auto save

diy2.py

+time=3
+username = "python"
+userpassword="123456"
+while True:
+    if time>0:
+        name=input("请输入账号:")
+        password=input("请输入密码:")
+        time=time-1
+        if name == username and password == userpassword:
+            print("登录成功!欢迎来到贝尔!")
+            break
+        if name != username:
+            print("账号不存在!你还有"+str(time)+"次机会")
+            continue
+        if  password != userpassword:
+            print("密码错误!你还有"+str(time)+"次机会")
+    else:
+        print("输入多次错误,账号已冻结!")
+        exit()
+    
+