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0242070d04
* Test with infinite inputs (using take() on the output) * Test whether GC can find and eliminate cycles.
579 lines
21 KiB
Python
579 lines
21 KiB
Python
import unittest
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from test import test_support
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from itertools import *
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import sys
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import operator
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def onearg(x):
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'Test function of one argument'
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return 2*x
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def errfunc(*args):
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'Test function that raises an error'
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raise ValueError
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def gen3():
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'Non-restartable source sequence'
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for i in (0, 1, 2):
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yield i
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def isEven(x):
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'Test predicate'
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return x%2==0
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def isOdd(x):
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'Test predicate'
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return x%2==1
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class StopNow:
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'Class emulating an empty iterable.'
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def __iter__(self):
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return self
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def next(self):
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raise StopIteration
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def take(n, seq):
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'Convenience function for partially consuming a long of infinite iterable'
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return list(islice(seq, n))
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class TestBasicOps(unittest.TestCase):
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def test_chain(self):
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self.assertEqual(list(chain('abc', 'def')), list('abcdef'))
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self.assertEqual(list(chain('abc')), list('abc'))
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self.assertEqual(list(chain('')), [])
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self.assertEqual(take(4, chain('abc', 'def')), list('abcd'))
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self.assertRaises(TypeError, chain, 2, 3)
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def test_count(self):
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self.assertEqual(zip('abc',count()), [('a', 0), ('b', 1), ('c', 2)])
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self.assertEqual(zip('abc',count(3)), [('a', 3), ('b', 4), ('c', 5)])
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self.assertEqual(take(2, zip('abc',count(3))), [('a', 3), ('b', 4)])
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self.assertRaises(TypeError, count, 2, 3)
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self.assertRaises(TypeError, count, 'a')
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c = count(sys.maxint-2) # verify that rollover doesn't crash
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c.next(); c.next(); c.next(); c.next(); c.next()
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def test_cycle(self):
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self.assertEqual(take(10, cycle('abc')), list('abcabcabca'))
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self.assertEqual(list(cycle('')), [])
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self.assertRaises(TypeError, cycle)
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self.assertRaises(TypeError, cycle, 5)
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self.assertEqual(list(islice(cycle(gen3()),10)), [0,1,2,0,1,2,0,1,2,0])
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def test_ifilter(self):
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self.assertEqual(list(ifilter(isEven, range(6))), [0,2,4])
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self.assertEqual(list(ifilter(None, [0,1,0,2,0])), [1,2])
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self.assertEqual(take(4, ifilter(isEven, count())), [0,2,4,6])
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self.assertRaises(TypeError, ifilter)
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self.assertRaises(TypeError, ifilter, lambda x:x)
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self.assertRaises(TypeError, ifilter, lambda x:x, range(6), 7)
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self.assertRaises(TypeError, ifilter, isEven, 3)
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self.assertRaises(TypeError, ifilter(range(6), range(6)).next)
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def test_ifilterfalse(self):
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self.assertEqual(list(ifilterfalse(isEven, range(6))), [1,3,5])
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self.assertEqual(list(ifilterfalse(None, [0,1,0,2,0])), [0,0,0])
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self.assertEqual(take(4, ifilterfalse(isEven, count())), [1,3,5,7])
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self.assertRaises(TypeError, ifilterfalse)
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self.assertRaises(TypeError, ifilterfalse, lambda x:x)
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self.assertRaises(TypeError, ifilterfalse, lambda x:x, range(6), 7)
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self.assertRaises(TypeError, ifilterfalse, isEven, 3)
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self.assertRaises(TypeError, ifilterfalse(range(6), range(6)).next)
