自学教程：Python os.pipe() 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

• 无

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, sysprint "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 writingr, 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 andthe parent will read the text written by child...Parent readingChild writingChild closingtext = Text written by child...