How to set variable precision for new python format option

Question

I am loving the new format option for strings containing variables, but I would like to have a variable that sets the precision through out my script and I am not sure how to do

Answer 1

Or you can use numbering.

a = 1.23456789
some_precision = 5
out_str = 'a = {0:.{1}f}'.format(a,some_precision)
print(out_str)

Ouptut:

a = 1.23457