Sort of. Functions in Python are just objects. They can be passed
around, assigned to variables, and even have attributes added to them. A
decorator is a way to take a newly created function and do something to
it, such as create a new function that calls it. The most common use of
decorators is in creating static and class methods. Old way:
class C(object):
def method(x):
# A static method. It is just a function, no 'self'
print x
method = staticmethod(method)
New way:
class C(object):
@staticmethod
def method(x):
print x
In both cases staticmethod is the same python type that takes a function
as an argument and creates a static method instance which is then
assigned the name "method". But all this is outside of the scope of this
mailing list. All you could ever want to know about decorators is here:
http://www.python.org/dev/peps/pep-0318/
Lenard
Yanom Mobis wrote:
Ohhhh! I get it now! It's used to insure that a specific function is always
called before another. Thanks for clearing it up for me.
--- On Wed, 12/31/08, Michael Phipps <michael.phi...@bluetie.com> wrote:
From: Michael Phipps <michael.phi...@bluetie.com>
Subject: Re: [pygame] @
To: pygame-users@seul.org
Date: Wednesday, December 31, 2008, 4:37 PM
Yanom -
A decorator is a method that takes another method as a parameter so that it can
do something. It is usually used for aspect oriented programming.
For example:
def logThisMethodCall(methodCall)
# Do some logging here
@logThisMethodCall
def myMethod(a,b,c)
# do Somthing in here
Now, whenever you call "myMethod", logThisMethodCall gets called first, with
the invocation of myMethod passed into it. You can use it for logging, security (i.e.
does this person have permission to be calling this), etc.
Michael
-----Original Message-----
From: "Yanom Mobis" [ya...@rocketmail.com]
Date: 12/31/2008 11:19
To: pygame-users@seul.org
Subject: Re: [pygame] @
so when you do this:
@foo
def bar(): pass
you assume that a function foo() already exists.
and it creates something like this:
def foo():
def bar(): pass
pass
?
I'm sorry, I just got confused.
- On Wed, 12/31/08, Noah Kantrowitz <n...@coderanger.net> wrote:
From: Noah Kantrowitz <n...@coderanger.net>
Subject: Re: [pygame] @
To: pygame-users@seul.org
Date: Wednesday, December 31, 2008, 3:01 AM
decorator. The short version is that this
@foo
def bar(): pass
is the same as this
def bar(): pass
bar = foo(bar)
The long version is "look it up because it gets very complicated and
voodoo-ish"
--Noah
On Dec 30, 2008, at 9:55 PM, Yanom Mobis wrote:
I was reading some Python code examples, and i found the @ symbol. What
exactly does this operator do?
--
Lenard Lindstrom
<le...@telus.net>
