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cpython/Lib/test/test_deque.py

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from collections import deque
import unittest
from test import test_support, seq_tests
from weakref import proxy
import copy
import cPickle as pickle
import random
import os
BIG = 100000
def fail():
raise SyntaxError
yield 1
class BadCmp:
def __eq__(self, other):
raise RuntimeError
class MutateCmp:
def __init__(self, deque, result):
self.deque = deque
self.result = result
def __eq__(self, other):
self.deque.clear()
return self.result
class TestBasic(unittest.TestCase):
def test_basics(self):
d = deque(xrange(-5125, -5000))
d.__init__(xrange(200))
for i in xrange(200, 400):
d.append(i)
for i in reversed(xrange(-200, 0)):
d.appendleft(i)
self.assertEqual(list(d), range(-200, 400))
self.assertEqual(len(d), 600)
left = [d.popleft() for i in xrange(250)]
self.assertEqual(left, range(-200, 50))
self.assertEqual(list(d), range(50, 400))
right = [d.pop() for i in xrange(250)]
right.reverse()
self.assertEqual(right, range(150, 400))
self.assertEqual(list(d), range(50, 150))
def test_maxlen(self):
self.assertRaises(ValueError, deque, 'abc', -1)
self.assertRaises(ValueError, deque, 'abc', -2)
d = deque(range(10), maxlen=3)
self.assertEqual(repr(d), 'deque([7, 8, 9], maxlen=3)')
self.assertEqual(list(d), range(7, 10))
self.assertEqual(d, deque(range(10), 3))
d.append(10)
self.assertEqual(list(d), range(8, 11))
d.appendleft(7)
self.assertEqual(list(d), range(7, 10))
d.extend([10, 11])
self.assertEqual(list(d), range(9, 12))
d.extendleft([8, 7])
self.assertEqual(list(d), range(7, 10))
d = deque(xrange(200), maxlen=10)
d.append(d)
test_support.unlink(test_support.TESTFN)
fo = open(test_support.TESTFN, "wb")
try:
print >> fo, d,
fo.close()
fo = open(test_support.TESTFN, "rb")
self.assertEqual(fo.read(), repr(d))
finally:
fo.close()
test_support.unlink(test_support.TESTFN)
d = deque(range(10), maxlen=None)
self.assertEqual(repr(d), 'deque([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])')
fo = open(test_support.TESTFN, "wb")
try:
print >> fo, d,
fo.close()
fo = open(test_support.TESTFN, "rb")
self.assertEqual(fo.read(), repr(d))
finally:
fo.close()
test_support.unlink(test_support.TESTFN)
def test_comparisons(self):
d = deque('xabc'); d.popleft()
for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))
args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
for x in args:
for y in args:
self.assertEqual(x == y, list(x) == list(y), (x,y))
self.assertEqual(x != y, list(x) != list(y), (x,y))
self.assertEqual(x < y, list(x) < list(y), (x,y))
self.assertEqual(x <= y, list(x) <= list(y), (x,y))
self.assertEqual(x > y, list(x) > list(y), (x,y))
self.assertEqual(x >= y, list(x) >= list(y), (x,y))
self.assertEqual(cmp(x,y), cmp(list(x),list(y)), (x,y))
def test_extend(self):
d = deque('a')
self.assertRaises(TypeError, d.extend, 1)
d.extend('bcd')
self.assertEqual(list(d), list('abcd'))
def test_extendleft(self):
d = deque('a')
self.assertRaises(TypeError, d.extendleft, 1)
d.extendleft('bcd')
self.assertEqual(list(d), list(reversed('abcd')))
d = deque()
d.extendleft(range(1000))
self.assertEqual(list(d), list(reversed(range(1000))))
self.assertRaises(SyntaxError, d.extendleft, fail())
def test_getitem(self):
