Require either of two arguments using argparse

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Track title: Puzzle Meditation

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Chapters
00:00 Question
00:41 Accepted answer (Score 420)
01:11 Answer 2 (Score 47)
01:29 Thank you

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Full question
https://stackoverflow.com/questions/1115...

Accepted answer links:
[mutual exclusion]: http://docs.python.org/library/argparse....
[another question]: https://stackoverflow.com/questions/5603...

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Tags
#python #argparse

#avk47