On Thu, May 13, 2010 at 8:45 AM, a <oxfordenergyservi...@googlemail.com> wrote: > On 13 May, 16:19, Tim Chase <python.l...@tim.thechases.com> wrote: >> On 05/13/2010 09:36 AM, a wrote: >> >> > this must be easy but its taken me a couple of hours already >> >> > i have >> >> > a=[2,3,3,4,5,6] >> >> > i want to know the indices where a==3 (ie 1 and 2) >> >> indexes = [i for (i, v) in enumerate(a) where v==3] >> >> > then i want to reference these in a >> >> In a _what_? You can then do things like >> >> for i in indexes: >> print a[i] >> >> (but you already know these are "3", so it's not very exciting...) >> >> -tkc > > really its to get the indexes in 1 array where something equals > something then reference these in another array. > -- > http://mail.python.org/mailman/listinfo/python-list >
Out of curiosity, why are you using two arrays? Have you considered a dict? There are of course good reasons not to use a dict in this situation, but you haven't said one way or another. Carey -- http://mail.python.org/mailman/listinfo/python-list
