| # Test iterators. | |
| import unittest | |
| from test.test_support import run_unittest, TESTFN, unlink, have_unicode, \ | |
| check_py3k_warnings, cpython_only | |
| # Test result of triple loop (too big to inline) | |
| TRIPLETS = [(0, 0, 0), (0, 0, 1), (0, 0, 2), | |
| (0, 1, 0), (0, 1, 1), (0, 1, 2), | |
| (0, 2, 0), (0, 2, 1), (0, 2, 2), | |
| (1, 0, 0), (1, 0, 1), (1, 0, 2), | |
| (1, 1, 0), (1, 1, 1), (1, 1, 2), | |
| (1, 2, 0), (1, 2, 1), (1, 2, 2), | |
| (2, 0, 0), (2, 0, 1), (2, 0, 2), | |
| (2, 1, 0), (2, 1, 1), (2, 1, 2), | |
| (2, 2, 0), (2, 2, 1), (2, 2, 2)] | |
| # Helper classes | |
| class BasicIterClass: | |
| def __init__(self, n): | |
| self.n = n | |
| self.i = 0 | |
| def next(self): | |
| res = self.i | |
| if res >= self.n: | |
| raise StopIteration | |
| self.i = res + 1 | |
| return res | |
| class IteratingSequenceClass: | |
| def __init__(self, n): | |
| self.n = n | |
| def __iter__(self): | |
| return BasicIterClass(self.n) | |
| class SequenceClass: | |
| def __init__(self, n): | |
| self.n = n | |
| def __getitem__(self, i): | |
| if 0 <= i < self.n: | |
| return i | |
| else: | |
| raise IndexError | |
| # Main test suite | |
| class TestCase(unittest.TestCase): | |
| # Helper to check that an iterator returns a given sequence | |
| def check_iterator(self, it, seq): | |
| res = [] | |
| while 1: | |
| try: | |
| val = it.next() | |
| except StopIteration: | |
| break | |
| res.append(val) | |
| self.assertEqual(res, seq) | |
| # Helper to check that a for loop generates a given sequence | |
| def check_for_loop(self, expr, seq): | |
| res = [] | |
| for val in expr: | |
| res.append(val) | |
| self.assertEqual(res, seq) | |
| # Test basic use of iter() function | |
| def test_iter_basic(self): | |
| self.check_iterator(iter(range(10)), range(10)) | |
| # Test that iter(iter(x)) is the same as iter(x) | |
| def test_iter_idempotency(self): | |
| seq = range(10) | |
| it = iter(seq) | |
| it2 = iter(it) | |
| self.assertTrue(it is it2) | |
| # Test that for loops over iterators work | |
| def test_iter_for_loop(self): | |
| self.check_for_loop(iter(range(10)), range(10)) | |
| # Test several independent iterators over the same list | |
| def test_iter_independence(self): | |
| seq = range(3) | |
| res = [] | |
| for i in iter(seq): | |
| for j in iter(seq): | |
| for k in iter(seq): | |
| res.append((i, j, k)) | |
| self.assertEqual(res, TRIPLETS) | |
| # Test triple list comprehension using iterators | |
| def test_nested_comprehensions_iter(self): | |
| seq = range(3) | |
| res = [(i, j, k) | |
| for i in iter(seq) for j in iter(seq) for k in iter(seq)] | |
| self.assertEqual(res, TRIPLETS) | |
| # Test triple list comprehension without iterators | |
| def test_nested_comprehensions_for(self): | |
| seq = range(3) | |
| res = [(i, j, k) for i in seq for j in seq for k in seq] | |
| self.assertEqual(res, TRIPLETS) | |
| # Test a class with __iter__ in a for loop | |
| def test_iter_class_for(self): | |
| self.check_for_loop(IteratingSequenceClass(10), range(10)) | |
| # Test a class with __iter__ with explicit iter() | |
| def test_iter_class_iter(self): | |
| self.check_iterator(iter(IteratingSequenceClass(10)), range(10)) | |
| # Test for loop on a sequence class without __iter__ | |
| def test_seq_class_for(self): | |
| self.check_for_loop(SequenceClass(10), range(10)) | |
| # Test iter() on a sequence class without __iter__ | |
| def test_seq_class_iter(self): | |
| self.check_iterator(iter(SequenceClass(10)), range(10)) | |
| # Test a new_style class with __iter__ but no next() method | |
| def test_new_style_iter_class(self): | |
| class IterClass(object): | |
| def __iter__(self): | |
| return self | |
| self.assertRaises(TypeError, iter, IterClass()) | |
