When I use the Fraction class from fractions module
from fractions import Fraction
Fraction(1.2)
gives,
Fraction(5404319552844595, 4503599627370496)
whereas,
Fraction('1.2')
gives,
Fraction(6, 5)
notice that,
5404319552844595/4503599627370496
gives 1.2 as output.
Then shouldn't both give Fraction(6, 5) as output.