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我有这个小小的信用卡验证程序,用户必须输入一个8位整数。该程序工作正常,我唯一的问题似乎是限制用户输入只有8位数字。限制用户整数输入为8位
prompt = "Please, enter the 8 digit number of your card: "
while True:
try:
userinput = int(raw_input(prompt))
except ValueError:
print('The gematric value must be an 8 digit integer. Try again')
else:
break
userinput = str(userinput)
a = int(userinput[7])+int(userinput[5])+int(userinput[3])+int(userinput[1])
b1 = str(int(userinput[6])*20)
b2 = str(int(userinput[4])*20)
b3 = str(int(userinput[2])*20)
b4 = str(int(userinput[0])*20)
y = int(b1[0])+int(b1[1])+int(b2[0])+int(b2[1])+int(b3[0])+int(b3[1])+int(b4[0])+int(b4[1])
x = (a+y)
if x % 10 == 0:
print('The card number you entered is valid!')
else:
print('The card number you entered is invalid!')
我知道LEN()不能与整数工作。那么我如何将8位数的限制合并到我的while循环中呢?
任何帮助,将不胜感激。
太棒了,我只是改变了> to!=,它的工作完美。谢谢。 – Manifold