What is the difference between using Python's Invoke vs a regular shell script?

I've been reading a bit about Python's PyInvoke, and my interest was piqued. Essentially, I want to have allow users to utilize a software without needing to go through the tedious task of installing all dependencies. I was think of making a simple shell script that would do that when I stumbled upon PyInvoke. So... I am wondering if this is useful or not and what is the difference compared to just having a shell script within the directory?