3, 4))
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self.assertEqual(tuple(SequenceClass(0)), ())
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self.assertEqual(tuple([]), ())
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self.assertEqual(tuple(()), ())
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self.assertEqual(tuple("abc"), ("a", "b", "c"))
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d = {"one": 1, "two": 2, "three": 3}
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self.assertEqual(tuple(d), tuple(d.keys()))
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self.assertRaises(TypeError, tuple, list)
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self.assertRaises(TypeError, tuple, 42)
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f = open(TESTFN, "w")
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try:
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for i in range(5):
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f.write("%d\n" % i)
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finally:
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f.close()
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f = open(TESTFN, "r")
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try:
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self.assertEqual(tuple(f), ("0\n", "1\n", "2\n", "3\n", "4\n"))
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f.seek(0, 0)
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self.assertEqual(tuple(f),
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("0\n", "1\n", "2\n", "3\n", "4\n"))
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finally:
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f.close()
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try:
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unlink(TESTFN)
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except OSError:
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pass
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# Test filter()'s use of iterators.
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def test_builtin_filter(self):
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self.assertEqual(filter(None, SequenceClass(5)), range(1, 5))
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self.assertEqual(filter(None, SequenceClass(0)), [])
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self.assertEqual(filter(None, ()), ())
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self.assertEqual(filter(None, "abc"), "abc")
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d = {"one": 1, "two": 2, "three": 3}
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self.assertEqual(filter(None, d), d.keys())
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self.assertRaises(TypeError, filter, None, list)
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self.assertRaises(TypeError, filter, None, 42)
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class Boolean:
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def __init__(self, truth):
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self.truth = truth
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def __nonzero__(self):
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return self.truth
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bTrue = Boolean(1)
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bFalse = Boolean(0)
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class Seq:
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def __init__(self, *args):
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self.vals = args
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def __iter__(self):
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class SeqIter:
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def __init__(self, vals):
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self.vals = vals
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self.i = 0
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def __iter__(self):
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return self
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def next(self):
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i = self.i
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self.i = i + 1
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if i < len(self.vals):
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return self.vals[i]
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else:
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raise StopIteration
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return SeqIter(self.vals)
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seq = Seq(*([bTrue, bFalse] * 25))
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self.assertEqual(filter(lambda x: not x, seq), [bFalse]*25)
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self.assertEqual(filter(lambda x: not x, iter(seq)), [bFalse]*25)
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# Test max() and min()'s use of iterators.
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def test_builtin_max_min(self):
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self.assertEqual(max(SequenceClass(5)), 4)
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self.assertEqual(min(SequenceClass(5)), 0)
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self.assertEqual(max(8, -1), 8)
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self.assertEqual(min(8, -1), -1)
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d = {"one": 1, "two": 2, "three": 3}
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self.assertEqual(max(d), "two")
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self.assertEqual(min(d), "one")
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self.assertEqual(max(d.itervalues()), 3)
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self.assertEqual(min(iter(d.itervalues())), 1)
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f = open(TESTFN, "w")
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try:
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f.write("medium line\n")
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f.write("xtra large line\n")
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f.write("itty-bitty line\n")
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finally:
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f.close()
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f = open(TESTFN, "r")
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try:
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self.assertEqual(min(f), "itty-bitty line\n")
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f.seek(0, 0)
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self.assertEqual(max(f), "xtra large line\n")
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finally:
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f.close()
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try:
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unlink(TESTFN)
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except OSError:
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pass
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# Test map()'s use of iterators.
