为什么在 Python 中第二次输入后我的字典的值没有更新？

Question

I am trying to make a dictionary with the colour of cars as keys and the amount they are being input as the value, such that if "red" is input twice, the outcome would be "red cars: 2". However, after if I input a colour more than twice, it won't update.

cars = {}
i = input("Cars: ")
value = 1
while i:
    if i not in cars:
        cars[i] = value
    elif i in cars:
        cars[i] = value + 1
    i = input("Cars: ")
for i,value in sorted(cars.items()):
    print(i + " cars: " + str(value))

If I input, ie, white 3 times, I get: white cars: 2 .

Does anyone know what I'm doing wrong? Thanks in advance.

Answer 1

用cars[i] += 1替换cars[i] = value + 1