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from _collections import deque
import gc
#from AppTestW_IterObjectApp
def test_user_iter():
class C(object):
def __next__(self):
raise StopIteration
def __iter__(self):
return self
assert list(C()) == []
def test_iter_getitem():
class C(object):
def __getitem__(self, i):
return range(2)[i]
assert list(C()) == list(range(2))
def test_iter_fail_noseq():
class C(object):
pass
raises(TypeError,
iter,
C())
#from AppTest_IterObject
def test_no_len_on_list_iter():
iterable = [1,2,3,4]
raises(TypeError, len, iter(iterable))
def test_list_iter_setstate():
iterable = iter([1,2,3,4])
assert next(iterable) == 1
iterable.__setstate__(0)
assert next(iterable) == 1
iterable.__setstate__(-100)
assert next(iterable) == 1
raises(TypeError, iterable.__setstate__, '0')
def test_reversed_iter_setstate():
iterable = reversed([1,2,3,4])
assert next(iterable) == 4
iterable.__setstate__(0)
assert next(iterable) == 1
iterable.__setstate__(2)
next(iterable); next(iterable)
assert next(iterable) == 1
iterable.__setstate__(3)
assert next(iterable) == 4
iterable.__setstate__(-1)
raises(StopIteration, next, iterable)
#
iterable = reversed([1,2,3,4])
iterable.__setstate__(-100)
raises(StopIteration, next, iterable)
#
iterable = reversed([1,2,3,4])
iterable.__setstate__(100)
assert next(iterable) == 4
assert next(iterable) == 3
def test_forward_iter_reduce():
T = "abc"
iterable = iter(T)
assert iterable.__reduce__() == (iter, (T, ), 0)
assert next(iterable) == "a"
assert iterable.__reduce__() == (iter, (T, ), 1)
assert next(iterable) == "b"
assert iterable.__reduce__() == (iter, (T, ), 2)
assert next(iterable) == "c"
assert iterable.__reduce__() == (iter, (T, ), 3)
raises(StopIteration, next, iterable)
assert (iterable.__reduce__() == (iter, ((), )) or # pypy
iterable.__reduce__() == (iter, ("", ))) # cpython
def test_reversed_iter_reduce():
T = [1, 2, 3, 4]
iterable = reversed(T)
assert iterable.__reduce__() == (reversed, (T, ), 3)
assert next(iterable) == 4
assert iterable.__reduce__() == (reversed, (T, ), 2)
assert next(iterable) == 3
assert iterable.__reduce__() == (reversed, (T, ), 1)
assert next(iterable) == 2
assert iterable.__reduce__() == (reversed, (T, ), 0)
assert next(iterable) == 1
assert iterable.__reduce__() == (reversed, (T, ), -1)
raises(StopIteration, next, iterable)
assert (iterable.__reduce__() == (iter, ((), )) or # pypy
iterable.__reduce__() == (iter, ([], ))) # cpython
def test_no_len_on_tuple_iter():
iterable = (1,2,3,4)
raises(TypeError, len, iter(iterable))
def test_no_len_on_deque_iter():
iterable = deque([1,2,3,4])
raises(TypeError, len, iter(iterable))
def test_no_len_on_reversed():
it = reversed("foobar")
raises(TypeError, len, it)
def test_no_len_on_reversed_seqiter():
# this one fails on CPython. See http://bugs.python.org/issue3689
it = reversed([5,6,7])
raises(TypeError, len, it)
def test_no_len_on_UserList_iter():
class UserList(object):
def __init__(self, i):
self.i = i
def __getitem__(self, i):
return range(self.i)[i]
iterable = UserList([1,2,3,4])
raises(TypeError, len, iter(iterable))
def test_no_len_on_UserList_iter_reversed():
class UserList(object):
def __init__(self, i):
self.i = i
def __getitem__(self, i):
return range(self.i)[i]
iterable = UserList([1,2,3,4])
raises(TypeError, len, iter(iterable))
raises(TypeError, reversed, iterable)
def test_no_len_on_UserList_reversed():
iterable = [1,2,3,4]
raises(TypeError, len, reversed(iterable))
def test_reversed_frees_empty():
for typ in list, str:
free = [False]
class U(typ):
def __del__(self):
free[0] = True
r = reversed(U())
raises(StopIteration, next, r)
gc.collect(); gc.collect(); gc.collect()
assert free[0]
def test_reversed_mutation():
n = 10
d = list(range(n))
it = reversed(d)
next(it)
next(it)
assert it.__length_hint__() == n-2
d.append(n)
assert it.__length_hint__() == n-2
d[1:] = []
assert it.__length_hint__() == 0
assert list(it) == []
d.extend(range(20))
assert it.__length_hint__() == 0
def test_no_len_on_set_iter():
iterable = set([1,2,3,4])
raises(TypeError, len, iter(iterable))
def test_no_len_on_xrange():
iterable = range(10)
raises(TypeError, len, iter(iterable))
def test_contains():
logger = []
class Foo(object):
def __init__(self, value, name=None):
self.value = value
self.name = name or value
def __repr__(self):
return '<Foo %s>' % self.name
def __eq__(self, other):
logger.append((self, other))
return self.value == other.value
foo1, foo2, foo3 = Foo(1), Foo(2), Foo(3)
foo42 = Foo(42)
foo_list = [foo1, foo2, foo3]
foo42 in (x for x in foo_list)
logger_copy = logger[:] # prevent re-evaluation during pytest error print
assert logger_copy == [(foo1, foo42), (foo2, foo42), (foo3, foo42)]
del logger[:]
foo2_bis = Foo(2, '2 bis')
foo2_bis in (x for x in foo_list)
logger_copy = logger[:] # prevent re-evaluation during pytest error print
assert logger_copy == [(foo1, foo2_bis), (foo2, foo2_bis)]
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