从Python访问环境变量 [英] Access environment variables from Python

问题描述

我设置了一个我想在我的Python应用程序中访问的环境变量。如何获取此值？

I set an environment variable that I want to access in my Python application. How do I get this value?

推荐答案

环境变量可通过 os.environ

import os
print os.environ['HOME']

或者你可以看到所有环境变量的列表使用：

Or you can see a list of all the environment variables using:

os.environ

有时你可能需要看到一个完整的列表！

As sometimes you might need to see a complete list!

# using get will return `None` if a key is not present rather than raise a `KeyError`
print os.environ.get('KEY_THAT_MIGHT_EXIST')

# os.getenv is equivalent, and can also give a default value instead of `None`
print os.getenv('KEY_THAT_MIGHT_EXIST', default_value)

在Windo上 Python默认安装 ws是 C：\Python 。如果你想在运行python时找出你可以做的：

Python default installation on Windows is C:\Python. If you want to find out while running python you can do:

import sys
print sys.prefix

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