Iterate over a string 2 (or n) characters at a time in Python

Question

Earlier today I needed to iterate over a string 2 characters at a time for parsing a string formatted like \"+c-R+D-E\" (there are a few extra letters).

Answer 1

Triptych inspired this more general solution:

def slicen(s, n, truncate=False):
    assert n > 0
    while len(s) >= n:
        yield s[:n]
        s = s[n:]
    if len(s) and not truncate:
        yield s

for op, code in slicen("+c-R+D-e", 2):
    print op,code