Defining class files

Simon Brunning SBrunning at trisystems.co.uk
Thu Mar 29 15:22:37 CEST 2001


> From:	Neil Benn [SMTP:neil.benn at cambridgeantibody.com]
> I'm wokring through the tutorial and have reached the section on classes
> in
> Python.  Working through the example on classes I have entered the class
> using the interpreter:-
> 
> class MyClass:
>     "A simple example class"
>     i = 12345
>     def f(x):
>         return 'hello world'
> 
>     This worked fine when I typed:-
> 
> >>> x=MyClass()
> >>> x.f()
> 'Hello World'
> 
>     However, I then tried to write the class as an external text file,
> using:-
> 
> class YourClass:
>     "A simple example class"
>     i = 12345
>     def f(x):
>         return 'hello world'
> 
>     I then imported the class, tried to assign the class and ivoke a
> method
> :-
> 
> >>> y = YourClass()
> Traceback (innermost last):
>   File "<console>", line 1,
> TypeError: call of non-func
> 
>     This seemed a bit strange, so I investigated the Your class and it
> seemed to be a module.
> 
> >>> YourClass
> <module YourClass at 2584541>
> 
>     The text file is saved as YourClass.py - is this the problem, should
> class files have different terminaters in their filename??
 
Assuming that you imported the module like this:

import YourClass

you need to qualify the class name, as so:

y = YourClass.YourClass()

the unqualified label YourClass refers to the imported module, not the class
within it.

HTH

Cheers,
Simon Brunning
TriSystems Ltd.
sbrunning at trisystems.co.uk




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