使用Python添加环境变量 [英] Add an environment variable using Python

问题描述

  import os 
 os.environ [TONY] =C：\\
  

或

  import os 
 os.putenv [TONY，C：\\] 
  

但我没有看到系统环境变量中的条目。是因为在cmd中键入set的变量列表是从机器注册表中读取的？

有没有办法在Windows上添加变量，以便显示在系统变量中？

解决方案

简短的回答：Python不能以一种方式编辑环境变量。但是，如果你想做的只是在临时修改的环境中运行某些东西，你可以使用子进程模块：

 从子进程导入os 
 Popen 
 
 myEnv = dict（os.environ）
 myEnv ['newKey'] ='newVal'
 shellCmd = Popen（[' sh'，'someScript.sh']，env = myEnv）
（shellOut，shellErr）= shellCmd.communicate（）
  

I'm trying to add an environment variable to my windows machine using python and the code is something like:

import os
os.environ["TONY"] = "C:\\"

or

import os
os.putenv["TONY", "C:\\"]

But I dont see the entry in the system environment variables. Is the because the list of variables when you type 'set' in cmd is read from the machines registry?

Is there a way to add a variable on windows so it shows up in system variables?

解决方案

Short answer: Python cannot edit environment variables in a way that sticks. BUT, if all you want to do is run something in a temporarily modified environment, you can do that with the subprocess module:

import os
from subprocess import Popen

myEnv = dict(os.environ)
myEnv['newKey'] = 'newVal'
shellCmd = Popen(['sh', 'someScript.sh'], env=myEnv)
(shellOut, shellErr) = shellCmd.communicate()

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