auto save

diy2.py

+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("用户名错误")
+            continue
+        if password != userpassword:
+            print("用户名和密码错误!请重新输入")
+    else:
+        print("fuck")
+        exit()
+print("欢迎来到贝尔编程!")