Function getattr_static

Lib/inspect.py:1750–1797

Retrieve attributes without triggering dynamic lookup via the descriptor protocol, __getattr__ or __getattribute__. Note: this function may not be able to retrieve all attributes that getattr can fetch (like dynamically created attributes) and may find attributes that g

(obj, attr, default=_sentinel)

def getattr_static(obj, attr, default=_sentinel):
    """Retrieve attributes without triggering dynamic lookup via the
       descriptor protocol,  __getattr__ or __getattribute__.

       Note: this function may not be able to retrieve all attributes
       that getattr can fetch (like dynamically created attributes)
       and may find attributes that getattr can't (like descriptors
       that raise AttributeError). It can also return descriptor objects
       instead of instance members in some cases. See the
       documentation for details.
    """
    instance_result = _sentinel

    objtype = type(obj)
    if type not in _static_getmro(objtype):
        klass = objtype
        dict_attr = _shadowed_dict(klass)
        if (dict_attr is _sentinel or
            type(dict_attr) is types.MemberDescriptorType):
            instance_result = _check_instance(obj, attr)
    else:
        klass = obj

    klass_result = _check_class(klass, attr)

    if instance_result is not _sentinel and klass_result is not _sentinel:
        if _check_class(type(klass_result), "__get__") is not _sentinel and (
            _check_class(type(klass_result), "__set__") is not _sentinel
            or _check_class(type(klass_result), "__delete__") is not _sentinel
        ):
            return klass_result

    if instance_result is not _sentinel:
        return instance_result
    if klass_result is not _sentinel:
        return klass_result

    if obj is klass:
        # for types we check the metaclass too
        for entry in _static_getmro(type(klass)):
            if (
                _shadowed_dict(type(entry)) is _sentinel
                and attr in entry.__dict__
            ):
                return entry.__dict__[attr]
    if default is not _sentinel:
        return default
    raise AttributeError(attr)


# ------------------------------------------------ generator introspection