method float.as_integer_ratio() always ...

[Gribouillis]

You can get rational approximates with smaller denominators by using the fractions module

>>> from fractions import Fraction
>>> Fraction(245850922,78256779).limit_denominator(1000)
Fraction(355, 113)
>>> Fraction(245850922,78256779).limit_denominator(10000)
Fraction(355, 113)
>>> Fraction(245850922,78256779).limit_denominator(100000)
Fraction(312689, 99532)
>>> Fraction(245850922,78256779).limit_denominator(50000)
Fraction(104348, 33215)