Horta wrote:
> On Feb 9, 9:00 am, Stephan Diehl <[EMAIL PROTECTED]> wrote:
>> Horta wrote:
>>> Hi folks,
>>> Suppose I have to loop over 3 lists being the same size at the same
>>> time and order. How can I do that without using the range() function
>>> or whatever indexing?
>>> Example using range:
>>> a = ['aaa', 'aaaa']
>>> b = ['bb', 'bbbb']
>>> c = ['c', 'cccc']
>>> for i in range(len(a)):
>>> # using a[i], b[i], and c[i]
>>> I'm sure there's a elegant way to do that...
>>> Thanks in advance.
>> Sure, there is:
>>
>> for a_item, b_item , c_item in zip(a,b,c):
>> # do something
>
> Thanks guys!
>
Note: if lists are long take a look at itertools izip. zip creates
a list of lists which could take lots of memory/time if they are VERY
large. itertools izip iterates over them in place.
from itertools import izip
for a_item, b_item, c_item in izip(a,b,c):
# do something
-Larry
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