| # Test two-argument iter() with callable instance | |
| def test_iter_callable(self): | |
| class C: | |
| def __init__(self): | |
| self.i = 0 | |
| def __call__(self): | |
| i = self.i | |
| self.i = i + 1 | |
| if i > 100: | |
| raise IndexError # Emergency stop | |
| return i | |
| self.check_iterator(iter(C(), 10), range(10)) | |
| # Test two-argument iter() with function | |
| def test_iter_function(self): | |
| def spam(state=[0]): | |
| i = state[0] | |
| state[0] = i+1 | |
| return i | |
| self.check_iterator(iter(spam, 10), range(10)) | |
| # Test two-argument iter() with function that raises StopIteration | |
| def test_iter_function_stop(self): | |
| def spam(state=[0]): | |
| i = state[0] | |
| if i == 10: | |
| raise StopIteration | |
| state[0] = i+1 | |
| return i | |
| self.check_iterator(iter(spam, 20), range(10)) | |
| # Test exception propagation through function iterator | |
| def test_exception_function(self): | |
| def spam(state=[0]): | |
| i = state[0] | |
| state[0] = i+1 | |
| if i == 10: | |
| raise RuntimeError | |
| return i | |
| res = [] | |
| try: | |
| for x in iter(spam, 20): | |
| res.append(x) | |
| except RuntimeError: | |
| self.assertEqual(res, range(10)) | |
| else: | |
| self.fail("should have raised RuntimeError") | |
| # Test exception propagation through sequence iterator | |
| def test_exception_sequence(self): | |
| class MySequenceClass(SequenceClass): | |
| def __getitem__(self, i): | |
| if i == 10: | |
| raise RuntimeError | |
| return SequenceClass.__getitem__(self, i) | |
| res = [] | |
| try: | |
| for x in MySequenceClass(20): | |
| res.append(x) | |
| except RuntimeError: | |
| self.assertEqual(res, range(10)) | |
| else: | |
| self.fail("should have raised RuntimeError") | |
| # Test for StopIteration from __getitem__ | |
| def test_stop_sequence(self): | |
| class MySequenceClass(SequenceClass): | |
| def __getitem__(self, i): | |
| if i == 10: | |
| raise StopIteration | |
| return SequenceClass.__getitem__(self, i) | |
| self.check_for_loop(MySequenceClass(20), range(10)) | |
| # Test a big range | |
| def test_iter_big_range(self): | |
| self.check_for_loop(iter(range(10000)), range(10000)) | |
| # Test an empty list | |
| def test_iter_empty(self): | |
| self.check_for_loop(iter([]), []) | |
| # Test a tuple | |
| def test_iter_tuple(self): | |
| self.check_for_loop(iter((0,1,2,3,4,5,6,7,8,9)), range(10)) | |
| # Test an xrange | |
| def test_iter_xrange(self): | |
| self.check_for_loop(iter(xrange(10)), range(10)) | |
| # Test a string | |
| def test_iter_string(self): | |
| self.check_for_loop(iter("abcde"), ["a", "b", "c", "d", "e"]) | |
| # Test a Unicode string | |
| if have_unicode: | |
| def test_iter_unicode(self): | |
| self.check_for_loop(iter(unicode("abcde")), | |
| [unicode("a"), unicode("b"), unicode("c"), | |
| unicode("d"), unicode("e")]) | |
| # Test a directory | |
| def test_iter_dict(self): | |
| dict = {} | |
| for i in range(10): | |
| dict[i] = None | |
| self.check_for_loop(dict, dict.keys()) | |
| # Test a file | |
| def test_iter_file(self): | |
| f = open(TESTFN, "w") | |
| try: | |
| for i in range(5): | |
| f.write("%d\n" % i) | |
| finally: | |
| f.close() | |
| f = open(TESTFN, "r") | |
| try: | |
| self.check_for_loop(f, ["0\n", "1\n", "2\n", "3\n", "4\n"]) | |
| self.check_for_loop(f, []) | |
| finally: | |
| f.close() | |
| try: | |
| unlink(TESTFN) | |
| except OSError: | |
| pass | |
| # Test list()'s use of iterators. | |
| def test_builtin_list(self): | |
| self.assertEqual(list(SequenceClass(5)), range(5)) | |
| self.assertEqual(list(SequenceClass(0)), []) | |
| self.assertEqual(list(()), []) | |
| self.assertEqual(list(range(10, -1, -1)), range(10, -1, -1)) | |
| d = {"one": 1, "two": 2, "three": 3} | |
