n0env.py

import winreg
from os import getcwd

key = winreg.OpenKey(winreg.HKEY_CURRENT_USER, r"Environment", 0, winreg.KEY_READ | winreg.KEY_WRITE)
path, _ = winreg.QueryValueEx(key, "Path")
if "%N0ENV%" not in path:
    path += ";%N0ENV%"
    path=path.replace(';;',';')
    winreg.SetValueEx(key, "Path", 0, winreg.REG_EXPAND_SZ, path)

try:
    path, _ = winreg.QueryValueEx(key, "N0ENV")
    if getcwd() not in path:
        path += f";{getcwd()}"
        winreg.SetValueEx(key, "N0ENV", 0, winreg.REG_EXPAND_SZ, path)
except FileNotFoundError:
    winreg.SetValueEx(key, "N0ENV", 0, winreg.REG_EXPAND_SZ, getcwd())

winreg.CloseKey(key)