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def test_builtin_map(self):
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self.assertEqual(map(None, SequenceClass(5)), range(5))
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self.assertEqual(map(lambda x: x+1, SequenceClass(5)), range(1, 6))
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d = {"one": 1, "two": 2, "three": 3}
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self.assertEqual(map(None, d), d.keys())
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self.assertEqual(map(lambda k, d=d: (k, d[k]), d), d.items())
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dkeys = d.keys()
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expected = [(i < len(d) and dkeys[i] or None,
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i,
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i < len(d) and dkeys[i] or None)
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for i in range(5)]
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self.assertEqual(map(None, d,
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SequenceClass(5),
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iter(d.iterkeys())),
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expected)
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f = open(TESTFN, "w")
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try:
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for i in range(10):
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f.write("xy" * i + "\n") # line i has len 2*i+1
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finally:
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f.close()
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f = open(TESTFN, "r")
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try:
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self.assertEqual(map(len, f), range(1, 21, 2))
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finally:
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f.close()
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try:
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unlink(TESTFN)
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except OSError:
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pass
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# Test zip()'s use of iterators.
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def test_builtin_zip(self):
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self.assertEqual(zip(), [])
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self.assertEqual(zip(*[]), [])
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self.assertEqual(zip(*[(1, 2), 'ab']), [(1, 'a'), (2, 'b')])
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self.assertRaises(TypeError, zip, None)
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self.assertRaises(TypeError, zip, range(10), 42)
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self.assertRaises(TypeError, zip, range(10), zip)
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self.assertEqual(zip(IteratingSequenceClass(3)),
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[(0,), (1,), (2,)])
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self.assertEqual(zip(SequenceClass(3)),
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[(0,), (1,), (2,)])
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d = {"one": 1, "two": 2, "three": 3}
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self.assertEqual(d.items(), zip(d, d.itervalues()))
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# Generate all ints starting at constructor arg.
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class IntsFrom:
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def __init__(self, start):
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self.i = start
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def __iter__(self):
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return self
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def next(self):
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i = self.i
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self.i = i+1
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return i
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f = open(TESTFN, "w")
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try:
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f.write("a\n" "bbb\n" "cc\n")
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finally:
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f.close()
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f = open(TESTFN, "r")
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try:
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self.assertEqual(zip(IntsFrom(0), f, IntsFrom(-100)),
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[(0, "a\n", -100),
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(1, "bbb\n", -99),
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(2, "cc\n", -98)])
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finally:
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f.close()
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try:
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unlink(TESTFN)
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except OSError:
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pass
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self.assertEqual(zip(xrange(5)), [(i,) for i in range(5)])
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# Classes that lie about their lengths.
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class NoGuessLen5:
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def __getitem__(self, i):
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if i >= 5:
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raise IndexError
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return i
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class Guess3Len5(NoGuessLen5):
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def __len__(self):
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return 3
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class Guess30Len5(NoGuessLen5):
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def __len__(self):
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return 30
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self.assertEqual(len(Guess3Len5()), 3)
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self.assertEqual(len(Guess30Len5()), 30)
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self.assertEqual(zip(NoGuessLen5()), zip(range(5)))
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self.assertEqual(zip(Guess3Len5()), zip(range(5)))
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self.assertEqual(zip(Guess30Len5()), zip(range(5)))
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expected = [(i, i) for i in range(5)]
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for x in NoGuessLen5(), Guess3Len5(), Guess30Len5():
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for y in NoGuessLen5(), Guess3Len5(), Guess30Len5():
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self.assertEqual(zip(x, y), expected)
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# Test reduces()'s use of iterators.
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def test_builtin_reduce(self):
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from operator import add
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self.assertEqual(reduce(add, SequenceClass(5)), 10)
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self.assertEqual(reduce(add, SequenceClass(5), 42), 52)
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self.assertRaises(TypeError, reduce, add, SequenceClass(0))
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self.assertEqual(reduce(add, SequenceClass(0), 42), 42)
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self.assertEqual(reduce(add, SequenceClass(1)), 0)
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self.assertEqual(reduce(add, SequenceClass(1), 42), 42)
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d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(reduce(add, d), "".join(d.keys()))
|
|
|
|
# This test case will be removed if we don't have Unicode
|
|
def test_unicode_join_endcase(self):
|
|
|
|
# This class inserts a Unicode object into its argument's natural
|
|
# iteration, in the 3rd position.
|
|
class OhPhooey:
|
|
def __init__(self, seq):
|
|
self.it = iter(seq)
|
|
self.i = 0
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def next(self):
|
|
i = self.i
|
|
self.i = i+1
|
|
if i == 2:
|
|
return unicode("fooled you!")
