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"""
Providing iterator functions that are not in all version of Python we support.
Where possible, we try to use the system-native version and only fall back to
these implementations if necessary.
"""
import collections
import itertools
import sys
import warnings
def is_iterable(x):
"A implementation independent way of checking for iterables"
try:
iter(x)
except TypeError:
return False
else:
return True
def is_iterator(x):
"""An implementation independent way of checking for iterators
Python 2.6 has a different implementation of collections.Iterator which
accepts anything with a `next` method. 2.7+ requires and `__iter__` method
as well.
"""
if sys.version_info >= (2, 7):
return isinstance(x, collections.Iterator)
return isinstance(x, collections.Iterator) and hasattr(x, '__iter__')
def product(*args, **kwds):
warnings.warn("django.utils.itercompat.product is deprecated; use the native version instead",
DeprecationWarning, stacklevel=2)
return itertools.product(*args, **kwds)
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