Finding the index of an item in a list

Question

Given a list [\"foo\", \"bar\", \"baz\"] and an item in the list \"bar\", how do I get its index (1) in Python?

Answer 1

As indicated by @TerryA, many answers discuss how to find one index.

more_itertools is a third-party library with tools to locate multiple indices within an iterable.

Given

import more_itertools as mit


iterable = ["foo", "bar", "baz", "ham", "foo", "bar", "baz"]

Code

Find indices of multiple observations:

list(mit.locate(iterable, lambda x: x == "bar"))
# [1, 5]

Test multiple items:

list(mit.locate(iterable, lambda x: x in {"bar", "ham"}))
# [1, 3, 5]

See also more options with more_itertools.locate. Install via > pip install more_itertools.