Source code:Lib/pipes.py
Thepipes module defines a class to abstract the concept of apipeline— a sequence of converters from one file to another.
Because the module uses/bin/sh command lines, a POSIX or compatibleshell foros.system() andos.popen() is required.
Thepipes module defines the following class:
An abstraction of a pipeline.
Example:
>>>importpipes>>>t=pipes.Template()>>>t.append('tr a-z A-Z','--')>>>f=t.open('pipefile','w')>>>f.write('hello world')>>>f.close()>>>open('pipefile').read()'HELLO WORLD'
Template objects following methods:
Restore a pipeline template to its initial state.
Return a new, equivalent, pipeline template.
Ifflag is true, turn debugging on. Otherwise, turn debugging off. Whendebugging is on, commands to be executed are printed, and the shell is givenset-x command to be more verbose.
Append a new action at the end. Thecmd variable must be a valid bourne shellcommand. Thekind variable consists of two letters.
The first letter can be either of'-' (which means the command reads itsstandard input),'f' (which means the commands reads a given file on thecommand line) or'.' (which means the commands reads no input, and hencemust be first.)
Similarly, the second letter can be either of'-' (which means the commandwrites to standard output),'f' (which means the command writes a file onthe command line) or'.' (which means the command does not write anything,and hence must be last.)
Add a new action at the beginning. Seeappend() for explanations of thearguments.
Return a file-like object, open tofile, but read from or written to by thepipeline. Note that only one of'r','w' may be given.
Copyinfile tooutfile through the pipe.
34.9.fcntl — Thefcntl andioctl system calls
34.11.resource — Resource usage information
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