[ x for x in xrange(10) when p(x) ]

bonono at gmail.com bonono at gmail.com
Thu Nov 10 04:47:47 CET 2005

Alex Martelli wrote:
> This becomes a valid list comprehension by writing 'if' instead of
> 'when'.
valid, yes. efficient, I am not sure.

[ x for x in xrange(10000000) if p(x) ]

means I need to go through the whole range even if p = lambda x: x < 2.

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