On 1/14/11, Ben Ganzfried <ben.ganzfr...@gmail.com> wrote: > Hey guys, > > I'm using a tutorial geared for a 2.x version of Python and I am currently > using Python 3.1-- so it is possible that my confusion has to do with > different notations between them. But in any case, here is what I have: > >>>> type(Time) > <class 'type'> >>>> t1 = Time() >>>> type(t1) > <class '__main__.Time'> > > where: > > class Time: > def __init__(self, hours = 0, minutes = 0, seconds = 0): > self.hours = hours > self.minutes = minutes > self.seconds = seconds > > def print_time(t1): > print(t.hours, ":", t.minutes, ":", t.seconds) > > Now the book I am working with has the following example: > >>>> type(Point) > <type 'classobj'> >>>> p = Point() >>>> type(p) > <type 'instance'> > > My questions are the following: > 1) Why is the type for my class Time : >>> type(Time) > <class 'type'> > when the type for their class Point is: <type 'classobj'> > Also, what is the difference between "class" and "classobj" in this case? I am not sure as I thought something changed about this in 3.x, but try: class time(object) instead of simply class time and see what happens. > 2) Why does my t1 object give the following as its type: <class > '__main__.Time'> > And in their p object example the type is: <type 'instance'>? I am not sure, and am curious to see the answer as well. > 3) What is happening such that when I try to call my print_time(t1) function > I get the following error: >>>> t1 = Time() >>>> t1.hours = 3 >>>> t1.minutes = 30 >>>> t1.seconds = 45 >>>> print_time(t1) > Traceback (most recent call last): > File "<pyshell#77>", line 1, in <module> > print_time(t1) > NameError: name 'print_time' is not defined You made a time object. This means that everything about the object (class) is accessed through the dot notation. Currently, you are calling print_time(t1) where t1 is an object. You have to, as they say, call print_time on an instance of the time class. You have an instance, t1 (an instance is just a variable representing the class), so call print_time on the instance: t1.print_time() HTH. > > > Thank you very much. > > Sincerely, > > Ben >
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