class decorator to inherit documentation from abstract base class

gistfile1.py

from abc import ABCMeta, abstractmethod

def documented_by(documenting_abc):
  def document(cls):
    cls_dict = cls.__dict__.copy()
    for attr in documenting_abc.__abstractmethods__:
      cls_dict[attr].__doc__ = getattr(documenting_abc, attr).__doc__
    return type(cls.__name__, cls.__mro__[1:], cls_dict)
  return document


# Example
class StoreInterface(object):
  __metaclass__ = ABCMeta

  @abstractmethod
  def get(self, key):
    """Gets the value associated with :key."""

  @abstractmethod
  def set(self, key, value):
    """Associates :value with :key."""

@documented_by(StoreInterface)
class Store(StoreInterface):
  def __init__(self):
    self.__values = {}

  def get(self, key):
    return self.__values[key]

  def set(self, key, value):
    self.__values[key] = value

help(Store)