making a variable available in a function from decorator

[Bruno Desthuilliers]

Evan Klitzke a écrit :

Sort of. Functions are objects in python, so you can set attribute on them. E.g.

def foo():
return foo.c

foo.c = 1
print foo()

.... print foo.c
....Traceback (most recent call last):
File "<stdin>", line 1, in ?

Which will print 1. Of course, it would generally be better to write
your own class for this sort of thing, so that you can set the
variable in the instance scope.

Indeed. But even with OO, explicit is better than implicit.

 

[rkmr.em]

Hi
I create a variable in a decorator. i want to be able to access that
variable in the function to be decorated. How to do this?
thanks

 

[Marc 'BlackJack' Rintsch]

I create a variable in a decorator. i want to be able to access that
variable in the function to be decorated. How to do this?

Pass it as argument to the function:

def deco(func):
eggs = 42
def decorated(*args, **kwargs):
kwargs['spam'] = eggs
func(*args, **kwargs)
return decorated

@deco
def test(parrot, spam):
print parrot, spam

Ciao,
Marc 'BlackJack' Rintsch

 

[rkmr.em]

is it possible to do this without passing it as a function argument?

I create a variable in a decorator. i want to be able to access that
variable in the function to be decorated. How to do this?

Pass it as argument to the function:

def deco(func):
eggs = 42
def decorated(*args, **kwargs):
kwargs['spam'] = eggs
func(*args, **kwargs)
return decorated

@deco
def test(parrot, spam):
print parrot, spam

Ciao,
Marc 'BlackJack' Rintsch

 

[Bruno Desthuilliers]

(e-mail address removed) a écrit :
(top-post corrected)

>

Pass it as argument to the function:

def deco(func):
eggs = 42
def decorated(*args, **kwargs):
kwargs['spam'] = eggs
func(*args, **kwargs)
return decorated

@deco
def test(parrot, spam):
print parrot, spam

> is it possible to do this without passing it as a function argument?

What's your use case, exactly ? Having a function depending on a name
being set by a decorator is not exactly pythonic, and arguments are
meant to pass variables to functions...

 

[Evan Klitzke]

is it possible to do this without passing it as a function argument?

Sort of. Functions are objects in python, so you can set attribute on them. E.g.

def foo():
return foo.c

foo.c = 1
print foo()

Which will print 1. Of course, it would generally be better to write
your own class for this sort of thing, so that you can set the
variable in the instance scope.