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W. Trevor King authored
ArgumentParser lost its undocumented version argument in 3.3.0 [1,2,3]. The version action is the documented way to do this [4]. [1]: http://bugs.python.org/issue13248 [2]: https://hg.python.org/cpython/rev/5393382c1b1d [3]: https://hg.python.org/cpython/file/374f501f4567/Misc/HISTORY#l477 [4]: https://docs.python.org/3/library/argparse.html#action
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