get_iplayer | grabbing tv and radio from BBC iPlayer

I'm looking for some advice as to how to automate commands via Terminal using a Mac.

I'm using a CLI programme called get_iPlayer which essentially allows you to download and store BBC iPlayer content locally. This isn't actually why I'm using it though. I'm collecting data about its catalogue (for academic research purposes, not commercial use) and it's been incredibly useful to that end. It caches a whole bunch of data about all the programmes in the catalogue, but not ALL of the available data.

To get that other data you have to specify the particular programme via a command in terminal which will then download a small xml file containing a relevant metadata. Here's what the command looks like:

get_iplayer --type=tv --pid --metadata-only

I have a list of all of the unique programme codes (they're called pid) in a csv file, and I'm wondering if it would be possible to automate this process. I.e. write a script that runs that line but with a different pid each time.

There are a couple of caveats worth mentioning:

1. I only really have experience of using R. I suspect python will be better, and if that's the only option, then fair enough!
2. There are 129,000 of these to look up, so if it is possible to automate this process, I would need to write a script that adds a delay between each new query so as not to kill the BBC servers!

Any advice on how to approach this would be most welcome. I have a very limited knowledge of programming, so apologies if this is a very obvious question!