| self.assertEqual(list(d), d.keys()) | |
| self.assertRaises(TypeError, list, list) | |
| self.assertRaises(TypeError, list, 42) | |
| f = open(TESTFN, "w") | |
| try: | |
| for i in range(5): | |
| f.write("%d\n" % i) | |
| finally: | |
| f.close() | |
| f = open(TESTFN, "r") | |
| try: | |
| self.assertEqual(list(f), ["0\n", "1\n", "2\n", "3\n", "4\n"]) | |
| f.seek(0, 0) | |
| self.assertEqual(list(f), | |
| ["0\n", "1\n", "2\n", "3\n", "4\n"]) | |
| finally: | |
| f.close() | |
| try: | |
| unlink(TESTFN) | |
| except OSError: | |
| pass | |
| # Test tuples()'s use of iterators. | |
| def test_builtin_tuple(self): | |
| self.assertEqual(tuple(SequenceClass(5)), (0, 1, 2, 3, 4)) | |
| self.assertEqual(tuple(SequenceClass(0)), ()) | |
| self.assertEqual(tuple([]), ()) | |
| self.assertEqual(tuple(()), ()) | |
| self.assertEqual(tuple("abc"), ("a", "b", "c")) | |
| d = {"one": 1, "two": 2, "three": 3} | |
| self.assertEqual(tuple(d), tuple(d.keys())) | |
| self.assertRaises(TypeError, tuple, list) | |
| self.assertRaises(TypeError, tuple, 42) | |
| f = open(TESTFN, "w") | |
| try: | |
| for i in range(5): | |
| f.write("%d\n" % i) | |
| finally: | |
| f.close() | |
| f = open(TESTFN, "r") | |
| try: | |
| self.assertEqual(tuple(f), ("0\n", "1\n", "2\n", "3\n", "4\n")) | |
| f.seek(0, 0) | |
| self.assertEqual(tuple(f), | |
| ("0\n", "1\n", "2\n", "3\n", "4\n")) | |
| finally: | |
| f.close() | |
| try: | |
| unlink(TESTFN) | |
| except OSError: | |
| pass | |
| # Test filter()'s use of iterators. | |
| def test_builtin_filter(self): | |
| self.assertEqual(filter(None, SequenceClass(5)), range(1, 5)) | |
| self.assertEqual(filter(None, SequenceClass(0)), []) | |
| self.assertEqual(filter(None, ()), ()) | |
| self.assertEqual(filter(None, "abc"), "abc") | |
| d = {"one": 1, "two": 2, "three": 3} | |
| self.assertEqual(filter(None, d), d.keys()) | |
| self.assertRaises(TypeError, filter, None, list) | |
| self.assertRaises(TypeError, filter, None, 42) | |
| class Boolean: | |
| def __init__(self, truth): | |
| self.truth = truth | |
| def __nonzero__(self): | |
| return self.truth | |
| bTrue = Boolean(1) | |
| bFalse = Boolean(0) | |
| class Seq: | |
| def __init__(self, *args): | |
| self.vals = args | |
| def __iter__(self): | |
| class SeqIter: | |
| def __init__(self, vals): | |
| self.vals = vals | |
| self.i = 0 | |
| def __iter__(self): | |
| return self | |
| def next(self): | |
| i = self.i | |
| self.i = i + 1 | |
| if i < len(self.vals): | |
| return self.vals[i] | |
| else: | |
| raise StopIteration | |
| return SeqIter(self.vals) | |
| seq = Seq(*([bTrue, bFalse] * 25)) | |
| self.assertEqual(filter(lambda x: not x, seq), [bFalse]*25) | |
| self.assertEqual(filter(lambda x: not x, iter(seq)), [bFalse]*25) | |
| # Test max() and min()'s use of iterators. | |
| def test_builtin_max_min(self): | |
| self.assertEqual(max(SequenceClass(5)), 4) | |
| self.assertEqual(min(SequenceClass(5)), 0) | |
| self.assertEqual(max(8, -1), 8) | |
| self.assertEqual(min(8, -1), -1) | |
| d = {"one": 1, "two": 2, "three": 3} | |
| self.assertEqual(max(d), "two") | |
| self.assertEqual(min(d), "one") | |
| self.assertEqual(max(d.itervalues()), 3) | |
| self.assertEqual(min(iter(d.itervalues())), 1) | |
| f = open(TESTFN, "w") | |
| try: | |
| f.write("medium line\n") | |
| f.write("xtra large line\n") | |
| f.write("itty-bitty line\n") | |
| finally: | |
| f.close() | |
| f = open(TESTFN, "r") | |
| try: | |
| self.assertEqual(min(f), "itty-bitty line\n") | |
| f.seek(0, 0) | |
| self.assertEqual(max(f), "xtra large line\n") | |
| finally: | |
| f.close() | |
| try: | |
| unlink(TESTFN) | |
| except OSError: | |
| pass | |
| # Test map()'s use of iterators. | |
| def test_builtin_map(self): | |
| self.assertEqual(map(lambda x: x+1, SequenceClass(5)), range(1, 6)) | |
