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It has been known for centuries that you see a different night sky depending on how far north or south you are. A flat earth model has to explain why northern pole star is only visible in some parts of the world, while southern cross is only visible in other parts.
Flask is a fun framework for making web apis.
Pika is a client for RabbitMQ, if you want to try message queue stuff.
Numpy and sklearn for numerical and machine learning stuff.
Matplotlib for making nice plots of your numerical stuff.
Pytorch for deep learning.
Pillow for image processing.
OpenCV for computer vision.
Pygame for 2D games (maybe a bit old, but I had lots it fun with it when I started learning programming years ago)