paul j3 added the comment:
Here's a type function that enumerates the enum in the error message:
def enumtype(astring):
try:
return CustomEnumType[astring.upper()]
except KeyError:
msg = ', '.join([t.name.lower() for t in CustomEnumType])
msg = 'CustomEnumType: use one of {%s}'%msg
raise argparse.ArgumentTypeError(msg)
You could do the same sort of enumeration in the `help` parameter (or even the
metavar).
One further note - the input string is first passed through `type`, then it is
checked against the `choices` (if any). If it is converted to the enum in an
type function, the choices will also have to be enums, not their string
representation.
String defaults are (usually) passed through `type`. Nonstring defaults are
not converted or tested.
So the value of this sort of type function depends on whether it is more
convenient to work with the string representation or the enum itself. When
exactly do you want the commandline string to be converted to the enum?
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25061>
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