Here's a slightly more interesting example: record the fact that
"-a"
is seen, but blow up if it comes after "-b"
in the
command-line.
def check_order(option, opt_str, value, parser): if parser.values.b: raise OptionValueError("can't use -a after -b") parser.values.a = 1 [...] parser.add_option("-a", action="callback", callback=check_order) parser.add_option("-b", action="store_true", dest="b")
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