python get index of all item in list code example

Example 1: get all occurrence indices in list python

a_list = [1, 2, 3, 1]

indices = []
for i in range(len(a_list)):
   if a_list[i] == 1:
      indices.append(i)

# more concise way
a_list = [1, 2, 3, 1]
indices = [index for index, element in enumerate(a_list) if element == 1]

Example 2: get index of list python

list.index(element)

Example 3: how to find item in list python without indexnig

>>> ["foo", "bar", "baz"].index("bar")
1

Example 4: get index of item in list

list.index(element, start, end)