python - 如何控制用户的输入

Question

 name = input('Enter your name please: ')
 while name != str:
     name = input('Please enter only letters for your name: ')
 ss = input('Enter your Social Security Number: ')
 while ss != int:
     ss = input('Please enter only numbers for your social security number:')

所以我有这个基本程序，它询问用户他的名字和 SS#，我想这样做，用户不能在他应该输入 int 的地方输入 str 或 float。我试过了，但它会永远循环下去，因为 If 语句正在检查输入是数据类型 str 还是 int，我该如何检查变量是 int 还是 str？

Answer 1

您正在尝试将值与类型 进行比较。您应该改为存储名称并检查是否只有字母 (.isalpha()) 并尝试对安全号码进行类型转换。如果失败，则它不是有效输入。使用 isnumeric() 作为 SSN 也是一种选择。像这样的东西:

name = input('Enter your name please: ')
while not name.isalpha():
    name = input('Please enter only letters for your name: ')

ss = input('Enter your Social Security Number: ')
try:
    int(ss)
    valid_ss = True
except ValueError:
    valid_ss = False

while not valid_ss:
    ss = input('Please enter only numbers for your social security number:')
    try:
        int(ss)
        valid_ss = True
    except ValueError:
        valid_ss = False

或

name = input('Enter your name please: ')
while not name.isalpha():
    name = input('Please enter only letters for your name: ')

ss = input('Enter your Social Security Number: ')
while not ss.isnumeric():
    ss = input('Please enter only numbers for your social security number:')