Getting all possible combinations of members of a list

Hi there,

I have got a list containing the make of a car and all of the possible extras that are possible with that particular make.  The list is of the following type:

[[Toyota Yaris, Sun-Roof, Air-Con, ABS, Immobiliser, Metallic Paint, Passenger Airbag, Leather Seats, Sports Suspension] , [Volkswagon Polo, Sun-Roof, Air-Con, ABS, Immobiliser, Metallic Paint, Passenger Airbag, Leather Seats, Sports Suspension, Chrome Grill, Body Coloured Mirrors]

Another list is then needed that will have the car make along with the possible combinations of extras available to the customer.  A list like this:

[[Toyota Yaris, Sun-Roof, Air-Con] , [Toyota Yaris, Metallic Paint] , [Volkswagon Polo, ABS, Immobiliser, Metallic Paint, Passenger Airbag]] and all of the other combinations.

For this I have been using the following function, but it's not working right:

def combi(listmember):
      
    first = listmember.pop()
    if len(listmember)==0:
        return [[first], []]
      
    submember = combi(listmember)
    return [[first] + lstmem for lstmem in submember] + submember


I need for all of the resulting combinations to be stored in another list and have the following format:

[[Make%Extra1*Extra2*Extra3.......] , [Make%Extra1*Extra2....] , ................]


Hope you can help,

John