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Reversed UserLists are not required to support __length_hint__.

This commit is contained in:
Raymond Hettinger 2008-02-06 22:45:43 +00:00
parent 6cc14a05d2
commit 2f653c19f4
1 changed files with 0 additions and 40 deletions
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40
Lib/test/test_iterlen.py
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@ -45,7 +45,6 @@ import unittest
from test import test_support
from itertools import repeat
from collections import deque
from UserList import UserList
from builtins import len as _len
n = 10
@ -196,43 +195,6 @@ class TestListReversed(TestInvariantWithoutMutations):
d.extend(range(20))
self.assertEqual(len(it), 0)
class TestSeqIter(TestInvariantWithoutMutations):
def setUp(self):
self.it = iter(UserList(range(n)))
def test_mutation(self):
d = UserList(range(n))
it = iter(d)
next(it)
next(it)
self.assertEqual(len(it), n-2)
d.append(n)
self.assertEqual(len(it), n-1) # grow with append
d[1:] = []
self.assertEqual(len(it), 0)
self.assertEqual(list(it), [])
d.extend(range(20))
self.assertEqual(len(it), 0)
class TestSeqIterReversed(TestInvariantWithoutMutations):
def setUp(self):
self.it = reversed(UserList(range(n)))
def test_mutation(self):
d = UserList(range(n))
it = reversed(d)
next(it)
next(it)
self.assertEqual(len(it), n-2)
d.append(n)
self.assertEqual(len(it), n-2) # ignore append
d[1:] = []
self.assertEqual(len(it), 0)
self.assertEqual(list(it), []) # confirm invariant
d.extend(range(20))
self.assertEqual(len(it), 0)
def test_main():
@ -249,8 +211,6 @@ def test_main():
TestSet,
TestList,
TestListReversed,
TestSeqIter,
TestSeqIterReversed,
]
test_support.run_unittest(*unittests)