Python: partition a string with a set of delimiters

partition_by_set.py

import re

def partition(string, delimiters):
    """Split a string into a (head, sep, tail) tuple based on the
    first occurrence of a delimiter in the string.
    This is similar to str.partition() except it accepts a set of delimiters.
    The set can be a list/tuple of characters, or a string."""
    seps = "".join(delimiters)
    return re.match(r"([^{seps}]*)([{seps}]?)(.*)".format(seps=seps), string).groups()