my_list.index(element) returns the index of the element using common comparision (as in == or __eq__() or __cmp__()). If you need to find an element on the list using identity comparing (is) then this function can do it for you
| Python |
1 2 | def index_id(a_list, elem):
return (index for index, item in enumerate(a_list) if item is elem).next()
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Discussion
This approach iterates on the list until it finds the first element that matches and returns it without searching the rest of the list.
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