Terry J. Reedy <tjre...@udel.edu> added the comment:
The io doc says for IOBase flush()
Flush the write buffers of the stream if applicable. This does nothing for
read-only and non-blocking streams.
and for BufferedWriter flush()
Force bytes held in the buffer into the raw stream. A BlockingIOError
should be raised if the raw stream blocks.
On 3.x, open(filename, "wb"), used in writefile(), returns a BufferedWriter.
So it seems than an exception is possible, which would crash IDLE without
try-except.
Serhiy, please read the previous message(s). Do you remember if you intended
to remove the f.flush in writefile(), which Guido proposes to restore?
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nosy: +serhiy.storchaka
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<https://bugs.python.org/issue36807>
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