How to use a function variable from **kwargs in python?

Question

I am trying to do the following, but am getting an exception NameError("global name 'rid' is not defined",

def safe_forcecall(fn):
    def _safe_forcecall(self, *args, **kwargs):
        if self._token_valid(rid) is not None:
            return fn(self, *args, **kwargs)
    return _safe_forcecall


@safe_forcecall
def add_booking(self, rid, data):
    ...

Answer 1

You are passing in rid as a positional argument, so can be found in args instead:

if self._token_valid(args[0]) is not None:

If your decorator always needs access to that argument, just name it explicitly:

def safe_forcecall(fn):
    def _safe_forcecall(self, rid, *args, **kwargs):
        if self._token_valid(rid) is not None:
            return fn(self, rid, *args, **kwargs)
    return _safe_forcecall

You won't find the value in the kwargs dictionary; only if you were to call add_booking with a rid=rid argument would it be placed there. By using an explicit rid argument in your decorator wrapper function, you make sure it is always bound to the rid name.