On Fri, Jan 30, 2009 at 5:33 PM, Vincent Davis <vinc...@vincentdavis.net> wrote:
> Z=[[x for y in range(1,2) if AList[x]==y] for x in range(0,5)]
> I am not sure how to ask this but which "for" is looped first? I could
> test but was wondering if there was a nice explanation I could apply
> to future situations.
The outer one. Remember that you can always rewrite (a) list
comprehension(s) into (an) equivalent for-loop(s). In this case:
Z = []
for x in range(0,5):
_tmp = []
for y in range(1,2):
if AList[x]==y:
_tmp.append(x)
Z.append(_tmp)
Or alternatively, imagine if the inner list comprehension was instead
a function call:
#assuming AList is a global var
def inner_list_comp(x):
return [x for y in range(1,2) if AList[x]==y]
Z=[inner_list_comp(x) for x in range(0,5)]
Cheers,
Chris
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