import operator
def factorial(n):
"""Calculate n factorial"""
return reduce(operator.mul, range(2, n+1), 1)
def intersection(*sets):
"""Get the intersection of all input sets"""
return reduce(set.intersection, sets)
def union(*sets):
"""Get the union of all input sets"""
return reduce(set.union, sets)
def join(*seqs):
"""Join any input sequences that support concatenation"""
return reduce(operator.concat, seqs)
"""
Some usage:
>>> factorial(3)
6
>>> factorial(10)
3628800
>>> a = set([1, 2, 3, 4, 5])
>>> b = set([5, 6, 3, 7])
>>> c = set([8, 7, 5])
>>> intersection(a, b, c)
set([5])
>>> union(a, b, c)
set([1, 2, 3, 4, 5, 6, 7, 8])
>>> join("one", "two", "three", "four")
'onetwothreefour'
>>> join([1, 2, 3], [5, 6], [6, 7])
[1, 2, 3, 4, 5, 6, 7]
"""
