Example usage::

    with ctx.scope():
        assert get_current_context() is ctx

This is equivalent::

    with ctx:
        assert get_current_context() is ctx

.. versionadded:: 5.0

:param cleanup: controls if the cleanup functions should be run or
                not.  The default is to run these functions.  In
                some situations the context only wants to be
                temporarily pushed in which case this can be disabled.
                Nested pushes automatically defer the cleanup.
r