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| 17 | <title>8.12 pipes -- Interface to shell pipelines</title> | |
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| 54 | ||
| 55 | <H1><A NAME="SECTION00101200000000000000000"> | |
| 56 | 8.12 <tt class="module">pipes</tt> -- | |
| 57 | Interface to shell pipelines</A> | |
| 58 | </H1> | |
| 59 | ||
| 60 | <P> | |
| 61 | <A NAME="module-pipes"></A> | |
| 62 | <p class="availability">Availability: <span | |
| 63 | class="platform">Unix</span>.</p> | |
| 64 | ||
| 65 | <P> | |
| 66 | The <tt class="module">pipes</tt> module defines a class to abstract the concept of | |
| 67 | a <em>pipeline</em> -- a sequence of convertors from one file to | |
| 68 | another. | |
| 69 | ||
| 70 | <P> | |
| 71 | Because the module uses <b class="program">/bin/sh</b> command lines, a POSIX or | |
| 72 | compatible shell for <tt class="function">os.system()</tt> and <tt class="function">os.popen()</tt> | |
| 73 | is required. | |
| 74 | ||
| 75 | <P> | |
| 76 | The <tt class="module">pipes</tt> module defines the following class: | |
| 77 | ||
| 78 | <P> | |
| 79 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 80 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3031' xml:id='l2h-3031' class="class">Template</tt></b>(</nobr></td> | |
| 81 | <td><var></var>)</td></tr></table></dt> | |
| 82 | <dd> | |
| 83 | An abstraction of a pipeline. | |
| 84 | </dl> | |
| 85 | ||
| 86 | <P> | |
| 87 | Example: | |
| 88 | ||
| 89 | <P> | |
| 90 | <div class="verbatim"><pre> | |
| 91 | >>> import pipes | |
| 92 | >>> t=pipes.Template() | |
| 93 | >>> t.append('tr a-z A-Z', '--') | |
| 94 | >>> f=t.open('/tmp/1', 'w') | |
| 95 | >>> f.write('hello world') | |
| 96 | >>> f.close() | |
| 97 | >>> open('/tmp/1').read() | |
| 98 | 'HELLO WORLD' | |
| 99 | </pre></div> | |
| 100 | ||
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| 105 | <!--Table of Child-Links--> | |
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| 107 | ||
| 108 | <UL CLASS="ChildLinks"> | |
| 109 | <LI><A href="template-objects.html">8.12.1 Template Objects</a> | |
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| 148 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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