云学编程的22天—【微软官方python入门教程 P40笔记】2021-11-21 P40环境变量Managing keys

云学编程的22天—【微软官方python入门教程 P40笔记】2021-11-21 P40环境变量Managing keys

Values from outside of your application

 

Connecting to a database 

Determining the operating system

Setting which need to change 

Sensitive data

Reading an environmentaal variable

import os
os_version = os.getenv('OS')
print(os_version)

Using dotenv

Store environmental variables in text file

# .env file
DATAbase = Sample_Connection_string

#app.py
from dotenv import load_dotenv
import os
load_dotenv()
database = os.getenv('DATAbase')
print(database)

插入一个中文理解（转载自知乎用户【大大的甜甜圈】）：

PS： 用 dotenv 就不用在各个文件中引入配置文件，保护敏感信息，利于后期代码维护。