|
|
return self.it.next()
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" + "b\n" + "c\n")
|
|
finally:
|
|
f.close()
|
|
|
|
f = open(TESTFN, "r")
|
|
# Nasty: string.join(s) can't know whether unicode.join() is needed
|
|
# until it's seen all of s's elements. But in this case, f's
|
|
# iterator cannot be restarted. So what we're testing here is
|
|
# whether string.join() can manage to remember everything it's seen
|
|
# and pass that on to unicode.join().
|
|
try:
|
|
got = " - ".join(OhPhooey(f))
|
|
self.assertEqual(got, unicode("a\n - b\n - fooled you! - c\n"))
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
if not have_unicode:
|
|
def test_unicode_join_endcase(self): pass
|
|
|
|
# Test iterators with 'x in y' and 'x not in y'.
|
|
def test_in_and_not_in(self):
|
|
for sc5 in IteratingSequenceClass(5), SequenceClass(5):
|
|
for i in range(5):
|
|
self.assertIn(i, sc5)
|
|
for i in "abc", -1, 5, 42.42, (3, 4), [], {1: 1}, 3-12j, sc5:
|
|
self.assertNotIn(i, sc5)
|
|
|
|
self.assertRaises(TypeError, lambda: 3 in 12)
|
|
self.assertRaises(TypeError, lambda: 3 not in map)
|
|
|
|
d = {"one": 1, "two": 2, "three": 3, 1j: 2j}
|
|
for k in d:
|
|
self.assertIn(k, d)
|
|
self.assertNotIn(k, d.itervalues())
|
|
for v in d.values():
|
|
self.assertIn(v, d.itervalues())
|
|
self.assertNotIn(v, d)
|
|
for k, v in d.iteritems():
|
|
self.assertIn((k, v), d.iteritems())
|
|
self.assertNotIn((v, k), d.iteritems())
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "b\n" "c\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
for chunk in "abc":
|
|
f.seek(0, 0)
|
|
self.assertNotIn(chunk, f)
|
|
f.seek(0, 0)
|
|
self.assertIn((chunk + "\n"), f)
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test iterators with operator.countOf (PySequence_Count).
|
|
def test_countOf(self):
|
|
from operator import countOf
|
|
self.assertEqual(countOf([1,2,2,3,2,5], 2), 3)
|
|
self.assertEqual(countOf((1,2,2,3,2,5), 2), 3)
|
|
self.assertEqual(countOf("122325", "2"), 3)
|
|
self.assertEqual(countOf("122325", "6"), 0)
|
|
|
|
self.assertRaises(TypeError, countOf, 42, 1)
|
|
self.assertRaises(TypeError, countOf, countOf, countOf)
|
|
|
|
d = {"one": 3, "two": 3, "three": 3, 1j: 2j}
|
|
for k in d:
|
|
self.assertEqual(countOf(d, k), 1)
|
|
self.assertEqual(countOf(d.itervalues(), 3), 3)
|
|
self.assertEqual(countOf(d.itervalues(), 2j), 1)
|
|
self.assertEqual(countOf(d.itervalues(), 1j), 0)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "b\n" "c\n" "b\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
for letter, count in ("a", 1), ("b", 2), ("c", 1), ("d", 0):
|
|
f.seek(0, 0)
|
|
self.assertEqual(countOf(f, letter + "\n"), count)
