save project

diy1.py

 username = "python"   
 username = "python"   
 userpassword = "123456"
 userpassword = "123456"
+i=3
 while Ture:
 while Ture:
+    if i>0
         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：")
         if name == username and password == userpassword:
         if name == username and password == userpassword:
             print("登陆成功")
             print("登陆成功")
+            i-=1
             break
             break
-    elif name!=username:
+        if name!=username:
             print("用户名不存在，请重新输入！")
             print("用户名不存在，请重新输入！")
-    else password!=userpassword:
+            continue
+        if password!=userpassword:
             print("用密码错误！请重新输入")
             print("用密码错误！请重新输入")
+            exit()
 print("欢迎来到贝尔编程！")
 print("欢迎来到贝尔编程！")