Terry J. Reedy <tjre...@udel.edu> added the comment:

I don't understand the -h (display help part) but pasting code into repository 
3.8 IDLE editor and running, I get same traceback.

Never having used argparse, I don't know if a multiline metavar is expected to 
work.  Assuming so, can you suggest a fix?

nosy: +bethard, terry.reedy
stage:  -> test needed
versions: +Python 3.7, Python 3.8

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