list and index in python code example
Example 1: python find index by value
>>> ["foo", "bar", "baz"].index("bar")
1
Example 2: get index of item in list
list.index(element, start, end)
Example 3: python index list in list
>>> list1 = [[10,13,17],[3,5,1],[13,11,12]]
>>> list1[0][2]
17