how to convert all warnings to errors?

[Skip Montanaro]

    >> I thought there was a simple command line flag to turn warnings into
    >> errors, but I can't seem to find it.  Pointers?

    Alex> python -W error

Thanks.  I couldn't figure out from "python -h" what was expected and didn't
know where, if anywhere, the docs discuss the interpreter's command line
args.

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