如何使用Python将文件夹临时添加到Windows PATH？

Question

How can I add multiple folders to the windows PATH in Python on Windows?

I have multiple programs (wget for windows, phantomjs, casperjs, ...) that I want to use from a python script. And I think it is a good idea to add these folders to the PATH and remove them when the script is ended but I don't know if it's possible...

Answer 1

%PATH% is an environment variable, which is visible in Python by doing this:

import os
print(os.environ['PATH'])

this is a string, which you can make arbitrary modifications to. So, you might do this:

 os.environ['PATH'] += ';C:\\wget'

Any modifications you make will only be visible in your script, and any other processes that you launch from it - you don't need to remove the modifications after you're done just to stop them persisting in the wider OS.

Answer 2

import sys

if "C:\\My_Python_Lib" not in sys.path:
    sys.path.append("C:\\My_Python_Lib")