How to convert a decimal number into fraction?

Question

I was wondering how to convert a decimal into a fraction in its lowest form in Python.

For example:

0.25  -> 1/4
0.5   -> 1/2
1.25  -> 5/4
3         


        

Answer 1

If you'd like to print a proper fraction, this little recipe should do:

from fractions import Fraction    

def dec_to_proper_frac(dec):
    sign = "-" if dec < 0 else ""
    frac = Fraction(abs(dec))
    return (f"{sign}{frac.numerator // frac.denominator} "
            f"{frac.numerator % frac.denominator}/{frac.denominator}")

This will print as follows:

>>> dec_to_proper_frac(3.75)
>>> "3 3/4"