George Boutsioukis <gboutsiou...@gmail.com> added the comment: Flushing stdout is still necessary, though not enough. The processes will still have to use some kind of synchronization, and the performance toll of adding a lock to synchronize output is negligible, given that printing to stdout takes a tiny amount of time compared to the rest of the 2to3 code. This patch seems to fix the issue without affecting performance.
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