[Tutor] Object/Class Beginner Questions

[Ben Ganzfried]

I actually just figured it out (since the tutorial talks about the
difference in indentation between a method and a function in a later
chapter).  Basically, a method is within a class and therefore cannot be
called from the command prompt whereas a function that stands by itself in a
script can be called from the command prompt.

Although if this isn't quite right or there's more to it, I would still
definitely appreciate any advice you have.

Thanks again,

Ben

On Fri, Jan 14, 2011 at 1:53 PM, Ben Ganzfried <ben.ganzfried at 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?
> 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'>?
> 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
>
>
> Thank you very much.
>
> Sincerely,
>
> Ben
>
>
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