Classes and functions

As another example of a user-defined type, we’ll define a class called Time that records the time of day. The class definition looks like this:

                       

Write a function print_time that takes a Time object and prints it in the form hour:minute:second.

Write a Boolean function after that takes two Time objects, t1 and t2, and returns true if t1 follows t2 chronologically and False otherwise.

class Time:
    """ represents the time of day
        attributes: hour, minute, second"""
    def print_time(self):
        print('%d:%d:%d' % (self.hour,self.minute,self.second))
    def after(self,t):
        if(self.hour < t.hour):
            return False
        elif(self.hour == t.hour):
            if(self.minute < t.minute):
                return False
            elif(self.minute == t.minute):
                if(self.second <= t.second):
                    return False
                else: return True
        return True


time = Time()
time.hour = 11
time.minute = 59
time.second = 30
time1 = Time()
time1.hour = 11
time1.minute = 59
time1.second = 36
time2 = Time()
time2.hour = 11
time2.minute = 58
time2.second = 55

from Thinking in Python