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all permutations python
<![CDATA[import itertools
print(list(itertools.permutations([1,2,3])))]]>
python permutation
<![CDATA[import itertools
a = [1, 2, 3]
n = 3
perm_iterator = itertools.permutations(a, n)
for item in perm_iterator:
print(item)]]>
permutation python
<![CDATA[def permutations(s):
if len(s) <= 1:
yield s
else:
for i in range(len(s)):
for p in permutations(s[:i] + s[i+1:]):
yield s[i] + p
input = 'ABCD'
for permutation in enumerate(permutations(input)):
print repr(permutation[1]),
print]]>
python combinations function
<![CDATA[def combinations(iterable, r):
pool = tuple(iterable)
n = len(pool)
for indices in permutations(range(n), r):
if sorted(indices) == list(indices):
yield tuple(pool[i] for i in indices)]]>
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