Python 3 - os.pipe() 方法

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  描述

  方法pipe()创建一个管道并返回一对分别可用于读写的文件描述符 (r, w)
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  句法

  以下是语法pipe()方法 -

  
  os.pipe()
  

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  参数

  NA
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  返回值

  此方法返回一对文件描述符。
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  例子

  以下示例显示了 pipe() 方法的用法。

  
  #!/usr/bin/python3
  import os, sys
  print ("The child will write text to a pipe and ")
  print ("the parent will read the text written by child...")
  # file descriptors r, w for reading and writing
  r, w = os.pipe() 
  processid = os.fork()
  if processid:
     # This is the parent process 
     # Closes file descriptor w
     os.close(w)
     r = os.fdopen(r)
     print ("Parent reading")
     str = r.read()
     print ("text =", str   )
     sys.exit(0)
  else:
     # This is the child process
     os.close(r)
     w = os.fdopen(w, 'w')
     print ("Child writing")
     w.write("Text written by child...")
     w.close()
     print ("Child closing")
     sys.exit(0)
  

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  结果

  当我们运行上面的程序时，它会产生以下结果 -

  
  The child will write text to a pipe and 
  the parent will read the text written by child...
  Parent reading
  ('text =', 'Text written by child...')
  The child will write text to a pipe and 
  the parent will read the text written by child...
  Child writing
  Child closing.