auto save

diy2.py

+i=3
+username = "python"
+userpassword = "123456"
+while True:
+    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("登录成功!")
+            break
+    #判断用户账号错误提示
+        if name !=username:
+            print("用户账号错误!") 
+            continue  
+    #判断用户密码错误提示
+        if password !=userpassword:
+            print("密码错误!")
+    else:
+        print("🔒")
+        exit()
+print("欢迎来到贝尔编程!")
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