loading
open in
main.py
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from operator import mul
d = map(int, ''.join(line.rstrip() for line in open('pe8.txt')))

L = input('Enter a set length? ')
print 'Greatest product of', L, 'consecutive digits =', 
print "None."  if L>len(d) else  \
            max(reduce(mul, d[i:i+L]) for i in xrange(len(d)-L+1))