[Tutor] Strange class behavior

Simon Brunning SBrunning@trisystems.co.uk
Thu, 30 Nov 2000 16:38:47 -0000

> From:	Darrell Brogdon [SMTP:dbrogdon@valinux.com]
> Why is it that when I run the following script:
> class myTestClass:
>     def myTestMethod(self):
>         print "Test, Test, 1-2-3"
> b = myTestClass
> b.myTestMethod()
> I get the following error:
> Traceback (most recent call last):
>   File "./test2.py", line 9, in ?
>     b.myTestMethod()
> TypeError: unbound method must be called with class instance 1st
> argument
> Clearly I'm doing something wrong with the method definition but I've
> not been able to determine what?
Your method definition is fine. The problem is with the line where you
instantiate your object, or rather, don't. You need this:

b= myTestClass()

rather than:

b= myTestClass

The latter creates new reference to the myTestClass class, rather than
creating on object belonging to that class.

Simon Brunning
TriSystems Ltd.

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