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``` - add language identifier to highlight code ```python
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lang-py
metavar='cmd'toadd_subparsers. Without metavar:usage: jobs.py [-h] {run,list,show}. With metavar:usage: jobs.py [-h] cmd. As the error message when no cmd is provided is "error: the following arguments are required: cmd", I prefer to havecmdexplicitly displayed in usage. The available choices forcmdare displayed in the full help anyway.