def test_is_hashable():
# all new-style classes are hashable by default
class HashableClass(object):
pass
class UnhashableClass1(object):
__hash__ = None
class UnhashableClass2(object):
def __hash__(self):
raise TypeError("Not hashable")
hashable = (
1,
'a',
tuple(),
(1, ),
HashableClass(),
)
not_hashable = (
[],
UnhashableClass1(),
)
abc_hashable_not_really_hashable = (
([], ),
UnhashableClass2(),
)
for i in hashable:
assert isinstance(i, collections.Hashable)
assert com.is_hashable(i)
for i in not_hashable:
assert not isinstance(i, collections.Hashable)
assert not com.is_hashable(i)
for i in abc_hashable_not_really_hashable:
assert isinstance(i, collections.Hashable)
assert not com.is_hashable(i)
# numpy.array is no longer collections.Hashable as of
# https://github.com/numpy/numpy/pull/5326, just test
# pandas.common.is_hashable()
assert not com.is_hashable(np.array([]))
# old-style classes in Python 2 don't appear hashable to
# collections.Hashable but also seem to support hash() by default
if sys.version_info[0] == 2:
class OldStyleClass():
pass
c = OldStyleClass()
assert not isinstance(c, collections.Hashable)
assert not com.is_hashable(c)
hash(c) # this will not raise
def test_is_hashable():
# all new-style classes are hashable by default
class HashableClass(object):
pass
class UnhashableClass1(object):
__hash__ = None
class UnhashableClass2(object):
def __hash__(self):
raise TypeError("Not hashable")
hashable = (1,
3.14,
np.float64(3.14),
'a',
tuple(),
(1, ),
HashableClass(), )
not_hashable = ([], UnhashableClass1(), )
abc_hashable_not_really_hashable = (([], ), UnhashableClass2(), )
for i in hashable:
assert com.is_hashable(i)
for i in not_hashable:
assert not com.is_hashable(i)
for i in abc_hashable_not_really_hashable:
assert not com.is_hashable(i)
# numpy.array is no longer collections.Hashable as of
# https://github.com/numpy/numpy/pull/5326, just test
# pandas.common.is_hashable()
assert not com.is_hashable(np.array([]))
# old-style classes in Python 2 don't appear hashable to
# collections.Hashable but also seem to support hash() by default
if compat.PY2:
class OldStyleClass():
pass
c = OldStyleClass()
assert not isinstance(c, collections.Hashable)
assert com.is_hashable(c)
hash(c) # this will not raise