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
# Test iterators with operator.indexOf (PySequence_Index).
|
|
def test_indexOf(self):
|
|
from operator import indexOf
|
|
self.assertEqual(indexOf([1,2,2,3,2,5], 1), 0)
|
|
self.assertEqual(indexOf((1,2,2,3,2,5), 2), 1)
|
|
self.assertEqual(indexOf((1,2,2,3,2,5), 3), 3)
|
|
self.assertEqual(indexOf((1,2,2,3,2,5), 5), 5)
|
|
self.assertRaises(ValueError, indexOf, (1,2,2,3,2,5), 0)
|
|
self.assertRaises(ValueError, indexOf, (1,2,2,3,2,5), 6)
|
|
|
|
self.assertEqual(indexOf("122325", "2"), 1)
|
|
self.assertEqual(indexOf("122325", "5"), 5)
|
|
self.assertRaises(ValueError, indexOf, "122325", "6")
|
|
|
|
self.assertRaises(TypeError, indexOf, 42, 1)
|
|
self.assertRaises(TypeError, indexOf, indexOf, indexOf)
|
|
|
|
f = open(TESTFN, "w")
|
|
try:
|
|
f.write("a\n" "b\n" "c\n" "d\n" "e\n")
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
fiter = iter(f)
|
|
self.assertEqual(indexOf(fiter, "b\n"), 1)
|
|
self.assertEqual(indexOf(fiter, "d\n"), 1)
|
|
self.assertEqual(indexOf(fiter, "e\n"), 0)
|
|
self.assertRaises(ValueError, indexOf, fiter, "a\n")
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
iclass = IteratingSequenceClass(3)
|
|
for i in range(3):
|
|
self.assertEqual(indexOf(iclass, i), i)
|
|
self.assertRaises(ValueError, indexOf, iclass, -1)
|
|
|
|
# Test iterators with file.writelines().
|
|
def test_writelines(self):
|
|
f = file(TESTFN, "w")
|
|
|
|
try:
|
|
self.assertRaises(TypeError, f.writelines, None)
|
|
self.assertRaises(TypeError, f.writelines, 42)
|
|
|
|
f.writelines(["1\n", "2\n"])
|
|
f.writelines(("3\n", "4\n"))
|
|
f.writelines({'5\n': None})
|
|
f.writelines({})
|
|
|
|
# Try a big chunk too.
|
|
class Iterator:
|
|
def __init__(self, start, finish):
|
|
self.start = start
|
|
self.finish = finish
|
|
self.i = self.start
|
|
|
|
def next(self):
|
|
if self.i >= self.finish:
|
|
raise StopIteration
|
|
result = str(self.i) + '\n'
|
|
self.i += 1
|
|
return result
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
class Whatever:
|
|
def __init__(self, start, finish):
|
|
self.start = start
|
|
self.finish = finish
|
|
|
|
def __iter__(self):
|
|
return Iterator(self.start, self.finish)
|
|
|
|
f.writelines(Whatever(6, 6+2000))
|
|
f.close()
|
|
|
|
f = file(TESTFN)
|
|
expected = [str(i) + "\n" for i in range(1, 2006)]
|
|
self.assertEqual(list(f), expected)
