Question

您好我正在构建一个小项目，用户可以在该项目中输入新密钥和值。如果用户输入已经输入字典的键或值，告诉他们需要输入他们当前输入的新密钥或值，是否可以显示一条消息？

这是我目前正在使用的一些代码。

# dictionary with key:values.
reps = {'#':'A', '*':'M', '%':'N'}

### The users guess

print ("Now it's your turn to guess the rest of the letters!")

###Score
guesses = 0

### Update the dictionary with the users new guesses
while guesses < 10:
    symbol = input('Please enter the symbol: ')
    letter = input('Please enter the letter: ')
    reps[symbol] = letter

### Re printing the updated list
    for line in lines_words:
        txt = replace_all(line, reps)
        print (txt)
    guesses + 1

Answer 1

您可以使用in测试现有的键和值：

if symbol in reps:
    print("You already defined that symbol")

对于这些字母，您必须在字典中对所有值进行测试：

if letter in reps.values():
    print("You already defined that letter")

你可以将两者结合起来：

if symbol in reps or letter in reps.values():
    print("You already used either the symbol or the letter")

在python中更新字典

1 个答案: