Python os.pipe() 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
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...