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def test_izip(self):
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ans = [(x,y) for x, y in izip('abc',count())]
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self.assertEqual(ans, [('a', 0), ('b', 1), ('c', 2)])
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self.assertEqual(list(izip('abc', range(6))), zip('abc', range(6)))
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self.assertEqual(list(izip('abcdef', range(3))), zip('abcdef', range(3)))
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self.assertEqual(take(3,izip('abcdef', count())), zip('abcdef', range(3)))
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self.assertEqual(list(izip('abcdef')), zip('abcdef'))
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self.assertRaises(TypeError, izip)
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self.assertRaises(TypeError, izip, 3)
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self.assertRaises(TypeError, izip, range(3), 3)
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# Check tuple re-use (implementation detail)
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self.assertEqual([tuple(list(pair)) for pair in izip('abc', 'def')],
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zip('abc', 'def'))
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self.assertEqual([pair for pair in izip('abc', 'def')],
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zip('abc', 'def'))
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ids = map(id, izip('abc', 'def'))
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self.assertEqual(min(ids), max(ids))
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ids = map(id, list(izip('abc', 'def')))
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self.assertEqual(len(dict.fromkeys(ids)), len(ids))
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def test_repeat(self):
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self.assertEqual(zip(xrange(3),repeat('a')),
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[(0, 'a'), (1, 'a'), (2, 'a')])
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self.assertEqual(list(repeat('a', 3)), ['a', 'a', 'a'])
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self.assertEqual(take(3, repeat('a')), ['a', 'a', 'a'])
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self.assertEqual(list(repeat('a', 0)), [])
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self.assertEqual(list(repeat('a', -3)), [])
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self.assertRaises(TypeError, repeat)
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self.assertRaises(TypeError, repeat, None, 3, 4)
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self.assertRaises(TypeError, repeat, None, 'a')
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def test_imap(self):
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self.assertEqual(list(imap(operator.pow, range(3), range(1,7))),
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[0**1, 1**2, 2**3])
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self.assertEqual(list(imap(None, 'abc', range(5))),
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[('a',0),('b',1),('c',2)])
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self.assertEqual(list(imap(None, 'abc', count())),
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[('a',0),('b',1),('c',2)])
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self.assertEqual(take(2,imap(None, 'abc', count())),
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[('a',0),('b',1)])
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self.assertEqual(list(imap(operator.pow, [])), [])
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self.assertRaises(TypeError, imap)
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self.assertRaises(TypeError, imap, operator.neg)
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self.assertRaises(TypeError, imap(10, range(5)).next)
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self.assertRaises(ValueError, imap(errfunc, [4], [5]).next)
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self.assertRaises(TypeError, imap(onearg, [4], [5]).next)
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def test_starmap(self):
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self.assertEqual(list(starmap(operator.pow, zip(range(3), range(1,7)))),
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[0**1, 1**2, 2**3])
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self.assertEqual(take(3, starmap(operator.pow, izip(count(), count(1)))),
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[0**1, 1**2, 2**3])
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self.assertEqual(list(starmap(operator.pow, [])), [])
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self.assertRaises(TypeError, list, starmap(operator.pow, [[4,5]]))
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self.assertRaises(TypeError, starmap)
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self.assertRaises(TypeError, starmap, operator.pow, [(4,5)], 'extra')
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self.assertRaises(TypeError, starmap(10, [(4,5)]).next)
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self.assertRaises(ValueError, starmap(errfunc, [(4,5)]).next)
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self.assertRaises(TypeError, starmap(onearg, [(4,5)]).next)
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def test_islice(self):
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for args in [ # islice(args) should agree with range(args)
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(10, 20, 3),
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(10, 3, 20),
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(10, 20),
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(10, 3),
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(20,)
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]:
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self.assertEqual(list(islice(xrange(100), *args)), range(*args))
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for args, tgtargs in [ # Stop when seqn is exhausted
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((10, 110, 3), ((10, 100, 3))),
