Alexander Draeger <[EMAIL PROTECTED]> wrote:
> Hello everybody,
>
> I'm very interesting in using the decorator concept, but I can't
> convert it in useful things. I have read many about decorators and
> have seen a lot of examples, but I search a possibility, to decorate
> methods of classes with reference to the instances. For example:
>
> I have a class A:
>
> class A(object):
> def __init__(self, name):
> self.name=name
>
> @logging
> def hello(self, name):
> print 'Hello World.'
>
>
>
> >>>a=A('Ernie')
> >>>b=A('Bert')
> >>>a.hello()
> Entering a method. [Ernie]
> Hello World.
>
> >>>b.hello()
> Entering a method. [Bert]
> Hello World.
>
>
> How should I implement the function logging, when I want to use the
> variable self.name for the logging message?
>
(Did you intend that other parameter to the hello method? If so you had
better pass it in when you call the method.)
Try this:
>>> def logging(f):
def deco(self, *args, **kw):
print "Entering a method [%s]" % self.name
return f(self, *args, **kw)
return deco
>>> class A(object):
def __init__(self, name):
self.name=name
@logging
def hello(self, name):
print 'Hello World.'
>>> a=A('Ernie')
>>> a.hello('world')
Entering a method [Ernie]
Hello World.
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