[英]How to sum specific integer values of Python List
我正在嘗試使用 sum 函數對列表中的整數值求和。 不幸的是,它添加了列表的所有值,但沒有添加用戶需要的值。
這是我的代碼:
tourist_attractions = []
distance = []
entry_cost = []
for i in range(3):
tourist_attractions.append (input("Enter Tourist place: "))
tourist_distance =(int(input("Enter distance: ")))
if tourist_distance > 50:
print("Invalid Entry")
continue
if tourist_distance <= 50:
distance.append(tourist_distance)
cost = (float(input("Enter cost: ")))
if cost > 100:
print("cost must be between 1-100")
continue
if cost > 0 or cost <= 100:
entry_cost.append(cost)
print()
for line in tourist_attractions:
print("Place:", line)
for line in distance:
print("Distance:", line)
for line in entry_cost:
print("Cost:", line)
print()
number_of_places_to_visit = int(input("Total number of places to visit: "))
x = 1
while x <= number_of_places_to_visit:
select_tourist_place = input("select tourist place, 0-3: ")
x = x + 1
if select_tourist_place == "0":
print(tourist_attractions[0], distance[0], entry_cost[0])
elif select_tourist_place == "1":
print(tourist_attractions[1], distance[1], entry_cost[1])
elif select_tourist_place == "2":
print(tourist_attractions[2], distance[2], entry_cost[2])
elif select_tourist_place == "3":
print(tourist_attractions[3], distance[3], entry_cost[3])
elif select_tourist_place == "4":
print(tourist_attractions[4], distance[4], entry_cost[4])
print("total cost: " , sum(entry_cost))
結果我得到:
Enter Tourist place: London
Enter distance: 25
Enter cost: 15
Enter Tourist place: Manchester
Enter distance: 30
Enter cost: 15
Enter Tourist place: Scotland
Enter distance: 50
Enter cost: 20
Place: London
Place: Manchester
Place: Scotland
Distance: 25
Distance: 30
Distance: 50
Cost: 15.0
Cost: 15.0
Cost: 20.0
Total number of places to visit: 2
select tourist place, 0-3: 0
London 25 15.0
select tourist place, 0-5: 1
Manchester 30 15.0
total cost: 50.0
>>>
我可以理解,目前它正在總結所有附加的 entry_cost 列表,並給我總共 50 個,其中應該是來自倫敦的 15 個和來自曼徹斯特的 15 個。 有什么幫助嗎?
print("total cost: " , sum(entry_cost))
絕對說明您正在迭代所有入門成本。 您可能想要存儲選定的索引並對這些索引的條目求和。
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