python 读取系统环境变量，python环境变量,#!/usr/bin/e

python 读取系统环境变量，python环境变量,#!/usr/bin/e

#!/usr/bin/env python## [SNIPPET_NAME: Read an environmental variable]# [SNIPPET_CATEGORIES: os]# [SNIPPET_DESCRIPTION: Read and print a given environmental variable]# [SNIPPET_DOCS: http://docs.python.org/library/os.html]# [SNIPPET_AUTHOR: Jono Bacon <jono@ubuntu.com>]# [SNIPPET_LICENSE: GPL]import os# display the USERNAME environmental variableprint os.getenv('USERNAME')