I think we might be talking at cross purposes. How, in Python, do I extend a CSV with new numbers, or edit existing values? Use 'input'? I could implement an excel-like interface, but then I already have Excel.

I could just open it in a text editor I suppose, but then I have to deal with escaping, and moving around cells, and that sounds painful.

The Pandas library makes manipulating tabular data easy. And it's better than Excel when it comes to cleaning messy data.

Plus 100 for pandas. It is a truly amazing library. If I need to do some exploratory data analysis with it I'll often do so in a Jupyter notebook, but always make sure serious coding happens in a real editor like vscode.

But things really are hopeless.

Even Microsoft can't control the monster they unleashed on the world. Execs and managers using Excel instead of Planner for project tracking ("Spreadsheets are for manipulating numbers, not word processing!"). Used in that way, Excel isn't so fragile, but why is it being used at all? For f*cks sake, hasn't anyone ever heard of Word tables?

Honestly, anyone who uses Excel as a database should be exiled to... someplace where they can't do any more damage. Maybe connectivity-poor rural Arkansas. That's technological malpractice. It's indefensible, and an embarrassment to the whole tech sector that anyone is trying to excuse it.

You would read in the csv, edit what you need or add/remove data, then write a new file or overwrite the old one. You don't need to implement any interface, there are tools that do all of this. You could probably write the code up for something simple like this in the time it takes for excel to open the file and you to make the change manually by finding the field, clicking away with the mouse, and typing it into the cell. Specifics beyond that can be searched for on the internet as there are a wide variety of methods you could tailor to your purpose.