Function ismethoddescriptor

Lib/inspect.py:196–217

Return true if the object is a method descriptor. But not if ismethod() or isclass() or isfunction() are true. This is new in Python 2.2, and, for example, is true of int.__add__. An object passing this test has a __get__ attribute, but not a __set__ attribute or a __delete__ attri

(object)

    return ismodule(object) and hasattr(object, "__path__")

def ismethoddescriptor(object):
    """Return true if the object is a method descriptor.

    But not if ismethod() or isclass() or isfunction() are true.

    This is new in Python 2.2, and, for example, is true of int.__add__.
    An object passing this test has a __get__ attribute, but not a
    __set__ attribute or a __delete__ attribute. Beyond that, the set
    of attributes varies; __name__ is usually sensible, and __doc__
    often is.

    Methods implemented via descriptors that also pass one of the other
    tests return false from the ismethoddescriptor() test, simply because
    the other tests promise more -- you can, e.g., count on having the
    __func__ attribute (etc) when an object passes ismethod()."""
    if isclass(object) or ismethod(object) or isfunction(object):
        # mutual exclusion
        return False
    tp = type(object)
    return (hasattr(tp, "__get__")
            and not hasattr(tp, "__set__")
            and not hasattr(tp, "__delete__"))

def isdatadescriptor(object):
    """Return true if the object is a data descriptor.