difference between class methods and instance methods

[Duncan Booth]

John wrote:
>> Note that it doesn't matter whether you call instance.foo(2)
>> directly, or bind instance.foo to a variable first. Either will
>> create a *new* bound method object, and the correct instance is used
>> for the call. 
> 
> Za! What do you mean, "create a new bound method object"? I *already*
> created that method when I def'd it inside the 'class Demo' statement,
> no?
> 
The def statement creates a function.
Accessing the method through the class creates a brand new unbound method 
from the function. Every access of the method through the class creates a 
separate unbound method.

Accessing the method through the instance creates a brand new bound method. 
Every such access creates a separate bound method.

> 
> ... hmm... bound methods get created each time you make
> a call to an instance method via an instance of the given class?
> 
you've got it.