Python WiFi Example

wifi.py

# -*- coding: utf-8 -*-

import wifi


def Search():
    wifilist = []

    cells = wifi.Cell.all('wlan0')

    for cell in cells:
        wifilist.append(cell)

    return wifilist


def FindFromSearchList(ssid):
    wifilist = Search()

    for cell in wifilist:
        if cell.ssid == ssid:
            return cell

    return False


def FindFromSavedList(ssid):
    cell = wifi.Scheme.find('wlan0', ssid)

    if cell:
        return cell

    return False


def Connect(ssid, password=None):
    cell = FindFromSearchList(ssid)

    if cell:
        savedcell = FindFromSavedList(cell.ssid)

        # Already Saved from Setting
        if savedcell:
            savedcell.activate()
            return cell

        # First time to conenct
        else:
            if cell.encrypted:
                if password:
                    scheme = Add(cell, password)

                    try:
                        scheme.activate()

                    # Wrong Password
                    except wifi.exceptions.ConnectionError:
                        Delete(ssid)
                        return False

                    return cell
                else:
                    return False
            else:
                scheme = Add(cell)

                try:
                    scheme.activate()
                except wifi.exceptions.ConnectionError:
                    Delete(ssid)
                    return False

                return cell
    
    return False


def Add(cell, password=None):
    if not cell:
        return False

    scheme = wifi.Scheme.for_cell('wlan0', cell.ssid, cell, password)
    scheme.save()
    return scheme


def Delete(ssid):
    if not ssid:
        return False

    cell = FindFromSavedList(ssid)

    if cell:
        cell.delete()
        return True

    return False


if __name__ == '__main__':
    # Search WiFi and return WiFi list
    print Search()

    # Connect WiFi with password & without password
    print Connect('OpenWiFi')
    print Connect('ClosedWiFi', 'password')

    # Delete WiFi from auto connect list
    print Delete('DeleteWiFi')

Hi!

Any solution for the returned non-zero error returned by the scheme.activate() method?

Here is the complete error message below:
Traceback (most recent call last):
File "/home/pi/projects/wifi_connect.py", line 106, in
print(Connect('test', '12345678'))
File "/home/pi/projects/wifi_connect.py", line 54, in Connect
scheme.activate()
File "/home/pi/.local/lib/python3.9/site-packages/wifi/scheme.py", line 172, in activate
subprocess.check_output(['/sbin/ifdown', self.interface], stderr=subprocess.STDOUT)
File "/usr/lib/python3.9/subprocess.py", line 424, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
File "/usr/lib/python3.9/subprocess.py", line 528, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['/sbin/ifdown', 'wlan0']' returned non-zero exit status 1.