Question

def hotel(days):
  return days*50

def plane_ticket(city):
  city = {"Chicago": 180, "Boston": 170, "Orlando": 160,"Ciudad de Mexico"    :100}
return city 

def car(days):
  rent=days*10

  if days >= 7:
     return rent -5
  elif days >= 5:
     return rent -1
  else:
     return rent

def trip_cost(city, days, extras):
    return sum([hotel(days),plane_ticket(city),car(days),extras])
print (trip_cost("Chicago",4,300))

我希望分配给字典中字符串的数字在总和中用作整数

Answer 1

非常简单：

def plane_ticket(city):
  cities = {"Chicago": 180, "Boston": 170, "Orlando": 160,"Ciudad de Mexico"    :100}
  return cities[city]

Answer 2

您遇到此问题，因为您的plane_ticket功能并未返回您的想法。

def plane_ticket(city):
  city = {"Chicago": 180, "Boston": 170, "Orlando": 160,"Ciudad de Mexico"    :100}
  return city

此函数返回整个字典city，而不是单个值。

你需要做这样的事情：

def plane_ticket(city):
  city_prices = {"Chicago": 180, "Boston": 170, "Orlando": 160,"Ciudad de Mexico"    :100}
  return city_prices[city]

您可能希望在此处添加一些错误检查。如果函数通过了字典中不存在的城市，那么您将收到错误。

进行上述更改后，打印出值720

Python - TypeError：+：'int'和'dict'不支持的操作数类型

2 个答案: