Update 0297-serialize-and-deserialize-binary-tree.py

[kousukekikuchi1984]

Made the code using a queue instead of a cursor which is defined as instance variable.

• File(s) Modified: python/0297-serialize-and-deserialize-binary-tree.py
• Language(s) Used: python
• Submission URL: https://leetcode.com/problems/serialize-and-deserialize-binary-tree/submissions/978150585/

Important

Please make sure the file name is lowercase and a duplicate file does not already exist before merging.

[Ykhan799]

@kousukekikuchi1984 Thanks for your contribution 👍