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It’s a marketing trick. First suggest an insanely high price. Customer rejects. Then suggest a lower price, but still expensive. The customer will be more inclined to buy, because the new lower price feels like a good deal in relation to the incredibly expensive old price.
If they went with the lower price right away, the customer wouldn’t be as inclined to buy because they don’t have the incredibly insane price as a reference point.
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)