Python 写文件

import os
import subprocess

name = os.getenv('USERNAME')
driver = os.getenv('SYSTEMDRIVE')
path = driver+'/users/'+name
os.chdir(path+'/desktop')
enter='\r\n'
my_file=open('hello.bat','w')
my_file.write('@echo on'+enter)
my_file.write('color 0a'+enter)
my_file.flush()
my_file.close()
subprocess.call('hello.bat')