I haven't looked for this in the doc, but the f-string formatting is recursive: >>> import math >>> num_value = math.pi # to get long fractional part >>>

I haven't looked for this in the doc, but the f-string formatting is recursive: >>> import math >>> num_value = math.pi # to get long fractional part >>> precision = 2 >>> print(f'{num_value:.{precision}f}') 3.14 >>> precision = 5 >>> print(f'{num_value:.{precision}f}') 3.14159