auto save

diy4.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("账号错误！请重新输入账号！")
+            print("温馨提示:您还有"+str(i)+"次机会！")
+            continue
+        if password!=userpassword:
+            print("密码错误！请重新输入密码！")
+            print("温馨提示:您还有"+str(i)+"次机会！")
+            continue
+    else:
+        print("账号被锁定！！")
+        exit()
+print("欢迎来到2021年4月11日09:44:10!")
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