#start
drink_list = ["Beer", "Vodka", "Fanta", "Lemon"]

if drink_list == []:
    print("no drinks in here, Good bye !")
elif drink_list != []:
    user_drink = input("what drink do you wana drink ? ")
    if user_drink == "quit":
        print("okay , good bye ! ")
# list_o_matic -->
    elif user_drink == "":
        drink_list.pop()
        print("we have ", drink_list)   # bis hier läufts 12:30 / 11.06.018

    for user_drink in drink_list: # not working
        if user_drink in drink_list == False:

            drink_list.append(user_drink)

print(drink_list)