Python os.dup () method
Python OS file / directory methods
Outline
os.dup () method is used to copy the file descriptor fd.
grammar
dup () method syntax is as follows:
os.dup(fd);
parameter
fd - file descriptor
return value
Copy the file descriptor returned.
Examples
The following example demonstrates the use 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 above program output is:
关闭所有文件成功!!