save project

diy.py

 username = "python"   
 username = "python"   
-userpassword = "123456" 
-while True:   
-    name = input("请输入用户名")
-    if name == username:
-        password = input("请输入密码")
-        if password == userpassword:
-            print("登录成功!")
-            break
+userpassword = "123456"
+i = 3 
+while True: 
+    i -= 1
+    if i >=0: 
+        name = input("请输入用户名")
+        if name == username:
+            password = input("请输入密码")
+            if password == userpassword:
+                print("登录成功!")
+                break
+            else:
+                    print("密码错误!请重新输入")           
         else:
         else:
-            print("密码错误!请重新输入")
+            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("都说了密码错误!你咋那么强!")
+        exit()
 print("欢迎来到贝尔编程")
 print("欢迎来到贝尔编程")
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