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| 55 | <H3><A NAME="SECTION0082143000000000000000"></A><A NAME="optparse-raising-errors-in-callback"></A> | |
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| 57 | 6.21.4.3 Raising errors in a callback | |
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| 61 | The callback function should raise OptionValueError if there are any | |
| 62 | problems with the option or its argument(s). <tt class="module">optparse</tt> catches this and | |
| 63 | terminates the program, printing the error message you supply to | |
| 64 | stderr. Your message should be clear, concise, accurate, and mention | |
| 65 | the option at fault. Otherwise, the user will have a hard time | |
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