如何遍歷字典並檢查輸入的有效性？

Question

如何在字典中進行迭代並在迭代循環中檢查輸入值的有效性？ 該問題在代碼中描述：

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

您可以僅在keys進行交互，而不是items 。 嘗試以下代碼：

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

要做到這一點，只需使用continue關鍵字即可。 問題是您用盡了字典。

解：

1. mydict = {'堪薩斯州'：0，'達拉斯'：0，'阿拉巴馬州：0}

   對於鍵，mydict.items（）中的值：inp = -1 while（inp = int（input（'您的數字：'+鍵））== 0）{pass}

    if inp > 0: value = inp