n = 200
d = deque(xrange(n))
l = range(n)
for i in xrange(n):
d.popleft()
l.pop(0)
if random.random() < 0.5:
d.append(i)
l.append(i)
for j in xrange(1-len(l), len(l)):
assert d[j] == l[j]
d = deque('superman')
self.assertEqual(d[0], 's')
self.assertEqual(d[-1], 'n')
d = deque()
self.assertRaises(IndexError, d.__getitem__, 0)
self.assertRaises(IndexError, d.__getitem__, -1)
def test_setitem(self):
n = 200
d = deque(xrange(n))
for i in xrange(n):
d[i] = 10 * i
self.assertEqual(list(d), [10*i for i in xrange(n)])
l = list(d)
for i in xrange(1-n, 0, -1):
d[i] = 7*i
l[i] = 7*i
self.assertEqual(list(d), l)
def test_delitem(self):
n = 500 # O(n**2) test, don't make this too big
d = deque(xrange(n))
self.assertRaises(IndexError, d.__delitem__, -n-1)
self.assertRaises(IndexError, d.__delitem__, n)
for i in xrange(n):
self.assertEqual(len(d), n-i)
j = random.randrange(-len(d), len(d))
val = d[j]
self.assert_(val in d)
del d[j]
self.assert_(val not in d)
self.assertEqual(len(d), 0)
def test_rotate(self):
s = tuple('abcde')
n = len(s)
d = deque(s)
d.rotate(1) # verify rot(1)
self.assertEqual(''.join(d), 'eabcd')
d = deque(s)
d.rotate(-1) # verify rot(-1)
self.assertEqual(''.join(d), 'bcdea')
d.rotate() # check default to 1
self.assertEqual(tuple(d), s)
for i in xrange(n*3):
d = deque(s)
e = deque(d)
d.rotate(i) # check vs. rot(1) n times
for j in xrange(i):
e.rotate(1)
self.assertEqual(tuple(d), tuple(e))
d.rotate(-i) # check that it works in reverse
self.assertEqual(tuple(d), s)
e.rotate(n-i) # check that it wraps forward
self.assertEqual(tuple(e), s)
for i in xrange(n*3):
d = deque(s)
e = deque(d)
d.rotate(-i)
for j in xrange(i):
e.rotate(-1) # check vs. rot(-1) n times
self.assertEqual(tuple(d), tuple(e))
d.rotate(i) # check that it works in reverse
self.assertEqual(tuple(d), s)
e.rotate(i-n) # check that it wraps backaround
self.assertEqual(tuple(e), s)
d = deque(s)
e = deque(s)
e.rotate(BIG+17) # verify on long series of rotates
dr = d.rotate
for i in xrange(BIG+17):
dr()
self.assertEqual(tuple(d), tuple(e))
self.assertRaises(TypeError, d.rotate, 'x') # Wrong arg type
self.assertRaises(TypeError, d.rotate, 1, 10) # Too many args
d = deque()
d.rotate() # rotate an empty deque
self.assertEqual(d, deque())
def test_len(self):
d = deque('ab')
self.assertEqual(len(d), 2)
d.popleft()
self.assertEqual(len(d), 1)
d.pop()
self.assertEqual(len(d), 0)
self.assertRaises(IndexError, d.pop)
self.assertEqual(len(d), 0)
d.append('c')
self.assertEqual(len(d), 1)
d.appendleft('d')
self.assertEqual(len(d), 2)
d.clear()
self.assertEqual(len(d), 0)
def test_underflow(self):
d = deque()
self.assertRaises(IndexError, d.pop)
self.assertRaises(IndexError, d.popleft)
def test_clear(self):
d = deque(xrange(100))
self.assertEqual(len(d), 100)
d.clear()
self.assertEqual(len(d), 0)
self.assertEqual(list(d), [])
d.clear() # clear an emtpy deque
self.assertEqual(list(d), [])
def test_remove(self):
d = deque('abcdefghcij')
d.remove('c')
self.assertEqual(d, deque('abdefghcij'))
d.remove('c')
self.assertEqual(d, deque('abdefghij'))
self.assertRaises(ValueError, d.remove, 'c')
self.assertEqual(d, deque('abdefghij'))
# Handle comparison errors
d = deque(['a', 'b', BadCmp(), 'c'])
e = deque(d)
self.assertRaises(RuntimeError, d.remove, 'c')
for x, y in zip(d, e):
# verify that original order and values are retained.
self.assert_(x is y)
# Handle evil mutator
for match in (True, False):
d = deque(['ab'])
d.extend([MutateCmp(d, match), 'c'])
self.assertRaises(IndexError, d.remove, 'c')
self.assertEqual(d, deque())
def test_repr(self):
d = deque(xrange(200))
e = eval(repr(d))
self.assertEqual(list(d), list(e))
d.append(d)
self.assert_('...' in repr(d))
def test_print(self):
d = deque(xrange(200))
d.append(d)
test_support.unlink(test_support.TESTFN)
fo = open(test_support.TESTFN, "wb")
try:
print >> fo, d,
fo.close()
fo = open(test_support.TESTFN, "rb")
self.assertEqual(fo.read(), repr(d))
finally:
fo.close()
test_support.unlink(test_support.TESTFN)
def test_init(self):
self.assertRaises(TypeError, deque, 'abc', 2, 3);
self.assertRaises(TypeError, deque, 1);
def test_hash(self):
self.assertRaises(TypeError, hash, deque('abc'))
def test_long_steadystate_queue_popleft(self):
for size in (0, 1, 2, 100, 1000):
d = deque(xrange(size))
append, pop = d.append, d.popleft
for i in xrange(size, BIG):
append(i)
x = pop()
if x != i - size:
self.assertEqual(x, i-size)
self.assertEqual(list(d), range(BIG-size, BIG))
def test_long_steadystate_queue_popright(self):
for size in (0, 1, 2, 100, 1000):
d = deque(reversed(xrange(size)))
append, pop = d.appendleft, d.pop
for i in xrange(size, BIG):
append(i)
x = pop()
if x != i - size:
self.assertEqual(x, i-size)
self.assertEqual(list(reversed(list(d))), range(BIG-size, BIG))
def test_big_queue_popleft(self):
pass
d = deque()
append, pop = d.append, d.popleft
for i in xrange(BIG):
append(i)
for i in xrange(BIG):
x = pop()
if x != i:
self.assertEqual(x, i)
def test_big_queue_popright(self):
d = deque()
append, pop = d.appendleft, d.pop
for i in xrange(BIG):
append(i)
for i in xrange(BIG):
x = pop()
if x != i:
self.assertEqual(x, i)
def test_big_stack_right(self):
d = deque()
append, pop = d.append, d.pop
for i in xrange(BIG):
append(i)
for i in reversed(xrange(BIG)):
x = pop()
if x != i:
self.assertEqual(x, i)
self.assertEqual(len(d), 0)
def test_big_stack_left(self):
d = deque()
append, pop = d.appendleft, d.popleft
for i in xrange(BIG):
append(i)
for i in reversed(xrange(BIG)):
x = pop()
if x != i:
self.assertEqual(x, i)
self.assertEqual(len(d), 0)
def test_roundtrip_iter_init(self):
d = deque(xrange(200))
e = deque(d)
self.assertNotEqual(id(d), id(e))
self.assertEqual(list(d), list(e))
def test_pickle(self):
d = deque(xrange(200))
for i in range(pickle.HIGHEST_PROTOCOL + 1):
s = pickle.dumps(d, i)
e = pickle.loads(s)
self.assertNotEqual(id(d), id(e))
self.assertEqual(list(d), list(e))
## def test_pickle_recursive(self):
## d = deque('abc')
## d.append(d)
## for i in range(pickle.HIGHEST_PROTOCOL + 1):
## e = pickle.loads(pickle.dumps(d, i))
## self.assertNotEqual(id(d), id(e))
## self.assertEqual(id(e), id(e[-1]))
def test_deepcopy(self):
mut = [10]
d = deque([mut])
e = copy.deepcopy(d)
self.assertEqual(list(d), list(e))
mut[0] = 11
self.assertNotEqual(id(d), id(e))
self.assertNotEqual(list(d), list(e))
def test_copy(self):
mut = [10]
d = deque([mut])
e = copy.copy(d)
self.assertEqual(list(d), list(e))
mut[0] = 11
self.assertNotEqual(id(d), id(e))
self.assertEqual(list(d), list(e))
def test_reversed(self):
for s in ('abcd', xrange(2000)):
self.assertEqual(list(reversed(deque(s))), list(reversed(s)))
def test_gc_doesnt_blowup(self):
import gc
# This used to assert-fail in deque_traverse() under a debug
# build, or run wild with a NULL pointer in a release build.
d = deque()
for i in xrange(100):
d.append(1)
gc.collect()
class TestVariousIteratorArgs(unittest.TestCase):
def test_constructor(self):
for s in ("123", "", range(1000), ('do', 1.2), xrange(2000,2200,5)):
for g in (seq_tests.Sequence, seq_tests.IterFunc,
seq_tests.IterGen, seq_tests.IterFuncStop,
seq_tests.itermulti, seq_tests.iterfunc):
self.assertEqual(list(deque(g(s))), list(g(s)))
self.assertRaises(TypeError, deque, seq_tests.IterNextOnly(s))
self.assertRaises(TypeError, deque, seq_tests.IterNoNext(s))
self.assertRaises(ZeroDivisionError, deque, seq_tests.IterGenExc(s))
def test_iter_with_altered_data(self):
d = deque('abcdefg')
it = iter(d)
d.pop()
self.assertRaises(RuntimeError, it.next)
def test_runtime_error_on_empty_deque(self):
d = deque()
it = iter(d)
d.append(10)
self.assertRaises(RuntimeError, it.next)
class Deque(deque):
pass
class DequeWithBadIter(deque):
def __iter__(self):
raise TypeError
class TestSubclass(unittest.TestCase):
def test_basics(self):
d = Deque(xrange(25))
d.__init__(xrange(200))
for i in xrange(200, 400):
d.append(i)
for i in reversed(xrange(-200, 0)):
d.appendleft(i)
self.assertEqual(list(d), range(-200, 400))
self.assertEqual(len(d), 600)
left = [d.popleft() for i in xrange(250)]
self.assertEqual(left, range(-200, 50))
self.assertEqual(list(d), range(50, 400))
right = [d.pop() for i in xrange(250)]
right.reverse()
self.assertEqual(right, range(150, 400))
self.assertEqual(list(d), range(50, 150))
d.clear()
self.assertEqual(len(d), 0)
def test_copy_pickle(self):
d = Deque('abc')
e = d.__copy__()
self.assertEqual(type(d), type(e))
self.assertEqual(list(d), list(e))
e = Deque(d)
self.assertEqual(type(d), type(e))
self.assertEqual(list(d), list(e))
s = pickle.dumps(d)
e = pickle.loads(s)
self.assertNotEqual(id(d), id(e))
self.assertEqual(type(d), type(e))
self.assertEqual(list(d), list(e))
d = Deque('abcde', maxlen=4)
e = d.__copy__()
self.assertEqual(type(d), type(e))
self.assertEqual(list(d), list(e))
e = Deque(d)
self.assertEqual(type(d), type(e))
self.assertEqual(list(d), list(e))
s = pickle.dumps(d)
e = pickle.loads(s)
self.assertNotEqual(id(d), id(e))
self.assertEqual(type(d), type(e))
self.assertEqual(list(d), list(e))
## def test_pickle(self):
## d = Deque('abc')
## d.append(d)
##
## e = pickle.loads(pickle.dumps(d))
## self.assertNotEqual(id(d), id(e))
## self.assertEqual(type(d), type(e))
## dd = d.pop()
## ee = e.pop()
## self.assertEqual(id(e), id(ee))
## self.assertEqual(d, e)
##
## d.x = d
## e = pickle.loads(pickle.dumps(d))
## self.assertEqual(id(e), id(e.x))
##
## d = DequeWithBadIter('abc')
## self.assertRaises(TypeError, pickle.dumps, d)
def test_weakref(self):
d = deque('gallahad')
p = proxy(d)
self.assertEqual(str(p), str(d))
d = None
self.assertRaises(ReferenceError, str, p)
def test_strange_subclass(self):
class X(deque):
def __iter__(self):
return iter([])
d1 = X([1,2,3])
d2 = X([4,5,6])
d1 == d2 # not clear if this is supposed to be True or False,
# but it used to give a SystemError
class SubclassWithKwargs(deque):
def __init__(self, newarg=1):
deque.__init__(self)
class TestSubclassWithKwargs(unittest.TestCase):
def test_subclass_with_kwargs(self):
# SF bug #1486663 -- this used to erroneously raise a TypeError
SubclassWithKwargs(newarg=1)
#==============================================================================
libreftest = """
Example from the Library Reference: Doc/lib/libcollections.tex
>>> from collections import deque
>>> d = deque('ghi') # make a new deque with three items
>>> for elem in d: # iterate over the deque's elements
... print elem.upper()
G
H
I
>>> d.append('j') # add a new entry to the right side
>>> d.appendleft('f') # add a new entry to the left side
>>> d # show the representation of the deque
deque(['f', 'g', 'h', 'i', 'j'])
>>> d.pop() # return and remove the rightmost item
'j'
>>> d.popleft() # return and remove the leftmost item
'f'
>>> list(d) # list the contents of the deque
['g', 'h', 'i']
>>> d[0] # peek at leftmost item
'g'
>>> d[-1] # peek at rightmost item
'i'
>>> list(reversed(d)) # list the contents of a deque in reverse
['i', 'h', 'g']
>>> 'h' in d # search the deque
True
>>> d.extend('jkl') # add multiple elements at once
>>> d
deque(['g', 'h', 'i', 'j', 'k', 'l'])
>>> d.rotate(1) # right rotation
>>> d
deque(['l', 'g', 'h', 'i', 'j', 'k'])
>>> d.rotate(-1) # left rotation
>>> d
deque(['g', 'h', 'i', 'j', 'k', 'l'])
>>> deque(reversed(d)) # make a new deque in reverse order
deque(['l', 'k', 'j', 'i', 'h', 'g'])
>>> d.clear() # empty the deque
>>> d.pop() # cannot pop from an empty deque
Traceback (most recent call last):
File "<pyshell#6>", line 1, in -toplevel-
d.pop()
IndexError: pop from an empty deque
>>> d.extendleft('abc') # extendleft() reverses the input order
>>> d
deque(['c', 'b', 'a'])
>>> def delete_nth(d, n):
... d.rotate(-n)
... d.popleft()
... d.rotate(n)
...
>>> d = deque('abcdef')
>>> delete_nth(d, 2) # remove the entry at d[2]
>>> d
deque(['a', 'b', 'd', 'e', 'f'])
>>> def roundrobin(*iterables):
... pending = deque(iter(i) for i in iterables)
... while pending:
... task = pending.popleft()
... try:
... yield task.next()
... except StopIteration:
... continue
... pending.append(task)
...
>>> for value in roundrobin('abc', 'd', 'efgh'):
... print value
...
a
d
e
b
f
c
g
h
>>> def maketree(iterable):
... d = deque(iterable)
... while len(d) > 1:
... pair = [d.popleft(), d.popleft()]
... d.append(pair)
... return list(d)
...
>>> print maketree('abcdefgh')
[[[['a', 'b'], ['c', 'd']], [['e', 'f'], ['g', 'h']]]]
"""
#==============================================================================
__test__ = {'libreftest' : libreftest}
def test_main(verbose=None):
import sys
test_classes = (
TestBasic,
TestVariousIteratorArgs,
TestSubclass,
TestSubclassWithKwargs,
)
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
# doctests
from test import test_deque
test_support.run_doctest(test_deque, verbose)
if __name__ == "__main__":
test_main(verbose=True)
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