without needing to explicitly close ``page``. Even if an error occurs,

``page.close()`` will be called when the:keyword:`with` block is exited.

..note::

Most types managing resources support the:term:`context manager` protocol,

which closes *thing* on leaving the:keyword:`with` statment.

As such,:func:`!closing` is most useful for third party types that don't

support context managers.

This example is purely for illustration purposes,

as:func:`~urllib.request.urlopen` would normally be used in a context manager.

..function::aclosing(thing)