[issue4604] close() seems to have limited effect

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

Amaury> - It should use
    Amaury>    self._checkClosed()
    Amaury> which already raises the same exception with the same message.

I think some other places will need this change then.

Note that I don't know the io code at all.  I was just trying to provide a
simple test case and a simple fix.  Feel free to generalize it as necessary.

Skip

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