python - 比较用户输入的 key :value relationship in a dictionary

Question

这个程序是一个问答游戏。我要显示键:值对的描述(值)。然后我是用户来猜测一些事情。如果他们猜出该描述的正确键，我希望程序转到下一个描述进行猜测。如果他们没有猜对，我希望程序给用户另一个猜测。

到目前为止，如果他们猜对了，程序就可以运行。如果用户猜测错误并且猜测是错误的键，则程序可以运行。如果猜测是随机的，比如“ghghghgh”，我会得到“KeyError”。

控制台:

Tasty And Juicy

What fruit does the above sentence describe per se?gh

Traceback (most recent call last):
  File "bazinga.py", line 22, in <module>
    if fruits[guess] == fruit:
KeyError: 'gh'

(program exited with code: 1)

Press any key to continue . . .

代码:

fruits = {

'apple':'tasty and juicy',
'banana':'long and squishy',
'orange':'ripe and yummy'

}


# loops through the values of the dictionary fruits
for fruit in fruits.values():
    print(fruit.title())

    correct = False
    guess = ''

    # guess is base incorrect to start the while loop
    # the while loop goes until the correct guess is declared
    while not correct:
        guess = input("\nWhat fruit does the above setence describe \
per se?")
        if fruits[guess] == fruit:
            print("\nWow what a big brain you got there!")
            corecct = True
        else:
            print("Uh-oh, uh-oh! Guess a again big buy!")

Answer 1

如果猜水果会告诉你猜测是否在字典中。

guess = input("...")
if guess in fruits and fruits[guess] == fruit:
    print("You got it")
else:
    print("Guess again")

或者，您可以使用 来代替使用 [] 来获取字典中的当前项目(正如您所发现的，如果 key 不存在，则会失败) .get()，如果找不到 key ，则返回 None:

if fruits.get(guess) == fruit: