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0a4977c2f3
__getitem__() and __setitem__(). Simplifies the API, reduces the code size, adds flexibility, and makes deques work with bisect.bisect(), random.shuffle(), and random.sample().
510 lines
15 KiB
Python
510 lines
15 KiB
Python
from collections import deque
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import unittest
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from test import test_support
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import copy
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import cPickle as pickle
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from cStringIO import StringIO
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import random
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BIG = 100000
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class TestBasic(unittest.TestCase):
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def test_basics(self):
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d = deque(xrange(100))
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d.__init__(xrange(100, 200))
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for i in xrange(200, 400):
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d.append(i)
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for i in reversed(xrange(-200, 0)):
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d.appendleft(i)
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self.assertEqual(list(d), range(-200, 400))
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self.assertEqual(len(d), 600)
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left = [d.popleft() for i in xrange(250)]
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self.assertEqual(left, range(-200, 50))
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self.assertEqual(list(d), range(50, 400))
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right = [d.pop() for i in xrange(250)]
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right.reverse()
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self.assertEqual(right, range(150, 400))
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self.assertEqual(list(d), range(50, 150))
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def test_comparisons(self):
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d = deque('xabc'); d.popleft()
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for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
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self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
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self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))
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args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
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for x in args:
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for y in args:
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self.assertEqual(x == y, list(x) == list(y), (x,y))
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self.assertEqual(x != y, list(x) != list(y), (x,y))
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self.assertEqual(x < y, list(x) < list(y), (x,y))
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self.assertEqual(x <= y, list(x) <= list(y), (x,y))
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self.assertEqual(x > y, list(x) > list(y), (x,y))
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self.assertEqual(x >= y, list(x) >= list(y), (x,y))
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self.assertEqual(cmp(x,y), cmp(list(x),list(y)), (x,y))
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def test_extend(self):
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d = deque('a')
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self.assertRaises(TypeError, d.extend, 1)
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d.extend('bcd')
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self.assertEqual(list(d), list('abcd'))
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def test_extendleft(self):
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d = deque('a')
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self.assertRaises(TypeError, d.extendleft, 1)
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d.extendleft('bcd')
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self.assertEqual(list(d), list(reversed('abcd')))
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def test_getitem(self):
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n = 200
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d = deque(xrange(n))
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l = range(n)
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for i in xrange(n):
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d.popleft()
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l.pop(0)
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if random.random() < 0.5:
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d.append(i)
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l.append(i)
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for j in xrange(1-len(l), len(l)):
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assert d[j] == l[j]
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d = deque('superman')
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self.assertEqual(d[0], 's')
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self.assertEqual(d[-1], 'n')
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d = deque()
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self.assertRaises(IndexError, d.__getitem__, 0)
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self.assertRaises(IndexError, d.__getitem__, -1)
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def test_setitem(self):
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n = 200
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d = deque(xrange(n))
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for i in xrange(n):
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d[i] = 10 * i
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self.assertEqual(list(d), [10*i for i in xrange(n)])
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l = list(d)
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for i in xrange(1-n, 0, -1):
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d[i] = 7*i
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l[i] = 7*i
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self.assertEqual(list(d), l)
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def test_rotate(self):
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s = tuple('abcde')
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n = len(s)
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d = deque(s)
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d.rotate(1) # verify rot(1)
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self.assertEqual(''.join(d), 'eabcd')
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d = deque(s)
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d.rotate(-1) # verify rot(-1)
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self.assertEqual(''.join(d), 'bcdea')
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d.rotate() # check default to 1
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self.assertEqual(tuple(d), s)
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for i in xrange(n*3):
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d = deque(s)
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e = deque(d)
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d.rotate(i) # check vs. rot(1) n times
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for j in xrange(i):
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e.rotate(1)
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self.assertEqual(tuple(d), tuple(e))
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d.rotate(-i) # check that it works in reverse
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self.assertEqual(tuple(d), s)
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e.rotate(n-i) # check that it wraps forward
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self.assertEqual(tuple(e), s)
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for i in xrange(n*3):
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d = deque(s)
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e = deque(d)
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d.rotate(-i)
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for j in xrange(i):
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e.rotate(-1) # check vs. rot(-1) n times
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self.assertEqual(tuple(d), tuple(e))
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d.rotate(i) # check that it works in reverse
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self.assertEqual(tuple(d), s)
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e.rotate(i-n) # check that it wraps backaround
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self.assertEqual(tuple(e), s)
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d = deque(s)
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e = deque(s)
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e.rotate(BIG+17) # verify on long series of rotates
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dr = d.rotate
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for i in xrange(BIG+17):
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dr()
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self.assertEqual(tuple(d), tuple(e))
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def test_len(self):
