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Decimal and fraction

Python provides two additional numeric types in standard library modules — decimal is a fixed-precision, floating-point number, and fraction is a rational type that keeps numerator and denominator explicitly. Both may be used to address inaccuracies of floating-point arithmetic:

0.1 - 0.3 -0.19999999999999998 »> from decimal import Decimal »> Decimal('0.1') - Decimal('0.3') Decimal('-0.2') »> from fractions import Fraction »> Fraction(1, 10) - Fraction(3, 10) Fraction(-1, 5) »> Fraction(1, 3) + Fraction(7, 6) Fraction(3, 2)

Fractions automatically simplify results. By fixing precision and supporting various truncation and rounding protocols, decimals are useful for monetary applications. See the Python Library Reference for details.