fString Nested forLoop

[pcsailor]

Hi all,
I'm learning about f-strings and I know in theory nested for loops can be turned into a simpler f-string, but I'm not sure how.

rows = range(1, 10)
columns = range(1, 5)
for row in rows:
  for col in columns:
    wb.active.cell(row, col).value = 'fString_forLoop'

Any clues?
thanks,
phil