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d = deque('ab')
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self.assertEqual(len(d), 2)
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d.popleft()
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self.assertEqual(len(d), 1)
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d.pop()
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self.assertEqual(len(d), 0)
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self.assertRaises(IndexError, d.pop)
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self.assertEqual(len(d), 0)
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d.append('c')
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self.assertEqual(len(d), 1)
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d.appendleft('d')
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self.assertEqual(len(d), 2)
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d.clear()
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self.assertEqual(len(d), 0)
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def test_underflow(self):
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d = deque()
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self.assertRaises(IndexError, d.pop)
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self.assertRaises(IndexError, d.popleft)
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def test_clear(self):
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d = deque(xrange(100))
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self.assertEqual(len(d), 100)
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d.clear()
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self.assertEqual(len(d), 0)
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self.assertEqual(list(d), [])
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def test_repr(self):
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d = deque(xrange(200))
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e = eval(repr(d))
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self.assertEqual(list(d), list(e))
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d.append(d)
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self.assert_('...' in repr(d))
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def test_print(self):
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d = deque(xrange(200))
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d.append(d)
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f = StringIO()
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print >> f, d,
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self.assertEqual(f.getvalue(), repr(d))
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f.close()
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def test_hash(self):
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self.assertRaises(TypeError, hash, deque('abc'))
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def test_long_steadystate_queue_popleft(self):
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for size in (0, 1, 2, 100, 1000):
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d = deque(xrange(size))
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append, pop = d.append, d.popleft
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for i in xrange(size, BIG):
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append(i)
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x = pop()
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if x != i - size:
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self.assertEqual(x, i-size)
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self.assertEqual(list(d), range(BIG-size, BIG))
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def test_long_steadystate_queue_popright(self):
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for size in (0, 1, 2, 100, 1000):
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d = deque(reversed(xrange(size)))
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append, pop = d.appendleft, d.pop
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for i in xrange(size, BIG):
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append(i)
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x = pop()
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if x != i - size:
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self.assertEqual(x, i-size)
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self.assertEqual(list(reversed(list(d))), range(BIG-size, BIG))
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def test_big_queue_popleft(self):
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pass
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d = deque()
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append, pop = d.append, d.popleft
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for i in xrange(BIG):
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append(i)
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for i in xrange(BIG):
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x = pop()
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if x != i:
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self.assertEqual(x, i)
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def test_big_queue_popright(self):
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d = deque()
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append, pop = d.appendleft, d.pop
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for i in xrange(BIG):
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append(i)
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for i in xrange(BIG):
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x = pop()
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if x != i:
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self.assertEqual(x, i)
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def test_big_stack_right(self):
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d = deque()
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append, pop = d.append, d.pop
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for i in xrange(BIG):
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append(i)
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for i in reversed(xrange(BIG)):
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x = pop()
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if x != i:
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self.assertEqual(x, i)
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self.assertEqual(len(d), 0)
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def test_big_stack_left(self):
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d = deque()
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append, pop = d.appendleft, d.popleft
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for i in xrange(BIG):
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append(i)
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for i in reversed(xrange(BIG)):
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x = pop()
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if x != i:
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self.assertEqual(x, i)
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self.assertEqual(len(d), 0)
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def test_roundtrip_iter_init(self):
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d = deque(xrange(200))
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e = deque(d)
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self.assertNotEqual(id(d), id(e))
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self.assertEqual(list(d), list(e))
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def test_pickle(self):
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d = deque(xrange(200))
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s = pickle.dumps(d)
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e = pickle.loads(s)
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self.assertNotEqual(id(d), id(e))
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self.assertEqual(list(d), list(e))
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def test_deepcopy(self):
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mut = [10]
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d = deque([mut])
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e = copy.deepcopy(d)
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self.assertEqual(list(d), list(e))
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mut[0] = 11
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self.assertNotEqual(id(d), id(e))
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self.assertNotEqual(list(d), list(e))
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def test_copy(self):
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mut = [10]
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d = deque([mut])
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e = copy.copy(d)
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self.assertEqual(list(d), list(e))
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mut[0] = 11
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self.assertNotEqual(id(d), id(e))
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self.assertEqual(list(d), list(e))
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def test_reversed(self):
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for s in ('abcd', xrange(2000)):
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self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
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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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from itertools import chain, imap
