How Python implements the pipeline

The example in this article describes how Python implements the process of piping. Share to everyone for your reference. The specific analysis is as follows:

What is the most dazzling magic that can be performed under Linux? believe that different people say different, but if there is no pipeline, then I am afraid that the magic will lose the magic

Here's how to use Python to handle these pipes.

Pipe Call subroutine

We want to use a subroutine in the program, but need dynamic transfer parameters (here is the dynamic, refers to according to the second-son program input results to determine what this input), how to do, do not panic, there are subprocess!

Below I will first introduce an example code, as well as his output results!

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#!/usr/bin/python from subprocess Import * subprocess management, can do a lot of subprocess files, we want to introduce this file P = Popen (["Cat", "n"], bufsize= 1024,stdin=pipe, Stdout=pipe, close_fds=true) # Open Program The first argument is a list (program name, parameter) # The second parameter is the buffer size # Stdin,stdout is setting whether to open these pipes, If his value is subprocess. Pipe the words, # will open, same as stdin and stderr # Close_fds set to True (unix-only) all file descriptors are closed (FIN, 0,1,2) except before subroutine execution (Fout, P.stdout) for I in Range (10): # You'll understand. ^_^ Fin.write ("line" + str (i)) fin.write (' n ') Fin.flush () print fout.readline ()

The result of his output is:

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Line0 line1 line2 line3 line4 line5 line6 line7 line8 line9

I hope this article will help you with your Python programming.