Python os.dup() Method
Python OS File/Directory Methods
Overview
The os.dup() method is used to duplicate the file descriptor fd.
Syntax
dup()The method syntax is as follows:
os.dup(fd);
Parameters
fd-- file descriptor
Return Value
Returns the duplicated file descriptor.
Example
The following example demonstrates the use of the dup() method:
#!/usr/bin/python # -*- coding: UTF-8 -*- import os, sys # 打开文件 fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT ) # 复制文件描述符 d_fd = os.dup( fd ) # 使用复制的文件描述符写入文件 os.write(d_fd, "This is test") # 关闭文件 os.closerange( fd, d_fd) print "关闭所有文件成功!!"
The output of the above program is:
All files closed successfully!!Other Extensions