DavidAntliff

def coerce_iterable(scalar_or_sequence):
    """If scalar_or_sequence is not iterable, wrap it so that the return value is."""
    try:
        _ = tuple(x for x in scalar_or_sequence)
        result = scalar_or_sequence
    except TypeError:
        # The user has probably specified a single entity and forgotten to
        # define it as a proper tuple, so be friendly and handle as a scalar instance:
        result = (scalar_or_sequence,)
    return result

DavidAntliff

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()

DavidAntliff

"""
Copyright 2016 David Antliff; this file is licensed under the terms of the Apache license version 2.0. For a full copy of the license, see https://www.apache.org/licenses/LICENSE-2.0

Accept two styles of repeated options on the command line.

Style 1 - each instance repeats the option itself. E.g.

  $ python prog --option A --option B

Style 2 - each instance occurs after a single instance of the option. E.g.