how to split word by letter to letter in python code example

Example 1: python split word into letter pairs

string = 'ABCDXY'
[string[i:i+2] for i in xrange(0, len(string), 2)]

Example 2: python split word into letter pairs

s = 'abcdef'
L = zip(s[::2], s[1::2])
# -> [('a', 'b'), ('c', 'd'), ('e', 'f')]