Source code for Time

"""
Class for storing time related information. Even though it 
is initialized with hour, minute and second information, 
it keeps time in seconds as a member value.
"""

class Time(object):
    def __init__(self, h, m, s):
        self.seconds = s + m*60 + h*60*60

    def convert(self):
        """Return the hour, minute and second corresponding to the time value of the object. 
        
        """
        
        h = self.seconds/(3600)
        m = (self.seconds - h*3600)/60
        s = self.seconds - h*3600 - m*60
        return (h,m,s)
    
    def __sub__(self, other):
        """Subtract two times from each other and return
        a new time object.
        
        """
        
        (h,m,s) = self.convert()
        newt = Time(h,m,s)
        newt.seconds -= other.seconds
        if newt.seconds < 0 :
            newt.seconds = 0
        return newt
    
    def timestr(self,val):
        if val < 10:
            return "0" + str(val)
        else:
            return str(val)
    
    def __str__(self):
        (h,m,s) = self.convert()
        return '%s:%s:%s' %(self.timestr(h),\
                            self.timestr(m),\
                            self.timestr(s))
    
if __name__ == "__main__":
    ##Code to test the class
    
    p1 = Time(10, 3, 4)
    p2 = Time(12, 10, 3)
    print "p1:", p1
    print "p2:", p2
    print "p1-p2:", p1 - p2
    print "p2-p1:", p2 - p1