[Tutor] Object/Class Beginner Questions

[Ben Ganzfried]

* I meant that*: A method actually can be called from the command prompt,
but the syntax is quite different than that used to call a function from the
command prompt.

On Fri, Jan 14, 2011 at 2:37 PM, Ben Ganzfried <ben.ganzfried at gmail.com>wrote:

> 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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