Simple questions about classes

[Grant Edwards]

In article <bbb4a9e1.0302111148.48dc074b at posting.google.com>, Natan wrote:

> I think self points to the class,

No, self points to an instance of the class.

> but why do we need to pass this parameter to every function?

While you have to declare it, you don't have to pass it when
you're calling a bound method. You only have to pass it when
calling an unbound method:

class A:
    def foo(self,arg):
        print "foo:",`self`,arg
    def bar(self,arg):
        print "bar:",`self`,arg
        
a1 = A()
a2 = A()

a1.foo("asdf")
A.foo(a1,"asdf")

a2.foo("qwer")
A.foo(a2,"qwer")
   
a1.bar(3.14159)
A.bar(a1,42)



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