This post explains what a Python module is and how to use it to drastically extend the capabiltiies of your code. Plus: how to make your own!

Second, when you import a module in Python, all code in that module will be executed. This can significantly slow things down if there are lots of submodules to import.

What does DLL load failed while importing mean? The ImportError: DLL load failed error basically occurs when importing Python libraries like NumPy, Pandas, PySide2, etc.