save project

fs.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
-while True:
+i=3
+if i=0
+    while True:
         name = input("请输入用户名:")
         name = input("请输入用户名:")
         password = input("请输入密码:")
         password = input("请输入密码:")
+        i-=1
         if name == username and password == userpassword:
         if name == username and password == userpassword:
             print("登录成功!")
             print("登录成功!")
+            i+=1
             break
             break
         if name!=username:
         if name!=username:
             print("用户名错误")
             print("用户名错误")
@@ -12,4 +16,6 @@ while True:
         if password!=userpassword:
         if password!=userpassword:
             print("密码错误")
             print("密码错误")
             continue
             continue
+    else:
+        exit()
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file