add some function in a class instance dictionary within a decorator

class-decorator.py

# -*- encoding: utf-8 -*-
from functools import wraps


class C(object):
  def __init__(self):
    self.methods = {}

  def method(self, name):
    def decorator(fn):
      @wraps(fn)
      def wrapper(*args, **kwargs):
        self.methods[name] = fn
        return fn(*args, **kwargs)
      return wrapper
    return decorator


c = C()

@c.method('hello')
def my():
  print 'hello'

my()
print c.methods # prints {'hello': my}