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, 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...
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