调研：
https://docs.python.org/2.7/library/os.html?highlight=os%20sys#os.environ
A mapping object representing the string environment. For example,
environ['HOME']is the pathname of your home directory (on some platforms), and is equivalent togetenv("HOME")in C.
官方解释：python2.7中os.environ表示一个字符串所对应环境的映像对象。举例：os.environ['HOME']表示你的主目录。
方法1：具体实现方式如下，主要是了解 os.environ的使用
# -*- coding: utf-8 -*-
import os
import sys
import json
import logging
requiredEnv = ['USER', 'HOME', 'PATH', 'LC_COLLATE', 'LAN', 'shell'] # 设置必要检查的环境变量
def env_check():
""" This script will check to see if all of the environment variables required are set. """
lack_env = []
env = os.environ
for per_req_env in requiredEnv:
if per_req_env not in env:
lack_env.append(per_req_env)
return lack_env
def main():
""" main func """
lack_env = env_check()
if not lack_env:
print "all of the environmentvariables required are set"
else:
print "%s environment variables required are lack set" % lack_env
if __name__ == '__main__':
main()
方法2,参见github，学习后更新
https://github.com/geekcomputers/Python/blob/master/env_check.py>
分析: 方法1是用全局变量requiredEnv维护需要检查的环境变量。方法2是维护一个conf文件