| d = {"one": 1, "two": 2, "three": 3} | |
| self.assertEqual(map(lambda k, d=d: (k, d[k]), d), d.items()) | |
| dkeys = d.keys() | |
| expected = [(i < len(d) and dkeys[i] or None, | |
| i, | |
| i < len(d) and dkeys[i] or None) | |
| for i in range(5)] | |
| # Deprecated map(None, ...) | |
| with check_py3k_warnings(): | |
| self.assertEqual(map(None, SequenceClass(5)), range(5)) | |
| self.assertEqual(map(None, d), d.keys()) | |
| self.assertEqual(map(None, d, | |
| SequenceClass(5), | |
| iter(d.iterkeys())), | |
| expected) | |
| f = open(TESTFN, "w") | |
| try: | |
| for i in range(10): | |
| f.write("xy" * i + "\n") # line i has len 2*i+1 | |
| finally: | |
| f.close() | |
| f = open(TESTFN, "r") | |
| try: | |
| self.assertEqual(map(len, f), range(1, 21, 2)) | |
| finally: | |
| f.close() | |
| try: | |
| unlink(TESTFN) | |
| except OSError: | |
| pass | |
| # Test zip()'s use of iterators. | |
| def test_builtin_zip(self): | |
| self.assertEqual(zip(), []) | |
| self.assertEqual(zip(*[]), []) | |
| self.assertEqual(zip(*[(1, 2), 'ab']), [(1, 'a'), (2, 'b')]) | |
| self.assertRaises(TypeError, zip, None) | |
| self.assertRaises(TypeError, zip, range(10), 42) | |
| self.assertRaises(TypeError, zip, range(10), zip) | |
| self.assertEqual(zip(IteratingSequenceClass(3)), | |
| [(0,), (1,), (2,)]) | |
| self.assertEqual(zip(SequenceClass(3)), | |
| [(0,), (1,), (2,)]) | |
| d = {"one": 1, "two": 2, "three": 3} | |
| self.assertEqual(d.items(), zip(d, d.itervalues())) | |
| # Generate all ints starting at constructor arg. | |
| class IntsFrom: | |
| def __init__(self, start): | |
| self.i = start | |
| def __iter__(self): | |
| return self | |
| def next(self): | |
| i = self.i | |
| self.i = i+1 | |
| return i | |
| f = open(TESTFN, "w") | |
| try: | |
| f.write("a\n" "bbb\n" "cc\n") | |
| finally: | |
| f.close() | |
| f = open(TESTFN, "r") | |
| try: | |
| self.assertEqual(zip(IntsFrom(0), f, IntsFrom(-100)), | |
| [(0, "a\n", -100), | |
| (1, "bbb\n", -99), | |
| (2, "cc\n", -98)]) | |
| finally: | |
| f.close() | |
| try: | |
| unlink(TESTFN) | |
| except OSError: | |
| pass | |
| self.assertEqual(zip(xrange(5)), [(i,) for i in range(5)]) | |
| # Classes that lie about their lengths. | |
| class NoGuessLen5: | |
| def __getitem__(self, i): | |
| if i >= 5: | |
| raise IndexError | |
| return i | |
| class Guess3Len5(NoGuessLen5): | |
| def __len__(self): | |
| return 3 | |
| class Guess30Len5(NoGuessLen5): | |
| def __len__(self): | |
| return 30 | |
| self.assertEqual(len(Guess3Len5()), 3) | |
| self.assertEqual(len(Guess30Len5()), 30) | |
| self.assertEqual(zip(NoGuessLen5()), zip(range(5))) | |
| self.assertEqual(zip(Guess3Len5()), zip(range(5))) | |
| self.assertEqual(zip(Guess30Len5()), zip(range(5))) | |
| expected = [(i, i) for i in range(5)] | |
| for x in NoGuessLen5(), Guess3Len5(), Guess30Len5(): | |
| for y in NoGuessLen5(), Guess3Len5(), Guess30Len5(): | |
| self.assertEqual(zip(x, y), expected) | |
| # Test reduces()'s use of iterators. | |
| def test_deprecated_builtin_reduce(self): | |
| with check_py3k_warnings(): | |
| self._test_builtin_reduce() | |
| def _test_builtin_reduce(self): | |
| from operator import add | |
| self.assertEqual(reduce(add, SequenceClass(5)), 10) | |
| self.assertEqual(reduce(add, SequenceClass(5), 42), 52) | |
| self.assertRaises(TypeError, reduce, add, SequenceClass(0)) | |
| self.assertEqual(reduce(add, SequenceClass(0), 42), 42) | |
| self.assertEqual(reduce(add, SequenceClass(1)), 0) | |
| self.assertEqual(reduce(add, SequenceClass(1), 42), 42) | |
| 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)) | |
| @cpython_only | |
| def test_ref_counting_behavior(self): | |
| 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() |