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((10, 110), ((10, 100))),
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((110,), (100,))
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]:
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self.assertEqual(list(islice(xrange(100), *args)), range(*tgtargs))
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# Test stop=None
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self.assertEqual(list(islice(xrange(10), None)), range(10))
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self.assertEqual(list(islice(xrange(10), 2, None)), range(2, 10))
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self.assertEqual(list(islice(xrange(10), 1, None, 2)), range(1, 10, 2))
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# Test invalid arguments
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self.assertRaises(TypeError, islice, xrange(10))
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self.assertRaises(TypeError, islice, xrange(10), 1, 2, 3, 4)
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self.assertRaises(ValueError, islice, xrange(10), -5, 10, 1)
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self.assertRaises(ValueError, islice, xrange(10), 1, -5, -1)
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self.assertRaises(ValueError, islice, xrange(10), 1, 10, -1)
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self.assertRaises(ValueError, islice, xrange(10), 1, 10, 0)
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self.assertRaises(ValueError, islice, xrange(10), 'a')
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self.assertRaises(ValueError, islice, xrange(10), 'a', 1)
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self.assertRaises(ValueError, islice, xrange(10), 1, 'a')
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self.assertRaises(ValueError, islice, xrange(10), 'a', 1, 1)
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self.assertRaises(ValueError, islice, xrange(10), 1, 'a', 1)
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self.assertEqual(len(list(islice(count(), 1, 10, sys.maxint))), 1)
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def test_takewhile(self):
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data = [1, 3, 5, 20, 2, 4, 6, 8]
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underten = lambda x: x<10
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self.assertEqual(list(takewhile(underten, data)), [1, 3, 5])
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self.assertEqual(list(takewhile(underten, [])), [])
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self.assertRaises(TypeError, takewhile)
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self.assertRaises(TypeError, takewhile, operator.pow)
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self.assertRaises(TypeError, takewhile, operator.pow, [(4,5)], 'extra')
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self.assertRaises(TypeError, takewhile(10, [(4,5)]).next)
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self.assertRaises(ValueError, takewhile(errfunc, [(4,5)]).next)
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def test_dropwhile(self):
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data = [1, 3, 5, 20, 2, 4, 6, 8]
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underten = lambda x: x<10
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self.assertEqual(list(dropwhile(underten, data)), [20, 2, 4, 6, 8])
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self.assertEqual(list(dropwhile(underten, [])), [])
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self.assertRaises(TypeError, dropwhile)
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self.assertRaises(TypeError, dropwhile, operator.pow)
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self.assertRaises(TypeError, dropwhile, operator.pow, [(4,5)], 'extra')
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self.assertRaises(TypeError, dropwhile(10, [(4,5)]).next)
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self.assertRaises(ValueError, dropwhile(errfunc, [(4,5)]).next)
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def test_StopIteration(self):
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for f in (chain, cycle, izip):
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self.assertRaises(StopIteration, f([]).next)
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self.assertRaises(StopIteration, f(StopNow()).next)
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self.assertRaises(StopIteration, islice([], None).next)
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self.assertRaises(StopIteration, islice(StopNow(), None).next)
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self.assertRaises(StopIteration, repeat(None, 0).next)
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for f in (ifilter, ifilterfalse, imap, takewhile, dropwhile, starmap):
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self.assertRaises(StopIteration, f(lambda x:x, []).next)
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self.assertRaises(StopIteration, f(lambda x:x, StopNow()).next)
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def R(seqn):
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'Regular generator'
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for i in seqn:
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yield i
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class G:
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'Sequence using __getitem__'
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def __init__(self, seqn):
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self.seqn = seqn
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def __getitem__(self, i):
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return self.seqn[i]
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class I:
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'Sequence using iterator protocol'
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def __init__(self, seqn):
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self.seqn = seqn
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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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if self.i >= len(self.seqn): raise StopIteration
