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?
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()
If you're getting an error because the program you're running is not defined in the Windows Environment path and you don't want to ask the user to do that manually then a workaround is to specify the full location of the exe file such as in this example in the picture
