There are various Python libraries that are used for machine learning.

More general frameworks:

scikit-learn - Open-source ML framework in Python

Tensorflow - Comprehensive ecosystem of ML tools, libraries and community resources. Allows to easily build and deploy ML powered applications. Keras is a Deep Learning Framework built on top of Tensorflow 2.0

PyTorch - Open-source ML library based on the Torch library

More specialised frameworks / libraries:

xgboost - Open-source software library which provides a gradient boosting framework. Integrated into skikit-learn

‍