095ff238d0
It's much nicer for the user if we fail early instead of doing partial processing if we cannot read some input. We can't do those checks immediately from argparse.Parser.parse_args(), because we want to fully process the commandline first. In particular, even with invalid args, if --help is specified somewhere, we want to handle that. Thus, we need to delay the checks after argparse.Parser.parse_args() returns. Ukify didn't have type annotations on functions, but it probably should. Jörg's suggested correction included them and we might just as well start here.
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