How to find open source data science python projects to contribute to?

I contributed a little bit with an open source python library, and I learnt a lot from the team. I really enjoyed my time there. But the problem was that most of the coding was done in C, and I don't want to go down that route at all.

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I'm looking to contribute to somewhat mature open-source projects that mainly use Python in the area of DS. But my googling skills have failed and I couldn't find any.

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