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Code example from Think Python, by Allen B. Downey.
Available from http://thinkpython.com
Copyright 2012 Allen B. Downey.
Distributed under the GNU General Public License at gnu.org/licenses/gpl.html.
class Time(object):
    """Represents the time of day.
    attributes: hour, minute, second
    def __init__(self, hour=0, minute=0, second=0):
        minutes = hour * 60 + minute
        self.seconds = minutes * 60 + second
    def __str__(self):
        minutes, second = divmod(self.seconds, 60)
        hour, minute = divmod(minutes, 60)
        return '%.2d:%.2d:%.2d' % (hour, minute, second)
    def print_time(self):
        print str(self)
    def time_to_int(self):
        """Computes the number of seconds since midnight."""
        return self.seconds
    def is_after(self, other):
        """Returns True if t1 is after t2; false otherwise."""
        return self.seconds > other.seconds
    def __add__(self, other):
        """Adds two Time objects or a Time object and a number.
        other: Time object or number of seconds
        """
        if isinstance(other, Time):
            return self.add_time(other)
        else:
            return self.increment(other)
    def __radd__(self, other):
        """Adds two Time objects or a Time object and a number."""
        return self.__add__(other)
    def add_time(self, other):
        """Adds two time objects."""
        assert self.is_valid() and other.is_valid()
        seconds = self.seconds + other.seconds
        return int_to_time(seconds)
    def increment(self, seconds):
        """Returns a new Time that is the sum of this time and seconds."""
        seconds += self.seconds
        return int_to_time(seconds)
    def is_valid(self):
        """Checks whether a Time object satisfies the invariants."""
        return self.seconds >= 0 and self.seconds < 24*60*60
def int_to_time(seconds):
    """Makes a new Time object.
    seconds: int seconds since midnight.
    return Time(0, 0, seconds)
def main():
    start = Time(9, 45, 00)
    start.print_time()
    end = start.increment(1337)
    end.print_time()
    print 'Is end after start?',
    print end.is_after(start)
    print 'Using __str__'
    print start, end
    start = Time(9, 45)
    duration = Time(1, 35)
    print start + duration
    print start + 1337
    print 1337 + start
    print 'Example of polymorphism'
    t1 = Time(7, 43)
    t2 = Time(7, 41)
    t3 = Time(7, 37)
    total = sum([t1, t2, t3])
    print total
if __name__ == '__main__':

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