Antoine Pitrou <pit...@free.fr> added the comment:

The expected behaviour here would be to raise ValueError, as on other closed 
objects:

>>> s = io.StringIO()
>>> s.close()
>>> s.write("")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: I/O operation on closed file

----------
nosy: +pitrou
versions: +Python 3.8 -Python 3.6

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<https://bugs.python.org/issue22872>
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