如果名称正确，我怎么能有一个循环？

Question

import re
username = input("Enter your name to start the test: ")
#Prompting the user to input their name

valid = re.match("^[A-Za-z]*$",username)
#A validation of letters only being used

if not valid:
    print("Error! Letters only!")
    username = input("Enter your name: ")

Answer 1

为什么不在你的病情中使用while循环。像这样的东西，你填写详细信息：

username = input("Enter your name to start the test: ")
while not re.match("^[A-Za-z]*$",username):
    print("Error! Letters only!")
    username = input("Enter your name: ")

Answer 2

试试这个：

import re

valid = False

while not valid:
    username = input("Enter your name to start the test: ")
    valid = re.match("^[A-Za-z]*$", username)

    if not valid:
        print("Error! Letters only!")