Re: pythonize this!

[superpollo]

superpollo ha scritto:

Peter Otten ha scritto:

superpollo wrote:

goal (from e.c.m.): evaluate
1^2+2^2+3^2-4^2-5^2+6^2+7^2+8^2-9^2-10^2+...-2010^2, where each three
consecutive + must be followed by two - (^ meaning ** in this context)

from itertools import cycle, izip
sum(sign*i*i for sign, i in izip(cycle([1]*3+[-1]*2), range(1, 2011)))

536926141

don't understand it bit i like this a lot!

                      ^^^

*but*
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