# From Python 3.4 mailcap
def readmailcapfile(caps):
    while 1:
        line = 'abc'
        if line[0] == '#' or line == '':
            continue
        key, fields = (1,2)
        if not (key and fields):
            continue
        if key in caps:
            caps[key].append(fields)
        else:
            caps[key] = [fields]
    return caps