Question

如何迭代字典并在迭代循环期间检查输入值的有效性？问题在代码中描述：

mydict ={'Kansas': 0, 'Dallas': 0, 'Alabama': 0} 

for key, value in mydict.items():
    inp = int(input('Your number for: ' + key))

    if inp > 0:
        value = inp
    else:
        print('enter again') #<---how can I jump back to the key
                             #    for which the entry was false
                             #    and ask again for the entry?

Answer 1

for key, value in mydict.items():
    while True:
        try:
            inp = int(input('Your number for: ' + key))
        except:
            inp = 0

        if inp > 0:
                mydict[keu] = inp
                break
        print('enter again')

Answer 2

mydict ={'Kansas': 0, 'Dallas': 0, 'Alabama': 0} 

for key, value in mydict.items():
    inp = int(input('Your number for: ' + key))
    while inp <= 0:
        inp = int(input('Enter again for: ' + key))
    value = inp

Answer 3

如果keys，您可以在items上进行互动。请尝试以下代码：

my_dict = {'Kansas': 0, 'Dallas': 0, 'Alabama': 0} 

for key in my_dict.keys():
    inp = int(input('Your number for: {} '.format(key)))
    while inp <= 0:
        inp = int(input('Your number for: {} '.format(key)))
    my_dict[key] = inp

Answer 4

要完成此操作，只需使用continue关键字即可。问题是你正在用尽字典。

解决方案：

mydict = {'堪萨斯'：0，'达拉斯'：0，'阿拉巴马'：0}

表示密钥，mydict.items（）中的值：inp = -1 while（inp = int（输入（'你的数字为：'+键））== 0）{pass}
```
if inp > 0:
    value = inp
```

如何遍历字典并检查输入的有效性？

4 个答案: