python访问系统环境变量的方法

#--------------------------------
#      Name: enviroment_variables.py
#     Author: Kevin Harris
# Last Modified: 02/13/04
#  Description: This Python script demonstrates 
#         how to acces enviroment variables.
#--------------------------------
import os
envVar = os.environ.get( "PATHEXT" )
print( "PATHEXT = " + envVar )
input( ‘\nPress Enter to exit...‘ )