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v = self.seqn[self.i]
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self.i += 1
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return v
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class Ig:
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'Sequence using iterator protocol defined with a generator'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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for val in self.seqn:
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yield val
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class X:
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'Missing __getitem__ and __iter__'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def next(self):
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if self.i >= len(self.seqn): raise StopIteration
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v = self.seqn[self.i]
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self.i += 1
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return v
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class N:
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'Iterator missing next()'
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def __init__(self, seqn):
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self.seqn = seqn
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self.i = 0
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def __iter__(self):
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return self
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class E:
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'Test propagation of exceptions'
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def __init__(self, seqn):
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self.seqn = seqn
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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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3/0
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class S:
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'Test immediate stop'
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def __init__(self, seqn):
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pass
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def __iter__(self):
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return self
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def next(self):
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raise StopIteration
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def L(seqn):
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'Test multiple tiers of iterators'
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return chain(imap(lambda x:x, R(Ig(G(seqn)))))
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class TestGC(unittest.TestCase):
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def makecycle(self, iterator, container):
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container.append(iterator)
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iterator.next()
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del container, iterator
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def test_chain(self):
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a = []
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self.makecycle(chain(a), a)
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def test_cycle(self):
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a = []
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self.makecycle(cycle([a]*2), a)
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def test_ifilter(self):
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a = []
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self.makecycle(ifilter(lambda x:True, [a]*2), a)
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def test_ifilterfalse(self):
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a = []
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self.makecycle(ifilterfalse(lambda x:False, a), a)
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def test_izip(self):
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a = []
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self.makecycle(izip([a]*2, [a]*3), a)
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def test_imap(self):
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a = []
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self.makecycle(imap(lambda x:x, [a]*2), a)
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def test_islice(self):
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a = []
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self.makecycle(islice([a]*2, None), a)
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def test_starmap(self):
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a = []
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self.makecycle(starmap(lambda *t: t, [(a,a)]*2), a)
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class TestVariousIteratorArgs(unittest.TestCase):
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def test_chain(self):
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for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual(list(chain(g(s))), list(g(s)))
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self.assertEqual(list(chain(g(s), g(s))), list(g(s))+list(g(s)))
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self.assertRaises(TypeError, chain, X(s))
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self.assertRaises(TypeError, list, chain(N(s)))
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self.assertRaises(ZeroDivisionError, list, chain(E(s)))
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def test_cycle(self):
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for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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tgtlen = len(s) * 3
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expected = list(g(s))*3
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actual = list(islice(cycle(g(s)), tgtlen))
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self.assertEqual(actual, expected)
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self.assertRaises(TypeError, cycle, X(s))
