save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+i = 3
 while True:
 while True:
-    name = input("请输入用户名：")
-    password = input("请输入密码：")
-    if name == username and password == userpassword:
-        print("登陆成功！")
-        break
-    elif name != username:
-        print("不存在该用户，请重新输入！")
+    if i>0:   
+        name = input("请输入用户名：")
+        password = input("请输入密码：")
+        i -= 1
+        if name == username and password == userpassword:
+            print("登陆成功！")
+            break
+        elif name != username:
+            print("不存在该用户，请重新输入！")
+        else:
+            print("不存在该密码，请重新输入！")
     else:
     else:
-        print("不存在该密码，请重新输入！")
+        print("sb,请紫砂")
+        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