|
|
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
|
|
# Test iterators on RHS of unpacking assignments.
|
|
def test_unpack_iter(self):
|
|
a, b = 1, 2
|
|
self.assertEqual((a, b), (1, 2))
|
|
|
|
a, b, c = IteratingSequenceClass(3)
|
|
self.assertEqual((a, b, c), (0, 1, 2))
|
|
|
|
try: # too many values
|
|
a, b = IteratingSequenceClass(3)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
self.fail("should have raised ValueError")
|
|
|
|
try: # not enough values
|
|
a, b, c = IteratingSequenceClass(2)
|
|
except ValueError:
|
|
pass
|
|
else:
|
|
self.fail("should have raised ValueError")
|
|
|
|
try: # not iterable
|
|
a, b, c = len
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail("should have raised TypeError")
|
|
|
|
a, b, c = {1: 42, 2: 42, 3: 42}.itervalues()
|
|
self.assertEqual((a, b, c), (42, 42, 42))
|
|
|
|
f = open(TESTFN, "w")
|
|
lines = ("a\n", "bb\n", "ccc\n")
|
|
try:
|
|
for line in lines:
|
|
f.write(line)
|
|
finally:
|
|
f.close()
|
|
f = open(TESTFN, "r")
|
|
try:
|
|
a, b, c = f
|
|
self.assertEqual((a, b, c), lines)
|
|
finally:
|
|
f.close()
|
|
try:
|
|
unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
(a, b), (c,) = IteratingSequenceClass(2), {42: 24}
|
|
self.assertEqual((a, b, c), (0, 1, 42))
|
|
|
|
# Test reference count behavior
|
|
|
|
class C(object):
|
|
count = 0
|
|
def __new__(cls):
|
|
cls.count += 1
|
|
return object.__new__(cls)
|
|
def __del__(self):
|
|
cls = self.__class__
|
|
assert cls.count > 0
|
|
cls.count -= 1
|
|
x = C()
|
|
self.assertEqual(C.count, 1)
|
|
del x
|
|
self.assertEqual(C.count, 0)
|
|
l = [C(), C(), C()]
|
|
self.assertEqual(C.count, 3)
|
|
try:
|
|
a, b = iter(l)
|
|
except ValueError:
|
|
pass
|
|
del l
|
|
self.assertEqual(C.count, 0)
|
|
|
|
|
|
# Make sure StopIteration is a "sink state".
|
|
# This tests various things that weren't sink states in Python 2.2.1,
|
|
# plus various things that always were fine.
|
|
|
|
def test_sinkstate_list(self):
|
|
# This used to fail
|
|
a = range(5)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
a.extend(range(5, 10))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_tuple(self):
|
|
a = (0, 1, 2, 3, 4)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_string(self):
|
|
a = "abcde"
|
|
b = iter(a)
|
|
self.assertEqual(list(b), ['a', 'b', 'c', 'd', 'e'])
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_sequence(self):
|
|
# This used to fail
|
|
a = SequenceClass(5)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
a.n = 10
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_callable(self):
|
|
# This used to fail
|
|
def spam(state=[0]):
|
|
i = state[0]
|
|
state[0] = i+1
|
|
if i == 10:
|
|
raise AssertionError, "shouldn't have gotten this far"
|
|
return i
|
|
b = iter(spam, 5)
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_dict(self):
|
|
# XXX For a more thorough test, see towards the end of:
|
|
# http://mail.python.org/pipermail/python-dev/2002-July/026512.html
|
|
a = {1:1, 2:2, 0:0, 4:4, 3:3}
|
|
for b in iter(a), a.iterkeys(), a.iteritems(), a.itervalues():
|
|
b = iter(a)
|
|
self.assertEqual(len(list(b)), 5)
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_yield(self):
|
|
def gen():
|
|
for i in range(5):
|
|
yield i
|
|
b = gen()
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_range(self):
|
|
a = xrange(5)
|
|
b = iter(a)
|
|
self.assertEqual(list(b), range(5))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_sinkstate_enumerate(self):
|
|
a = range(5)
|
|
e = enumerate(a)
|
|
b = iter(e)
|
|
self.assertEqual(list(b), zip(range(5), range(5)))
|
|
self.assertEqual(list(b), [])
|
|
|
|
def test_3720(self):
|
|
# Avoid a crash, when an iterator deletes its next() method.
|
|
class BadIterator(object):
|
|
def __iter__(self):
|
|
return self
|
|
def next(self):
|
|
del BadIterator.next
|
|
return 1
|
|
|
|
try:
|
|
for i in BadIterator() :
|
|
pass
|
|
except TypeError:
|
|
pass
|
|
|
|
|
|
def test_main():
|
|
run_unittest(TestCase)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|