timeIntervals.md

class Interval:
       
    def __init__(self, hours=0, minutes=0, seconds=0):
        self.hours = hours
        self.minutes = minutes
        self.seconds = seconds
        self.total_seconds = 60*60*self.hours + 60*self.minutes + self.seconds
        
    def __str__(self):
        self.init_str = "{}:{}:{}".format(self.hours, self.minutes, self.seconds)
        return self.init_str
        
    def output(self, result):
        self.result_hours = self.result // 3600
        self.result_minutes = (self.result - self.result_hours*3600) // 60
        self.result_seconds = self.result - self.result_hours*3600 - self.result_minutes*60
        self.message = "{}:{}:{}".format(self.result_hours, self.result_minutes, self.result_seconds)
        return self.message
                
    def __add__(self, other):
        self.result = self.total_seconds + other.total_seconds
        return self.output(self.result)
                
    def __sub__(self, other):
        self.result = self.total_seconds - other.total_seconds
        return self.output(self.result)
    
    def __mul__(self, other):
        self.result = self.total_seconds * other
        return self.output(self.result)

fti = Interval(21,58,50)
sti = Interval(1,45,22)
try:
    if isinstance(fti, Interval) and isinstance(sti, Interval):
        print("First Time Interval:\t\t", fti)
        print("Second Time Interval:\t\t",sti)
        print("The result of (fit + sti):\t", fti + sti)
        print("The result of (fti - sti):\t", fti - sti)
        print("The result of (fti * 2):\t", fti * 2)
    else:
        raise TypeError
except:
    print("TypeError")