OOP with MyTime

MRAB python at mrabarnett.plus.com
Wed Jul 2 22:02:00 CEST 2014


On 2014-07-02 20:20, kjakupak at gmail.com wrote:
> I'm trying to write a boolean function that takes two Mytime objects, t1 and t2 as arguments, and returns True if the object falls inbetween the two times.
>
> This is a question from the How to Think Like a Computer Scientist book, and I need help.
>
> What I've gotten so far:
>
> class MyTime:
>      def __init__(self, hrs=0, mins=0, secs=0):
>          self.hours = hrs
>          self.minutes = mins
>          self.seconds = secs
>      def between(t1, t2):
>          if float(t1 <= t3) and float(t3 < t2):
>              return True
>          else:
>              return False
>
> I just don't understand how to make a function that uses MyTime objects into the boolean function? Any help would be great.
>
If you want 'between' to be an instance method of the MyTime class, it
needs 'self' as well as the 2 arguments 't1' and 't2'.

You can then compare the hours, minutes and seconds of self against
those of t1 and t2:

     def between(self, t1, t2):
         return (t1.hours, t1.minutes, t1.seconds) <= (self.hours, 
self.minutes, self.seconds) and (self.hours, self.minutes, self.seconds) 
<= (t2.hours, t2.minutes, t2.seconds)

That could be shortened further using chained comparisons.

Note that the code assumes that the times t1 and t2 are ordered, i.e.
that time t1 is not later/greater than time t2.



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