Libraries are collections of shared code. They're common in Python, where they're also called "modules," but they're also ...

One more note: Python is ruthlessly obedient. If you just spent 20 hours running a program and you save the file as temp_data.txt. Then later you run something and save it as temp_data.txt - done ...

One way to speed up your Python programs is to write modules in the Zig language and use them in your Python code. Here's how to get started.