Python os.pipe() 方法

Python os.pipe() 方法

Python OS 文件/目錄方法

概述

os.pipe() 方法用于創(chuàng)建一個管道, 返回一對文件描述符(r, w) 分別為讀和寫。

語法

pipe()方法語法格式如下：

os.pipe()

參數(shù)

• 無

返回值

返回文件描述符對。

實例

以下實例演示了 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)

執(zhí)行以上程序輸出結(jié)果為：

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 OS 文件/目錄方法