import unittest import sys from test import test_support class G: 'Sequence using __getitem__' def __init__(self, seqn): self.seqn = seqn def __getitem__(self, i): return self.seqn[i] class I: 'Sequence using iterator protocol' def __init__(self, seqn): self.seqn = seqn self.i = 0 def __iter__(self): return self def next(self): if self.i >= len(self.seqn): raise StopIteration v = self.seqn[self.i] self.i += 1 return v class Ig: 'Sequence using iterator protocol defined with a generator' def __init__(self, seqn): self.seqn = seqn self.i = 0 def __iter__(self): for val in self.seqn: yield val class X: 'Missing __getitem__ and __iter__' def __init__(self, seqn): self.seqn = seqn self.i = 0 def next(self): if self.i >= len(self.seqn): raise StopIteration v = self.seqn[self.i] self.i += 1 return v class E: 'Test propagation of exceptions' def __init__(self, seqn): self.seqn = seqn self.i = 0 def __iter__(self): return self def next(self): 3 // 0 class N: 'Iterator missing next()' def __init__(self, seqn): self.seqn = seqn self.i = 0 def __iter__(self): return self class EnumerateTestCase(unittest.TestCase): enum = enumerate seq, res = 'abc', [(0,'a'), (1,'b'), (2,'c')] def test_basicfunction(self): self.assertEqual(type(self.enum(self.seq)), self.enum) e = self.enum(self.seq) self.assertEqual(iter(e), e) self.assertEqual(list(self.enum(self.seq)), self.res) self.enum.__doc__ def test_getitemseqn(self): self.assertEqual(list(self.enum(G(self.seq))), self.res) e = self.enum(G('')) self.assertRaises(StopIteration, e.next) def test_iteratorseqn(self): self.assertEqual(list(self.enum(I(self.seq))), self.res) e = self.enum(I('')) self.assertRaises(StopIteration, e.next) def test_iteratorgenerator(self): self.assertEqual(list(self.enum(Ig(self.seq))), self.res) e = self.enum(Ig('')) self.assertRaises(StopIteration, e.next) def test_noniterable(self): self.assertRaises(TypeError, self.enum, X(self.seq)) def test_illformediterable(self): self.assertRaises(TypeError, list, self.enum(N(self.seq))) def test_exception_propagation(self): self.assertRaises(ZeroDivisionError, list, self.enum(E(self.seq))) def test_argumentcheck(self): self.assertRaises(TypeError, self.enum) # no arguments self.assertRaises(TypeError, self.enum, 1) # wrong type (not iterable) self.assertRaises(TypeError, self.enum, 'abc', 'a') # wrong type self.assertRaises(TypeError, self.enum, 'abc', 2, 3) # too many arguments def test_tuple_reuse(self): # Tests an implementation detail where tuple is reused # whenever nothing else holds a reference to it self.assertEqual(len(set(map(id, list(enumerate(self.seq))))), len(self.seq)) self.assertEqual(len(set(map(id, enumerate(self.seq)))), min(1,len(self.seq))) class MyEnum(enumerate): pass class SubclassTestCase(EnumerateTestCase): enum = MyEnum class TestEmpty(EnumerateTestCase): seq, res = '', [] class TestBig(EnumerateTestCase): seq = range(10,20000,2) res = zip(range(20000), seq) class TestReversed(unittest.TestCase): def test_simple(self): class A: def __getitem__(self, i): if i < 5: return str(i) raise StopIteration def __len__(self): return 5 for data in 'abc', range(5), tuple(enumerate('abc')), A(), xrange(1,17,5): self.assertEqual(list(data)[::-1], list(reversed(data))) self.assertRaises(TypeError, reversed, {}) # don't allow keyword arguments self.assertRaises(TypeError, reversed, [], a=1) def test_xrange_optimization(self): x = xrange(1) self.assertEqual(type(reversed(x)), type(iter(x))) def test_len(self): # This is an implementation detail, not an interface requirement from test.test_iterlen import len for s in ('hello', tuple('hello'), list('hello'), xrange(5)): self.assertEqual(len(reversed(s)), len(s)) r = reversed(s) list(r) self.assertEqual(len(r), 0) class SeqWithWeirdLen: called = False def __len__(self): if not self.called: self.called = True return 10 raise ZeroDivisionError def __getitem__(self, index): return index r = reversed(SeqWithWeirdLen()) self.assertRaises(ZeroDivisionError, len, r) def test_gc(self): class Seq: def __len__(self): return 10 def __getitem__(self, index): return index s = Seq() r = reversed(s) s.r = r def test_args(self): self.assertRaises(TypeError, reversed) self.assertRaises(TypeError, reversed, [], 'extra') def test_bug1229429(self): # this bug was never in reversed, it was in # PyObject_CallMethod, and reversed_new calls that sometimes. if not hasattr(sys, "getrefcount"): return def f(): pass r = f.__reversed__ = object() rc = sys.getrefcount(r) for i in range(10): try: reversed(f) except TypeError: pass else: self.fail("non-callable __reversed__ didn't raise!") self.assertEqual(rc, sys.getrefcount(r)) class TestStart(EnumerateTestCase): enum = lambda i: enumerate(i, start=11) seq, res = 'abc', [(1, 'a'), (2, 'b'), (3, 'c')] class TestLongStart(EnumerateTestCase): enum = lambda i: enumerate(i, start=sys.maxint+1) seq, res = 'abc', [(sys.maxint+1,'a'), (sys.maxint+2,'b'), (sys.maxint+3,'c')] def test_main(verbose=None): testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig, TestReversed) test_support.run_unittest(*testclasses) # verify reference counting import sys if verbose and hasattr(sys, "gettotalrefcount"): counts = [None] * 5 for i in xrange(len(counts)): test_support.run_unittest(*testclasses) counts[i] = sys.gettotalrefcount() print counts if __name__ == "__main__": test_main(verbose=True)