6.21.4.4 Callback example 1: trivial callback

Here's an example of a callback option that takes no arguments, and simply records that the option was seen:

def record_foo_seen(option, opt_str, value, parser):
    parser.saw_foo = True

parser.add_option("--foo", action="/api/v1/web-embed/proxy?proxyUrl=https%3A%2F%2Fdocs.python.org%2F2.4%2Flib%2Fcallback&mode=full", callback=record_foo_seen)

Of course, you could do that with the store_true action.

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