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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 TestVariousIteratorArgs(unittest.TestCase):
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def test_constructor(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(deque(g(s))), list(g(s)))
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self.assertRaises(TypeError, deque, X(s))
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self.assertRaises(TypeError, deque, N(s))
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self.assertRaises(ZeroDivisionError, deque, E(s))
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def test_iter_with_altered_data(self):
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d = deque('abcdefg')
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it = iter(d)
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d.pop()
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self.assertRaises(RuntimeError, it.next)
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class Deque(deque):
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pass
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class TestSubclass(unittest.TestCase):
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def test_basics(self):
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d = Deque(xrange(100))
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d.__init__(xrange(100, 200))
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for i in xrange(200, 400):
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d.append(i)
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for i in reversed(xrange(-200, 0)):
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d.appendleft(i)
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self.assertEqual(list(d), range(-200, 400))
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self.assertEqual(len(d), 600)
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left = [d.popleft() for i in xrange(250)]
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self.assertEqual(left, range(-200, 50))
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self.assertEqual(list(d), range(50, 400))
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right = [d.pop() for i in xrange(250)]
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right.reverse()
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self.assertEqual(right, range(150, 400))
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self.assertEqual(list(d), range(50, 150))
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d.clear()
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self.assertEqual(len(d), 0)
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def test_copy_pickle(self):
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d = Deque('abc')
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e = d.__copy__()
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self.assertEqual(type(d), type(e))
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self.assertEqual(list(d), list(e))
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e = Deque(d)
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self.assertEqual(type(d), type(e))
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self.assertEqual(list(d), list(e))
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s = pickle.dumps(d)
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e = pickle.loads(s)
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self.assertNotEqual(id(d), id(e))
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self.assertEqual(type(d), type(e))
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self.assertEqual(list(d), list(e))
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#==============================================================================
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libreftest = """
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Example from the Library Reference: Doc/lib/libcollections.tex
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>>> from collections import deque
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>>> d = deque('ghi') # make a new deque with three items
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>>> for elem in d: # iterate over the deque's elements
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... print elem.upper()
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G
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H
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I
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>>> d.append('j') # add a new entry to the right side
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>>> d.appendleft('f') # add a new entry to the left side
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>>> d # show the representation of the deque
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deque(['f', 'g', 'h', 'i', 'j'])
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>>> d.pop() # return and remove the rightmost item
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'j'
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>>> d.popleft() # return and remove the leftmost item
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'f'
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>>> list(d) # list the contents of the deque
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['g', 'h', 'i']
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>>> d[0] # peek at leftmost item
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'g'
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>>> d[-1] # peek at rightmost item
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'i'
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>>> list(reversed(d)) # list the contents of a deque in reverse
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['i', 'h', 'g']
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>>> 'h' in d # search the deque
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True
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>>> d.extend('jkl') # add multiple elements at once
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>>> d
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deque(['g', 'h', 'i', 'j', 'k', 'l'])
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>>> d.rotate(1) # right rotation
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>>> d
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deque(['l', 'g', 'h', 'i', 'j', 'k'])
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>>> d.rotate(-1) # left rotation
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>>> d
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deque(['g', 'h', 'i', 'j', 'k', 'l'])
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>>> deque(reversed(d)) # make a new deque in reverse order
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deque(['l', 'k', 'j', 'i', 'h', 'g'])
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>>> d.clear() # empty the deque
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>>> d.pop() # cannot pop from an empty deque
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Traceback (most recent call last):
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File "<pyshell#6>", line 1, in -toplevel-
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d.pop()
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IndexError: pop from an empty deque
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>>> d.extendleft('abc') # extendleft() reverses the input order
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>>> d
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deque(['c', 'b', 'a'])
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"""
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#==============================================================================
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__test__ = {'libreftest' : libreftest}
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def test_main(verbose=None):
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import sys
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from test import test_sets
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test_classes = (
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TestBasic,
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TestVariousIteratorArgs,
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TestSubclass,
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)
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test_support.run_unittest(*test_classes)
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# verify reference counting
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if verbose and hasattr(sys, "gettotalrefcount"):
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import gc
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counts = [None] * 5
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for i in xrange(len(counts)):
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test_support.run_unittest(*test_classes)
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gc.collect()
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counts[i] = sys.gettotalrefcount()
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print counts
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# doctests
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from test import test_deque
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test_support.run_doctest(test_deque, verbose)
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if __name__ == "__main__":
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test_main(verbose=True)
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