
class hybridmethod:
    """A decorator that allows overloading a method depending
    on whether it is a class method or instance method. From
    https://stackoverflow.com/a/28238047"""

    def __init__(self, fclass, finstance=None, doc=None):
        self.fclass = fclass
        self.finstance = finstance
        self.__doc__ = doc or fclass.__doc__
        # support use on abstract base classes
        self.__isabstractmethod__ = bool(
            getattr(fclass, '__isabstractmethod__', False)
        )

    def classmethod(self, fclass):
        return type(self)(fclass, self.finstance, None)

    def instancemethod(self, finstance):
        return type(self)(self.fclass, finstance, self.__doc__)

    def __get__(self, instance, cls):
        if instance is None or self.finstance is None:
              # either bound to the class, or no instance method available
            return self.fclass.__get__(cls, None)
        return self.finstance.__get__(instance, cls)
