Conditional arguments

[mottosso]

Let some arguments depend on other arguments.

parser.add_argument("colored", default=False)
parser.add_argument("color", condition=lambda: parser["colored"] == True)

For example, disable or hide color if colored is False.

Syntax is still unclear, could also be:

parser.add_argument("color", dependencies=["colored"])

Whereby any "dependency" is tested with return bool(arg), such that each argument can override __nonzero__ and __bool__ to control the behavior.

Also needs some indication of what to do if the condition is False.

parser.add_argument("color", condition=, condition_behavior=Hide)
# Or "Disable" or "Ignore"