auto save

diy2.py

+username = "python"
+userpassword = "123456"
+while True:
+    name = input("请输入用户名:")
+    password = input("请输入密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+    elif name != username:
+        print("名字不对")    
+#        break
+#    if name!=username:
+#        print("名字不对")
+#    if password!=userpassword:
+#       print("账号不对")
+print("欢迎来到贝尔编程!")
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