Is there a way to find index of "in" keyword match in python

Question

The title of this post is probably pretty vague. Here is what I need to know

If I use something like

if x in list

how do I find the index in the list where a match occurs?

Answer 1

You can't get that from in itself. For lists, you can use the index method:

>>> [1, 2, 5, 8, -1, 2].index(2)
1

This will raise an exception if the item is not in the list. Note that it returns the index of the first occurrence. It might occur multiple times.