from typing import Iterable

def split(delim: str, s: str) -> Iterable[str]:
    while len(s):
        idx = s.find(delim)
        if idx == -1: idx = len(s)
        yield s[:idx]
        s = s[idx + len(delim):]

for x in split(", ", "Aberdeen, Dundee, Edinburgh, Glasgow"): print(x)

# Swap M and D names in the definitions
d, m, y = tuple(split("/", "11/9/2001"))
print(f"Day = {d}, Month = {m}, Year = {y}")