Python os.pipe() 方法

Python File(文件) 方法 Python OS 文件/目录方法


概述

os.pipe() 方法用于创建一个管道, 返回一对文件描述符(r, w) 分别为读和写。

语法

pipe()方法语法格式如下:

os.pipe()

参数

返回值

返回文件描述符对。

实例

以下实例演示了 pipe() 方法的使用:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
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)

执行以上程序输出结果为:

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

Python File(文件) 方法 Python OS 文件/目录方法

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