Juan Jimenez-Anca added the comment:
My apologies for the formatting of the last line. This is my issue corrected:
When trying to assign the metavar in add_argument() method of argparse module
I'm unable to include characters after a right square bracket.
Trying to set something like this:
metavar="[host:database:collection:]field"
would raise an AssertionError, which includes:
File "/usr/lib64/python3.4/argparse.py", line 329, in _format_usage
assert ' '.join(opt_parts) == opt_usage
However, the following is accepted:
metavar="[host:database:collection:] field"
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<http://bugs.python.org/issue25058>
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