Get class in Python decorator

Question

In this code:

def online_only(func, self):
    def f(*args, **kwargs):
        if self.running:
            return func(*args, **kwargs)
        else:
               


        

Answer 1

1. You can not have two arguments in def online_only(func, self) ? it will raise TypeError, so change it to def online_only(func)
2. The first argument to wrapped function would be self, you can just use that e.g.

---

def online_only(func):
    def f(self):
        if self.running:
            return func(self)
        else:
            return False
    return f

class VM(object):
    @property
    def running(self):
        return True

    @property
    @online_only
    def diskinfo(self):
        return True

print VM().diskinfo

Answer 2

self is passed as the first parameter to the wrapping function, so just treat the first parameter specially in f:

def online_only(func):
    def f(self, *args, **kwargs):
        if self.running:
            return func(self, *args, **kwargs)
        else:
            return False
    return f