Pandas for Everyone: Python Data Analysis, 2nd Edition

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Functions

Functions are one of the cornerstones of programming. They provide a way to reuse code. If you’ve ever copy-pasted lines of code just to change a few parameters, then turning those lines of code into a function not only makes your code more readable but also prevents you from making mistakes later on. Every time code is copy-pasted, it adds another place to look if a correction is needed, and puts that burden on the programmer. When you use a function, you need to make a correction only once, and it will be applied every time the function is called.

I highly suggest the Software-Carpentry Python episode on functions for more details.¹ An empty function looks like this:

1. https://swcarpentry.github.io/python-novice-inflammation/08-func/index.html ...