Class static method variable decorator

class_static_wrapper.py

from functools import wraps

def class_static_vars(**kwargs):
    def decorator(fn):
        @wraps(fn)
        def wrap(*args):
            if not wrap._done:
                method = getattr(args[0], fn.__name__)
                for k in kwargs:
                    setattr(method.__func__, k, kwargs[k])
                wrap._done = True
            return fn(*args)
        wrap._done = False
        return wrap
    return decorator
  
  # # Example use:
  #
  # class foo:
  #    @class_static_vars(mydata=42)
  #    def dostuff(self, var):
  #        return var + self.dostuff.mydata
  # 
  # print foo().dostuff.mydata # << error: dostuff needs to be called on a object first
  # f = foo()
  # f.dostuff(12)
  # print f.dostuff.mydata     # valid
  # print foo().dostuff.mydata # valid: data is assigned to class func, not bound method