Group consecutive equal items of iterable

group_equal.py

# Group equal consecutive items of iterable.
#
#
# Sample usage:
#
#     >>> group_equal('aaabbcd')
#     [['a', 'a', 'a'], ['b', 'b'], ['c'], ['d']]
#
def group_equal(iterable):
    subgroups = []

    g = []
    for item in iterable:
        if not g or item == g[0]:
            g.append(item)
        else:
            subgroups.append(g)
            g = [item]

    if g:
        subgroups.append(g)

    return subgroups