How I can find array in array

Question

Hi all, 

How I can find an array in an array, for example

Arr_all = [hi, hello, hi,hi]

Search_arr = [hi,hi]

Return start index 2

Answer 1

I guess the given below will b easy to understand:

>>> a, b = ["hi", "hello", "hi", "hi"], ["hi", "hi"]
>>> [i for i in range(len(a)) if a[i: i+len(b)] == b]
[2]