[issue9293] Unsupported IO operations should raise UnsupportedOperation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Another kind of unsupported operation is non-absolute seeking on a TextIOWrapper:

>>> open("LICENSE").seek(1, 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: can't do nonzero cur-relative seeks

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9293>
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