How can I format a decimal to always show 2 decimal places?

Question

I want to display:

49 as 49.00

and:

54.9 as 54.90

Regardless of the length of the decimal

Answer 1

what about

print round(20.2564567 , 2)    >>>>>>>        20.25


print round(20.2564567 , 4)    >>>>>>>        20.2564