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| 53 | ||
| 54 | <H3><A NAME="SECTION00821310000000000000000"></A><A NAME="optparse-other-methods"></A> | |
| 55 | <BR> | |
| 56 | 6.21.3.10 Other methods | |
| 57 | </H3> | |
| 58 | ||
| 59 | <P> | |
| 60 | OptionParser supports several other public methods: | |
| 61 | ||
| 62 | <UL> | |
| 63 | <LI> | |
| 64 | <code>set_usage(usage)</code> | |
| 65 | ||
| 66 | <P> | |
| 67 | Set the usage string according to the rules described above for the | |
| 68 | <code>usage</code> constructor keyword argument. Passing <code>None</code> sets the | |
| 69 | default usage string; use <code>SUPPRESS_USAGE</code> to suppress a usage | |
| 70 | message. | |
| 71 | ||
| 72 | <P> | |
| 73 | </LI> | |
| 74 | <LI> | |
| 75 | <code>enable_interspersed_args()</code>, <code>disable_interspersed_args()</code> | |
| 76 | ||
| 77 | <P> | |
| 78 | Enable/disable positional arguments interspersed with options, similar | |
| 79 | to GNU getopt (enabled by default). For example, if <code>"-a"</code> and | |
| 80 | <code>"-b"</code> are both simple options that take no arguments, <tt class="module">optparse</tt> | |
| 81 | normally accepts this syntax: | |
| 82 | <div class="verbatim"><pre> | |
| 83 | prog -a arg1 -b arg2 | |
| 84 | </pre></div> | |
| 85 | ||
| 86 | <P> | |
| 87 | and treats it as equivalent to | |
| 88 | <div class="verbatim"><pre> | |
| 89 | prog -a -b arg1 arg2 | |
| 90 | </pre></div> | |
| 91 | ||
| 92 | <P> | |
| 93 | To disable this feature, call <code>disable_interspersed_args()</code>. This | |
| 94 | restores traditional <span class="Unix">Unix</span> syntax, where option parsing stops with the | |
| 95 | first non-option argument. | |
| 96 | ||
| 97 | <P> | |
| 98 | </LI> | |
| 99 | <LI> | |
| 100 | <code>set_defaults(dest=value, ...)</code> | |
| 101 | ||
| 102 | <P> | |
| 103 | Set default values for several option destinations at once. Using | |
| 104 | <tt class="method">set_defaults()</tt> is the preferred way to set default values for | |
| 105 | options, since multiple options can share the same destination. For | |
| 106 | example, if several ``mode'' options all set the same destination, any | |
| 107 | one of them can set the default, and the last one wins: | |
| 108 | <div class="verbatim"><pre> | |
| 109 | parser.add_option("--advanced", action="store_const", | |
| 110 | dest="mode", const="advanced", | |
| 111 | default="novice") # overridden below | |
| 112 | parser.add_option("--novice", action="store_const", | |
| 113 | dest="mode", const="novice", | |
| 114 | default="advanced") # overrides above setting | |
| 115 | </pre></div> | |
| 116 | ||
| 117 | <P> | |
| 118 | To avoid this confusion, use <tt class="method">set_defaults()</tt>: | |
| 119 | <div class="verbatim"><pre> | |
| 120 | parser.set_defaults(mode="advanced") | |
| 121 | parser.add_option("--advanced", action="store_const", | |
| 122 | dest="mode", const="advanced") | |
| 123 | parser.add_option("--novice", action="store_const", | |
| 124 | dest="mode", const="novice") | |
| 125 | </pre></div> | |
| 126 | ||
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| 167 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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