save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
-while True:
-    name = input("请输入用户名:")
-    if name == username:
-        password = input("请输入密码:")
-        if userpassword == password:
-            print('登录成功')
-            break
+i = 1
+for i in range(4):
+    if i < 3:
+        i = i+1
+        name = input("请输入用户名:")
+        if name == username:
+            password = input("请输入密码:")
+            if userpassword == password:
+                print('登录成功')
+                print("欢迎来到贝尔编程!")
+                break
+            else:
+                print('密码错误')
         else:
         else:
-            print('密码错误')
+            print("用户名错误!请重新输入")
     else:
     else:
-        print("用户名错误!请重新输入")
-print("欢迎来到贝尔编程!")
+        print('你被锁定了')
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