如何使用 Python 将文件夹添加到 Windows PATH？

Question

I want to add a folder to the Windows PATH environment variable with Python. I tried these three code snippets but none worked:

os.environ['PATH'] += ";C:\my\folder"

and

sys.path.insert(0, os.path.abspath('C:\my\folder'))

and

if sys.platform == 'win32':
    sep = ';'
else:
    sep = ':'

os.environ['PATH'] += sep + r'"C:\my\folder"'

Answer 1

The Windows command for permanently changing the path is

setx /M path "%path%;C:\my\folder"

You can execute arbitrary shell commands via Python with os.system

import os
os.system('setx /M path "%path%;C:\my\folder"')

Note:

You need to run this with elevated privileges.

References:

• https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/setx
• https://docs.python.org/3/library/os.html#os.system

Answer 2

你应该使用：

os.environ['PATH'] += R";C:\\my\\folder"