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self.assertRaises(TypeError, list, cycle(N(s)))
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self.assertRaises(ZeroDivisionError, list, cycle(E(s)))
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def test_ifilter(self):
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for s in (range(10), range(0), range(1000), (7,11), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual(list(ifilter(isEven, g(s))), filter(isEven, g(s)))
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self.assertRaises(TypeError, ifilter, isEven, X(s))
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self.assertRaises(TypeError, list, ifilter(isEven, N(s)))
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self.assertRaises(ZeroDivisionError, list, ifilter(isEven, E(s)))
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def test_ifilterfalse(self):
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for s in (range(10), range(0), range(1000), (7,11), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual(list(ifilterfalse(isEven, g(s))), filter(isOdd, g(s)))
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self.assertRaises(TypeError, ifilterfalse, isEven, X(s))
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self.assertRaises(TypeError, list, ifilterfalse(isEven, N(s)))
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self.assertRaises(ZeroDivisionError, list, ifilterfalse(isEven, E(s)))
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def test_izip(self):
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for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual(list(izip(g(s))), zip(g(s)))
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self.assertEqual(list(izip(g(s), g(s))), zip(g(s), g(s)))
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self.assertRaises(TypeError, izip, X(s))
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self.assertRaises(TypeError, list, izip(N(s)))
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self.assertRaises(ZeroDivisionError, list, izip(E(s)))
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def test_imap(self):
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for s in (range(10), range(0), range(100), (7,11), xrange(20,50,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual(list(imap(onearg, g(s))), map(onearg, g(s)))
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self.assertEqual(list(imap(operator.pow, g(s), g(s))), map(operator.pow, g(s), g(s)))
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self.assertRaises(TypeError, imap, onearg, X(s))
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self.assertRaises(TypeError, list, imap(onearg, N(s)))
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self.assertRaises(ZeroDivisionError, list, imap(onearg, E(s)))
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def test_islice(self):
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for s in ("12345", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual(list(islice(g(s),1,None,2)), list(g(s))[1::2])
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self.assertRaises(TypeError, islice, X(s), 10)
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self.assertRaises(TypeError, list, islice(N(s), 10))
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self.assertRaises(ZeroDivisionError, list, islice(E(s), 10))
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def test_starmap(self):
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for s in (range(10), range(0), range(100), (7,11), xrange(20,50,5)):
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for g in (G, I, Ig, S, L, R):
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ss = zip(s, s)
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self.assertEqual(list(starmap(operator.pow, g(ss))), map(operator.pow, g(s), g(s)))
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self.assertRaises(TypeError, starmap, operator.pow, X(ss))
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self.assertRaises(TypeError, list, starmap(operator.pow, N(ss)))
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self.assertRaises(ZeroDivisionError, list, starmap(operator.pow, E(ss)))
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def test_takewhile(self):
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for s in (range(10), range(0), range(1000), (7,11), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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tgt = []
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for elem in g(s):
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if not isEven(elem): break
|
|
tgt.append(elem)
|
|
self.assertEqual(list(takewhile(isEven, g(s))), tgt)
|
|
self.assertRaises(TypeError, takewhile, isEven, X(s))
|
|
self.assertRaises(TypeError, list, takewhile(isEven, N(s)))
|
|
self.assertRaises(ZeroDivisionError, list, takewhile(isEven, E(s)))
|
|
|
|
def test_dropwhile(self):
|
|
for s in (range(10), range(0), range(1000), (7,11), xrange(2000,2200,5)):
|
|
for g in (G, I, Ig, S, L, R):
|
|
tgt = []
|
|
for elem in g(s):
|
|
if not tgt and isOdd(elem): continue
|
|
tgt.append(elem)
|
|
self.assertEqual(list(dropwhile(isOdd, g(s))), tgt)
|
|
self.assertRaises(TypeError, dropwhile, isOdd, X(s))
|
|
self.assertRaises(TypeError, list, dropwhile(isOdd, N(s)))
|
|
self.assertRaises(ZeroDivisionError, list, dropwhile(isOdd, E(s)))
|
|
|
|
|
|
libreftest = """ Doctest for examples in the library reference: libitertools.tex
|
|
|
|
|
|
>>> amounts = [120.15, 764.05, 823.14]
|
|
>>> for checknum, amount in izip(count(1200), amounts):
|
|
... print 'Check %d is for $%.2f' % (checknum, amount)
|
|
...
|
|
Check 1200 is for $120.15
|
|
Check 1201 is for $764.05
|
|
Check 1202 is for $823.14
|
|
|
|
>>> import operator
|
|
>>> for cube in imap(operator.pow, xrange(1,4), repeat(3)):
|
|
... print cube
|
|
...
|
|
1
|
|
8
|
|
27
|
|
|
|
>>> reportlines = ['EuroPython', 'Roster', '', 'alex', '', 'laura', '', 'martin', '', 'walter', '', 'samuele']
|
|
>>> for name in islice(reportlines, 3, None, 2):
|
|
... print name.title()
|
|
...
|
|
Alex
|
|
Laura
|
|
Martin
|
|
Walter
|
|
Samuele
|
|
|
|
>>> def enumerate(iterable):
|
|
... return izip(count(), iterable)
|
|
|
|
>>> def tabulate(function):
|
|
... "Return function(0), function(1), ..."
