comprehensions.py

def verbal(some_class):
    """intended as a class decorator allowing to list all attributes and where
    they come from"""

    def tell(inst):
        print(
            "{:>16}: {}\n"
            .format("instance",
                    ", ".join(a
                              for a in vars(inst)
                              if not a.startswith("__")
                              )
                    )
            +
            "".join(["{:>16}: {}\n"
                     .format(cls.__name__,
                             ", ".join(
                                 sorted([a
                                         for a in vars(cls)
                                         if not a.startswith("__")]
                                        )
                             )
                             )
                     for cls in type(inst).__mro__]
                    )
            +
            "{:>16}: {}\n".format(type(type(inst)).__name__,
                                  ", ".join(a
                                            for a in vars(type(type(inst)))
                                            if not a.startswith("__")
                                            )
                                  )
            )

    some_class.tell = tell
    return some_class