auto save

diy6.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
+        elif name != username:
+            print("账号名错了，请重输！")
+            print("您还有"+str(i)+"次机会")
+        elif password != userpassword:
+            print("密码错了，请重输！")
+            print("您还有"+str(i)+"次机会")
+    else:
+        print("账户已被锁定！！")
+        exit()
+print("欢迎来到贝尔编程!")
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