[Python] creating decorator out of another decorator (python)

After spending several hours on the topic of decorators in python, I still have two issues.

First; if you have decorator without argument, sytntax is like this:

@decorator
def bye():
return "bye"


which is just a syntactic sugar and is same as this

bye = decorator(bye)


but if I have a decorator with argument:

@decorator(*args)
def bye():
return "bye"


How does "no-sugar" version looks like? Is the function passed inside as one of the arguments?

bye = decorator("argument", bye)


Second issue(which is related to the first, yet more practical example);

def permission_required(permission):
def wrap(function):
@functools.wraps(function)
def wrapped_func(*args, **kwargs):
if not current_user.can(permission):
abort(403)
return function(*args, **kwargs)
return wrapped_function
return wrap

def admin_required(f):
return permission_required(Permission.ADMINISTER)(f)


Here permission_required decorator is passed to a return statement of newly created decorator named admin_required. I have no idea how this works. Mainly the return statement where we returning original decorator + the function(in strange syntax). Can someone elaborate on this? - details are extremely welcome

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