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
+        if name!=username :
+            print("用户名输入错误，请重输！")
+            continue
+        if password!=userpassword:
+            print("密码输入错误，请重输！")
+    else :
+        print("账号已冻结，请处理！")
+    exit()
+print("欢迎来到贝尔编程!")
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