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for example to upvote my fav authors based on category posted , upvote only newly created posts by my fav authors , something like that, i tried this https://steemit.com/howto/@felixxx/howto-steemit-bot-tutorial-for-newbies-1-votebot but it gave no post found error

Hmm ... Piston is pretty much obsolete by now.
Steem-Python should work ...

I don't use vote-bots, but they are easy to make. I just don't think they're good for Steemit ...

are there any scripts for steem-python for same?