def hotel_cost():
    nights = input("how many days?")
    return 140 * nights
def plane_ride_cost():
    city = input("which city? Charlotte, Tampa, Pittsburgh or Los Angeles?")
    if city == "Charlotte":
        return 183
    elif city == "Tampa":
        return 220
    elif city == "Pittsburgh":
        return 222
    elif city == "Los Angeles":
        return 475
def rental_car_cost():
    days = input("how many days for renting a car?")
    pro_day = days * 40
    if days >= 7:
        return pro_day - 50
    elif days >=3:
        return pro_day - 20
    else:
        return pro_day
def trip_cost():
    return nights + city + pro_day + spending_money
print trip_cost(hotel_cost(),plane_ride_cost(),rental_car_cost()+  spending_money)
hi guys, can someone help me with this piece of code? i learned it on codeacademy and modified , want to make it user friendly but after running code i can choose days and after city name and after error. i am very noob in python , appreciate any kind of advice , thanks
 
     
     
     
    