Hi Gerald,
When you define an instance method, the first parameter (in the definition) represents the instance. By convention, you would name it "self":
#####################
class B:
def foo(self, x):
print "we have two parameters: " + str(self) + " and " + x
#####################then calling
######################
b = B()
b.foo("x")
######################would be equivalent to
###################### b = B() B.foo(b, "x") ######################
So, as you have noted, you need at least one parameter to attach the method to an instance. This is because the instance _is_ the parameter. Python does this for you internally.
For more documentation you should read the paragraph about classes in the tutorial.
Regards, Matthias -- http://mail.python.org/mailman/listinfo/python-list
