author | johnathan.white@2718R8BGH51.accenture.com |
Mon, 08 Mar 2010 18:45:03 +0000 | |
changeset 46 | b6935a90ca64 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`pipes` --- Interface to shell pipelines |
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============================================= |
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.. module:: pipes |
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:platform: Unix |
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:synopsis: A Python interface to Unix shell pipelines. |
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.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il> |
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The :mod:`pipes` module defines a class to abstract the concept of a *pipeline* |
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--- a sequence of converters from one file to another. |
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Because the module uses :program:`/bin/sh` command lines, a POSIX or compatible |
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shell for :func:`os.system` and :func:`os.popen` is required. |
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The :mod:`pipes` module defines the following class: |
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.. class:: Template() |
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An abstraction of a pipeline. |
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Example:: |
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>>> import pipes |
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>>> t=pipes.Template() |
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>>> t.append('tr a-z A-Z', '--') |
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>>> f=t.open('/tmp/1', 'w') |
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>>> f.write('hello world') |
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>>> f.close() |
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>>> open('/tmp/1').read() |
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'HELLO WORLD' |
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.. _template-objects: |
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Template Objects |
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---------------- |
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Template objects following methods: |
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.. method:: Template.reset() |
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Restore a pipeline template to its initial state. |
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.. method:: Template.clone() |
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Return a new, equivalent, pipeline template. |
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.. method:: Template.debug(flag) |
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If *flag* is true, turn debugging on. Otherwise, turn debugging off. When |
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debugging is on, commands to be executed are printed, and the shell is given |
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``set -x`` command to be more verbose. |
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.. method:: Template.append(cmd, kind) |
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Append a new action at the end. The *cmd* variable must be a valid bourne shell |
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command. The *kind* variable consists of two letters. |
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The first letter can be either of ``'-'`` (which means the command reads its |
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standard input), ``'f'`` (which means the commands reads a given file on the |
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command line) or ``'.'`` (which means the commands reads no input, and hence |
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must be first.) |
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Similarly, the second letter can be either of ``'-'`` (which means the command |
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writes to standard output), ``'f'`` (which means the command writes a file on |
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the command line) or ``'.'`` (which means the command does not write anything, |
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and hence must be last.) |
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.. method:: Template.prepend(cmd, kind) |
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Add a new action at the beginning. See :meth:`append` for explanations of the |
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arguments. |
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.. method:: Template.open(file, mode) |
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Return a file-like object, open to *file*, but read from or written to by the |
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pipeline. Note that only one of ``'r'``, ``'w'`` may be given. |
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.. method:: Template.copy(infile, outfile) |
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Copy *infile* to *outfile* through the pipe. |
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