It’s a bit difficult to read, but it’s generally best to assign a fixed-width field if you know the maximum width, rather than using the default width.
I would change the ‘pnum’ format to:
pnum = %4d
or even a wider field if ‘pnum’ will have more than 4 digits. It might be worth setting all the other fields to the widest (longest) you expect them to be in order to keep the columns aligned.
