def __is_bound_method ( method ) : if not ( hasattr ( method , "__func__" ) and hasattr ( method , "__self__" ) ) : return False # Bound methods have a __self__ attribute pointing to the owner instance return six . get_method_self ( method ) is not None
python 3 bound unbound method
Return True if the method is a bound method ( attached to an class instance .
def __is_bound_method(method):
    """Return ``True`` if the `method` is a bound method (attached to an class
    instance.

    Args:
        method: A method or function type object.
    """
    if not(hasattr(method, "__func__") and hasattr(method, "__self__")):
        return False

    # Bound methods have a __self__ attribute pointing to the owner instance
    return six.get_method_self(method) is not None