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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 itertools
# Fallback for Python 2.4, Python 2.5
def product(*args, **kwds):
"""
Taken from http://docs.python.org/library/itertools.html#itertools.product
"""
# product('ABCD', 'xy') --> Ax Ay Bx By Cx Cy Dx Dy
# product(range(2), repeat=3) --> 000 001 010 011 100 101 110 111
pools = map(tuple, args) * kwds.get('repeat', 1)
result = [[]]
for pool in pools:
result = [x+[y] for x in result for y in pool]
for prod in result:
yield tuple(prod)
if hasattr(itertools, 'product'):
product = itertools.product
def is_iterable(x):
"A implementation independent way of checking for iterables"
try:
iter(x)
except TypeError:
return False
else:
return True
def all(iterable):
for item in iterable:
if not item:
return False
return True
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