Question

I built a new class in python which defines time with 6 figures (such as 18:45:00)

class Time(object):

    def __init__(self, hour, minute, second):
        minute = minute + second / 60
        hour = hour + minute / 60        
        self.hour = hour % 24
        self.minute = minute % 60
        self.second = second  % 60

I have also defined many methods to make it work as it should.
the problem I have is with the cmp method:

def __cmp__(self,other):
    return cmp(self.to_seconds(),other.to_seconds())

It works fine when I try to compare times, if I’m sorting a list of times it also works fine. But if I’m trying to sort a list of times and integers or strings it also work.
How can I define it to compare only times and to raise and error if trying to compare time with something that isn’t.

Answer 1

You can use isinstance() to see if the argument is an instance of some class. See documentation.