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| 55 | <H2><A NAME="SECTION0082140000000000000000"></A><A NAME="optparse-option-callbacks"></A> | |
| 56 | <BR> | |
| 57 | 6.21.4 Option Callbacks | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | When <tt class="module">optparse</tt>'s built-in actions and types aren't quite enough for your | |
| 62 | needs, you have two choices: extend <tt class="module">optparse</tt> or define a callback option. | |
| 63 | Extending <tt class="module">optparse</tt> is more general, but overkill for a lot of simple | |
| 64 | cases. Quite often a simple callback is all you need. | |
| 65 | ||
| 66 | <P> | |
| 67 | There are two steps to defining a callback option: | |
| 68 | ||
| 69 | <UL> | |
| 70 | <LI> | |
| 71 | define the option itself using the <code>callback</code> action | |
| 72 | ||
| 73 | <P> | |
| 74 | </LI> | |
| 75 | <LI> | |
| 76 | write the callback; this is a function (or method) that | |
| 77 | takes at least four arguments, as described below | |
| 78 | ||
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| 91 | <LI><A href="optparse-defining-callback-option.html">6.21.4.1 Defining a callback option</a> | |
| 92 | <LI><A href="optparse-how-callbacks-called.html">6.21.4.2 How callbacks are called</a> | |
| 93 | <LI><A href="optparse-raising-errors-in-callback.html">6.21.4.3 Raising errors in a callback</a> | |
| 94 | <LI><A href="optparse-callback-example-1.html">6.21.4.4 Callback example 1: trivial callback</a> | |
| 95 | <LI><A href="optparse-callback-example-2.html">6.21.4.5 Callback example 2: check option order</a> | |
| 96 | <LI><A href="optparse-callback-example-3.html">6.21.4.6 Callback example 3: check option order (generalized)</a> | |
| 97 | <LI><A href="optparse-callback-example-4.html">6.21.4.7 Callback example 4: check arbitrary condition</a> | |
| 98 | <LI><A href="optparse-callback-example-5.html">6.21.4.8 Callback example 5: fixed arguments</a> | |
| 99 | <LI><A href="optparse-callback-example-6.html">6.21.4.9 Callback example 6: variable arguments</a> | |
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