Insert element in Python list after every nth element

Question

Say I have a Python list like this:

letters = [\'a\',\'b\',\'c\',\'d\',\'e\',\'f\',\'g\',\'h\',\'i\',\'j\']

I want to insert an \'x\' after

Answer 1

I want to add a new element per item.

How about this ?

a=[2,4,6]
for b in range (0,len(a)):
    a.insert(b*2,1)

a is now

[1, 2, 1, 4, 1, 6]