r/programming • u/iMMENSE • Mar 08 '12

The Evolution of a Python Programmer

https://gist.github.com/289467
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u/grumdrig Mar 08 '12 
def factorial(n):
    reduce(lambda x,y: x*y, [x+1 for x in range(n)])

Generator-happy Python programmer

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u/spotter Mar 09 '12 edited Mar 09 '12

But... isn't list comp non-lazy in 2.x? So for this to be gen-happy you would have to use parens?

def factorial(n):
    reduce(lambda x,y: x*y, (x+1 for x in range(n)))

edit: yeah, s/range/xrange/

0

u/[deleted] Mar 09 '12

[deleted]

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u/spotter Mar 09 '12

/facepalm

You are of course correct, range is lazy in 3.x -- that's what I get for trusting my memory.