Help understanding code

[Bruno Desthuilliers]

elbertlev at hotmail.com a écrit :
> Reading the language tututorial would help you a lot :(
> 
> === what is the difference between pc and pc()?
> 
> pc = getToolByName(....)  - returnes a refference to a method

Nope.

> pc is a refference to a method, 
> 
Nope.

pc is not 'a reference to a method', it's a callable object (in this 
case a ZCatalog instance...)....

 > pc() is a method invocation.

In this case, it happens to be a call to a method of ZCatalog, but it 
could have been a call to a named or anonymous function as well...

<op>
In Python, functions and methods are objects too, so you can use them 
like any other object :

def fun():
   print "hello world"

machin = fun
machin()
 >> hello world

But objects can be used like functions too, if they define a __call__ 
method:

class fakeFun(object):
   def __init__(self, name):
     self.name = name
   def __call__(self):
      return "hello, I'm %s" % self.name

f= fakeFun('foo')
f()
 >> hello, I'm foo
</op>

HTH
Bruno