Three basic questions for this:

• what is a requirements.txt file
• how do I generate/update a requirements.txt file?
• how do I install the packages from the requirements.txt file?

What is a requirements.txt file?

The requirements.txt file is used for specifying what Python packages are required …

Pretty useful to have and know and I always find something, use it, and then forget where I used it (and how) but only remember that I did it. Sigh.

Here are several useful links:

How do I make python programs behave like proper unix tools? - I like ixtmixllix's approach …