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Code Issues Projects Releases Packages Wiki Activity Actions 17

Replace map(None, *iterables) with zip(*iterables).

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Raymond Hettinger 2008-01-22 23:25:35 +00:00
parent 86def6cb2b
commit 1dfde1ddc0
9 changed files with 20 additions and 90 deletions
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11
Lib/test/test_itertools.py
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@ -236,7 +236,7 @@ class TestBasicOps(unittest.TestCase):
self.assertEqual(list(izip_longest('abcdef')), list(zip('abcdef')))
self.assertEqual(list(izip_longest('abc', 'defg', **{})),
list(map(None, list('abc')+[None], 'defg'))) # empty keyword dict
list(izip(list('abc')+[None], 'defg'))) # empty keyword dict
self.assertRaises(TypeError, izip_longest, 3)
self.assertRaises(TypeError, izip_longest, range(3), 3)
@ -281,14 +281,17 @@ class TestBasicOps(unittest.TestCase):
def test_imap(self):
self.assertEqual(list(imap(operator.pow, range(3), range(1,7))),
[0**1, 1**2, 2**3])
self.assertEqual(list(imap(None, 'abc', range(5))),
def tupleize(*args):
return args
self.assertEqual(list(imap(tupleize, 'abc', range(5))),
[('a',0),('b',1),('c',2)])
self.assertEqual(list(imap(None, 'abc', count())),
self.assertEqual(list(imap(tupleize, 'abc', count())),
[('a',0),('b',1),('c',2)])
self.assertEqual(take(2,imap(None, 'abc', count())),
self.assertEqual(take(2,imap(tupleize, 'abc', count())),
[('a',0),('b',1)])
self.assertEqual(list(imap(operator.pow, [])), [])
self.assertRaises(TypeError, imap)
self.assertRaises(TypeError, list, imap(None, range(3), range(3)))
self.assertRaises(TypeError, imap, operator.neg)
self.assertRaises(TypeError, next, imap(10, range(5)))
self.assertRaises(ValueError, next, imap(errfunc, [4], [5]))