paul j3 added the comment:
Just hang on the Action object that the `add_argument` returned, and change its
`help` attribute.
a = parser.add_argument('--foo', help='initial help')
....
a.help = 'new help'
If using a custom parser class and subclass, I'd do something like:
self.changeablearg = self.parser.add_argument...
in the class, and
self.changeablearg.help = 'new help'
in the subclass
You can test the help message with
print parser.format_help()
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