As I try to do more useful things with Python, I need a more supportive environment for writing code than the REPL. Visual Studio Code offers a lot of nice features without the slowness one expects of a powerful IDE.
The bigger your project grows, the more dependencies it has. Python offers a simple way to capture them and let everyone on your team install the exact same versions.
As explained in the last post, pip allows you to only keep one version of a package. If you cannot keep every dependency up to date at all the times, you run into a problem. Fortunately for us, Python offers a solution for that.