Get access to kwargs and args at the wrapper of decorator

Question

I have a class based decorator. The problem is that I need to be able to have access to wraped function args and kwargs but now I can't and I don't understand why. It should be easy but it's not for me.

class limit:
    def __call__(self, fn):
        @wraps(fn)
        # the idea to use signature like (request, *args, **kwargs) is bad. I must accept *args and **kwargs only 
        def wrapper(*args, **kwargs):
             # pdb breakpoint is here
             user = kwargs.get('user') or kwargs.get('request').user // ERROR

             return fn(*args, **kwargs)

        return wrapper

Let's have a look at pdb. That's ****CENSORED**** crazy.

(Pdb) args
args = (<User: dua>,)
kwargs = {}
(Pdb) kwargs
{}
(Pdb) args.args
args = (<User: dua>,)
kwargs = {}
(Pdb) args.args.args.args
args = (<User: dua>,)
kwargs = {}
(Pdb) args.get('user')
args = (<User: dua>,)
kwargs = {}
(Pdb) type(args)
<class 'tuple'>
(Pdb) 

The question is how can I get access to args, kwargs and treat args as list and kwargs as dict.

PS I don't know why it args and kwargs looks like that. Why they do look like that?

---

As mentioned at the answer args is command of pdb. User repr(args) to see args.

Next question is possible signatures of function: 1) def fn(request, ...) 2) def fn(self, a, b, c, etc, user) 3) def fn(user)

Are there a way to deal with all of them with one decorator?

---

Answer 1

Your pdb output is not really relevant, args here acts like interactive pdb command.

For the sake of simplicity, either use repr(args) or temporary rename *args argument

Answer 2

I ended up with this solution:

def wrapper(*args, **kwargs):
    user = None
    fn_signature_args = inspect.getfullargspec(fn).args
    # looking for a user in kwargs
    if 'user' in kwargs:
    user = kwargs['user']
    # looking for a user as positional argument
    elif 'user' in fn_signature_args:
    index = fn_signature_args.index('user')
    user = args[index]
    # looking for a user as self or request attribute
    elif fn_signature_args[0] in ('request', 'self'):
    user = args[0].user