|
|
... return imap(function, count())
|
|
|
|
>>> def iteritems(mapping):
|
|
... return izip(mapping.iterkeys(), mapping.itervalues())
|
|
|
|
>>> def nth(iterable, n):
|
|
... "Returns the nth item"
|
|
... return list(islice(iterable, n, n+1))
|
|
|
|
>>> def all(pred, seq):
|
|
... "Returns True if pred(x) is True for every element in the iterable"
|
|
... return not nth(ifilterfalse(pred, seq), 0)
|
|
|
|
>>> def some(pred, seq):
|
|
... "Returns True if pred(x) is True for at least one element in the iterable"
|
|
... return bool(nth(ifilter(pred, seq), 0))
|
|
|
|
>>> def no(pred, seq):
|
|
... "Returns True if pred(x) is False for every element in the iterable"
|
|
... return not nth(ifilter(pred, seq), 0)
|
|
|
|
>>> def padnone(seq):
|
|
... "Returns the sequence elements and then returns None indefinitely"
|
|
... return chain(seq, repeat(None))
|
|
|
|
>>> def ncycles(seq, n):
|
|
... "Returns the sequence elements n times"
|
|
... return chain(*repeat(seq, n))
|
|
|
|
>>> def dotproduct(vec1, vec2):
|
|
... return sum(imap(operator.mul, vec1, vec2))
|
|
|
|
>>> def window(seq, n=2):
|
|
... "Returns a sliding window (of width n) over data from the iterable"
|
|
... " s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ... "
|
|
... it = iter(seq)
|
|
... result = tuple(islice(it, n))
|
|
... if len(result) == n:
|
|
... yield result
|
|
... for elem in it:
|
|
... result = result[1:] + (elem,)
|
|
... yield result
|
|
|
|
>>> def take(n, seq):
|
|
... return list(islice(seq, n))
|
|
|
|
This is not part of the examples but it tests to make sure the definitions
|
|
perform as purported.
|
|
|
|
>>> list(enumerate('abc'))
|
|
[(0, 'a'), (1, 'b'), (2, 'c')]
|
|
|
|
>>> list(islice(tabulate(lambda x: 2*x), 4))
|
|
[0, 2, 4, 6]
|
|
|
|
>>> nth('abcde', 3)
|
|
['d']
|
|
|
|
>>> all(lambda x: x%2==0, [2, 4, 6, 8])
|
|
True
|
|
|
|
>>> all(lambda x: x%2==0, [2, 3, 6, 8])
|
|
False
|
|
|
|
>>> some(lambda x: x%2==0, [2, 4, 6, 8])
|
|
True
|
|
|
|
>>> some(lambda x: x%2==0, [1, 3, 5, 9])
|
|
False
|
|
|
|
>>> no(lambda x: x%2==0, [1, 3, 5, 9])
|
|
True
|
|
|
|
>>> no(lambda x: x%2==0, [1, 2, 5, 9])
|
|
False
|
|
|
|
>>> list(window('abc'))
|
|
[('a', 'b'), ('b', 'c')]
|
|
|
|
>>> list(window('abc',5))
|
|
[]
|
|
|
|
>>> list(islice(padnone('abc'), 0, 6))
|
|
['a', 'b', 'c', None, None, None]
|
|
|
|
>>> list(ncycles('abc', 3))
|
|
['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c']
|
|
|
|
>>> dotproduct([1,2,3], [4,5,6])
|
|
32
|
|
|
|
>>> take(10, count())
|
|
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
|
|
"""
|
|
|
|
__test__ = {'libreftest' : libreftest}
|
|
|
|
def test_main(verbose=None):
|
|
test_classes = (TestBasicOps, TestVariousIteratorArgs, TestGC)
|
|
test_support.run_unittest(*test_classes)
|
|
|
|
# verify reference counting
|
|
if verbose and hasattr(sys, "gettotalrefcount"):
|
|
import gc
|
|
counts = [None] * 5
|
|
for i in xrange(len(counts)):
|
|
test_support.run_unittest(*test_classes)
|
|
gc.collect()
|
|
counts[i] = sys.gettotalrefcount()
|
|
print counts
|
|
|
|
# doctest the examples in the library reference
|
|
test_support.run_doctest(sys.modules[__name__], verbose)
|
|
|
|
if __name__ == "__main__":
|
|
test_main(verbose=True)
|