Question

I found really good example how to add new method to the class dynamically (transplant class):

def say(host, msg):
   print '%s says %s' % (host.name, msg)

def funcToMethod(func, clas, method_name=None):
   setattr(clas, method_name or func.__name__, func)

class transplant:
   def __init__(self, method, host, method_name=None):
      self.host = host
      self.method = method
      setattr(host, method_name or method.__name__, self)

   def __call__(self, *args, **kwargs):
      nargs = [self.host]
      nargs.extend(args)
      return apply(self.method, nargs, kwargs)

class Patient:
   def __init__(self, name):
      self.name = name

if __name__ == '__main__':
   jimmy = Patient('Jimmy')
   transplant(say, jimmy, 'say1')
   funcToMethod(say, jimmy, 'say2')

   jimmy.say1('Hello')
   jimmy.say2(jimmy, 'Good Bye!')

But I don’t understand, how to modify it for adding static methods. Can someone help me?

Answer 1

All you need to do is wrap the function in a staticmethod() call:

say = staticmethod(say)

or apply it as a decorator to the function definition:

@staticmethod
def say(host, msg):
    # ...

which comes down to the same thing.

Just remember; the @decorator syntax is just syntactic sugar for writing target = decorator(target), where target is the decorated object.