Python 2.7 最大递归深度错误？

所以我对这一点很陌生（3天），我在代码学院，我为其中一个活动编写了这段代码，但当我运行它时，它会显示最大递归深度错误，我在代码学院的python控制台上运行它，同时在我自己的ipython控制台上运行。页面上的提示没有帮助，有人能解释一下如何解决这个问题吗？ 谢谢

def hotel_cost(nights):
    return (nights * 140)

def plane_ride_cost(city):
    if plane_ride_cost("Charlotte"):
        return (183)
    if plane_ride_cost("Tampa"):
        return (220)
    if plane_ride_cost("Pittsburgh"):
        return (222)
    if plane_ride_cost("Loas Angeles"):
        return (475)

def rental_car_cost(days):
    cost = days * 40
    if days >= 7:
        cost -= 50
    elif days >= 3:
        cost -= 20
    return cost    

def trip_cost(city, days):
    return hotel_cost(nights) + plane_ride_cost(city) + rental_car_cost(days)

---

可能：

def plane_ride_cost(city):
    if city == "Charlotte":
        return (183)
    if city == "Tampa":
        return (220)
    if city == "Pittsburgh":
        return (222)
    if city == "Los Angeles":
        return (475)

def hotel_cost(nights):
    return nights * 140

plane_cost = {
    'Charlotte' : 183,
    'Tampa' : 220,
    'Pittsburgh' : 222,
    'Los Angeles' : 475,
}

def plane_ride_cost(city):
    if city not in plane_cost:
        raise Exception('City "%s" not registered.' % city)
    else:
        return plane_cost[city]

def rental_car_cost(days):
    cost = days * 40
    if days >= 7:
        cost -= 50
    elif days >= 3:
        cost -= 20
    return cost    

def trip_cost(city, days):
    return hotel_cost(nights) + plane_ride_cost(city) + rental_car_cost(days)

错误是：

def plane_ride_cost(city):
    if city == "Charlotte":
        return (183)
    if city == "Tampa":
        return (220)
    if city == "Pittsburgh":
        return (222)
    if city == "Los Angeles":
        return (475)

def hotel_cost(nights):
    return nights * 140

plane_cost = {
    'Charlotte' : 183,
    'Tampa' : 220,
    'Pittsburgh' : 222,
    'Los Angeles' : 475,
}

def plane_ride_cost(city):
    if city not in plane_cost:
        raise Exception('City "%s" not registered.' % city)
    else:
        return plane_cost[city]

def rental_car_cost(days):
    cost = days * 40
    if days >= 7:
        cost -= 50
    elif days >= 3:
        cost -= 20
    return cost    

def trip_cost(city, days):
    return hotel_cost(nights) + plane_ride_cost(city) + rental_car_cost(days)

在每个递归步骤中，

plane\u-ride\u-cost（city）

称为

plane\u-ride\u-cost（“夏洛特”）

不是最好的，而是更好的方法：

def plane_ride_cost(city):
    if city == "Charlotte":
        return (183)
    if city == "Tampa":
        return (220)
    if city == "Pittsburgh":
        return (222)
    if city == "Los Angeles":
        return (475)

def hotel_cost(nights):
    return nights * 140

plane_cost = {
    'Charlotte' : 183,
    'Tampa' : 220,
    'Pittsburgh' : 222,
    'Los Angeles' : 475,
}

def plane_ride_cost(city):
    if city not in plane_cost:
        raise Exception('City "%s" not registered.' % city)
    else:
        return plane_cost[city]

def rental_car_cost(days):
    cost = days * 40
    if days >= 7:
        cost -= 50
    elif days >= 3:
        cost -= 20
    return cost    

def trip_cost(city, days):
    return hotel_cost(nights) + plane_ride_cost(city) + rental_car_cost(days)

---

编辑我注意到拼写错误：'）最好使用

dict

，如果

city

不在dict中，则提出

异常。