add tree_DFS python code

[Logenleedev]

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1 Ignored Deployment

Name	Status	Preview	Updated
hello-algo	⬜️ Ignored (Inspect)		Dec 27, 2022 at 11:51AM (UTC)

[Logenleedev]

统一用list做为存储的数组。和其他语言的命名保持一致。之前用的是result

[krahets]

There is a previous open PR that does the same work. Sorry for closing this PR.