python script for RaspberryPi to connect wifi automatically

Question

I want to operate a WiFi dongle with RaspberryPi, (it's like a CPU without built-in WiFi). I need to write a python script which automatically scan for WiFi networks and a connection need to be automatically established with known SSID and password.

This mean that I need to provide the password for the WiFi network from a file, and the remaining thing is to do the scanning and connecting automatically.

I read a file from the Web which contains WiFi SSID name and password.

I need to write a script which scan and list current networds and match it to the SSID from the file and further to automatically create the connection to this known network.

RaspberryPi OS: Rasbian

Answer 1

Thank you all for your answers i made simple solution like below

def wifiscan():

   allSSID = Cell.all('wlan0')
   print allSSID # prints all available WIFI SSIDs
   myssid= 'Cell(ssid=vivekHome)' # vivekHome is my wifi name

   for i in range(len(allSSID )):
        if str(allSSID [i]) == myssid:
                a = i
                myssidA = allSSID [a]
                print b
                break
        else:
                print "getout"

   # Creating Scheme with my SSID.
   myssid= Scheme.for_cell('wlan0', 'home', myssidA, 'vivek1234') # vive1234 is the password to my wifi myssidA is the wifi name 

   print myssid
   myssid.save()
   myssid.activate()

wifiscan()