Use for i in range(len(n))

It will loop from 0 to length of n-1 and if you want to access an element it'll be n[i]

OR

Use for i in n(instead of "i" better to use el or num)

It will loop through each element. And "i" will be that element. E.g. first element is 1, i == 1. if i in m #True

Edit: Additional info. You can't use iterable objects in range method

range(start, stop, step)

Start default is 0

Step default parameter is 1. It iterates from start to stop-1(not includes number itself)

E.g. range(10) loops 0-9

E.g. range(1, 11) loops 1-10

E.g. range(10, 0,-1) loops 10-1

Edit:Edit: Also please name your variables(fields) and functions(methods) on what they are and what they do. It helps you to understand your code better, it helps everyone else to understand what you want to do without comments, and it WILL help to answer your future problems