Class decorator for inheriting docstrings.

    Automatically inherits base class doc-strings if not present in the
    derived class.

def inherit_docstrings(cls):
    """Class decorator for inheriting docstrings.

    Automatically inherits base class doc-strings if not present in the
    derived class.

    """
    @functools.wraps(cls)
    def _inherit_docstrings(cls):
        if not isinstance(cls, (type, colorise.compat.ClassType)):
            raise RuntimeError("Type is not a class")

        for name, value in colorise.compat.iteritems(vars(cls)):
            if isinstance(getattr(cls, name), types.MethodType):
                if not getattr(value, '__doc__', None):
                    for base in cls.__bases__:
                        basemethod = getattr(base, name, None)

                        if basemethod and getattr(base, '__doc__', None):
                            value.__doc__ = basemethod.__doc__

        return cls

    return _inherit_docstrings(cls)