Prepend a level to a pandas MultiIndex

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Chapters
00:00 Question
00:41 Accepted answer (Score 240)
01:06 Answer 2 (Score 166)
01:39 Answer 3 (Score 50)
02:21 Answer 4 (Score 6)
04:15 Thank you

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Full question
https://stackoverflow.com/questions/1474...

Accepted answer links:
[docs]: http://pandas.pydata.org/pandas-docs/sta...

Answer 4 links:
[cxrodgers answer]: https://stackoverflow.com/a/56278736/249...

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Tags
#python #pandas

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