Well*
*result = [(ListA[i] - ListB[i-1])/ListA[i] for i in range(len(ListA))*if
not ListA[i] == 0*]
will exclude any results where listA[i] is 0, if you still want these in the
result
you may want to use good'ol for statement instead of list comprehension
results = []
for x in range(len(listA)):
y = ListA[i] - ListB[i-1]
if not ListA[i] == 0:
y = y / ListA[i]
results.append(y)
print results
Vince
On Fri, Jun 19, 2009 at 8:55 AM, Joe Python <jopyt...@gmail.com> wrote:
> I have a generator as follows to do list calculations.
>
> *result = [(ListA[i] - ListB[i-1])/ListA[i] for i in range(len(ListA))]*
>
> The above generator, throws '*ZeroDivisionError*' exception if ListA[i] =
> 0.
> Is there a way to say 'Don't divide by ListA[i] if its equal to 0 (within
> that statement)'.
>
> Sorry if this question sounds too stupid.
>
> TIA
> Joe
>
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> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
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