Unused variable in python enumerate

Question

Im using enumerate to obtain the indexes in a list ("i"), but I don't need the value of every element ("j"). "j" is unused in my code, so this is a warning in the eclipse IDE. How I can fix this?

Code:

for i,j in enumerate(my_list):

This question is unclear. What is it exactly you are trying to do? What exactly is the error that you are seeing? Please provide a working example that reproduces the error. — wesanyer
– wesanyer, Commented Feb 14, 2017 at 13:27
What @WillemVanOnsem said or for i, _ in enumerate(my_list) if you are talking about a warning by your IDE — user2390182
– user2390182, Commented Feb 14, 2017 at 13:27
@schwobaseggl: this is indeed semantically equivalent, but less efficient since here you do not do tuple packing, unpacking, reference counting, etc. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Feb 14, 2017 at 13:29
@WillemVanOnsem I am aware. But as a general remark as there are other cases where you do not use a value that is returned by a function, e.g. instance, _ = Foo.objects.get_or_create(...) — user2390182
– user2390182, Commented Feb 14, 2017 at 13:30

Emmanuel Arias · Accepted Answer · 2017-02-14 13:32:48Z

1

If you want just the index, you can use:

my_index = [i for i in range(len(mylist))]

answered Feb 14, 2017 at 13:32

Emmanuel Arias

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holdenweb · Accepted Answer · 2017-02-14 13:29:48Z

1

Just because an IDE gives you a warning that doesn't mean you have to change your code. @WillemVanOnsem gives you the necessary solution to iterating over the indexes in his comment.

answered Feb 14, 2017 at 13:29

holdenweb

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