if a default value equal to ``None`` was set.

Now the annotation is returned unchanged.

..function::get_args(tp)

..function::get_origin(tp)

Provide basic introspection for generic types and special typing forms.

For a typing object of the form ``X[Y, Z, ...]`` these functions return

``X`` and ``(Y, Z, ...)``. If ``X`` is a generic alias for a builtin or

Get the unsubscripted version of a type: for a typing object of the form

``X[Y, Z, ...]`` return ``X``. If ``X`` is a generic alias for a builtin or

:mod:`collections` class, it gets normalized to the original class.

If ``X`` is an instance of:class:`ParamSpecArgs` or:class:`ParamSpecKwargs`,

return the underlying:class:`ParamSpec`.

Return ``None`` for unsupported objects.

Examples::

..versionadded::3.8

..function::get_args(tp)

Get type arguments with all substitutions performed: for a typing object

of the form ``X[Y, Z, ...]`` return ``(Y, Z, ...)``.

If ``X`` is a union or:class:`Literal` contained in another

generic type, the order of ``(Y, Z, ...)`` may be different from the order

of the original arguments ``[Y, Z, ...]`` due to type caching.

For unsupported objects return ``None`` and ``()``correspondingly.

Return ``()``for unsupported objects.

Examples::

..versionadded::3.8