Test for the weekend using C-style time constructs in Python

gistfile1.py

import time

def is_weekend(date, date_is_timestamp=False, format='%Y-%m-%d'):
    """
    Check to see if a date falls on a weekend.

    You can pass in date as a string. By default, is_weekend expects to see
    a date in the format YYYY-mm-dd (ex. 2011-11-10). You can change this
    using the strftime(3) format specifiers and passing the format in the
    'format' argument.

    You can also use a UNIX timestamp. If so, format is ignored and you
    should set the 'date_is_timestamp' argument to True.

    This demonstrates using the C time functions strptime, mktime, etc...
    to determine whether it's the weekend. An easier method might be the
    calender module.
    """

    if date_is_timestamp:
        fmt = '%c'
        day = time.strptime(time.asctime(time.localtime(date)), '%c')
    else:
        day = time.strptime(date, format)
    
    day = time.strftime('%a', day)
    if 'Sat' == day or 'Sun' == day:
        return True
    else:
        return False