I would like to set the formatting of a number in an fstring programmatically. Specifically, I have an integer that can span several orders of magnitude and I’d like to print it using the underscore “_” delimiter, e.g.

print(f”Add {200} grams of flour.”)

The following code

When messing around in python with the exclamation mark, it said that it has to be followed by either !a, !s, or !r.
What does !a do?

I’ve tried to figure this out on my own, but I’m coming to a dead end. I’m trying to return a string from a function that I created that references amounts derived from a pandas dataframe that was created earlier in the function, and I want each variable reference to be shown as it’s own line as the output: