Question

With the following example list: L = ['a','b','c','d']

I’d like to achieve the following output:

>>> a d b
>>> b a c
>>> c b d
>>> d c a

Pseudo-code would be:

for e in L:
    print(e, letter_before_e, letter_after_e

Answer 1

You’re pretty much there

for i, e in enumerate(L):
    print(e, L[i-1], L[(i+1) % len(L)])

EDITED to add mod