Multiple-precision Rationals

gmpy2 provides a rational type call mpq. It should be a replacement for Python’s fractions.Fraction module.

>>> import gmpy2
>>> from gmpy2 import mpq
>>> mpq(1,7)
mpq(1,7)
>>> mpq(1,7) * 11
mpq(11,7)
>>> mpq(11,7)/13
mpq(11,91)

mpq Methods

digits(...)
x.digits([base=10]) returns a Python string representing x in the given base (2 to 62, default is 10). A leading ‘-‘ is present if x < 0, but no leading ‘+’ is present if x >= 0.

mpq Attributes

denominator
x.denomintor returns the denominator of x.
numerator
x.numerator returns the numerator of x.

mpq Functions

add(...)
add(x, y) returns x + y. The result type depends on the input types.
div(...)
div(x, y) returns x / y. The result type depends on the input types.
f2q(...)
f2q(x[, err]) returns the best mpq approximating x to within relative error err. Default is the precision of x. If x is not an mpfr, it is converted to an mpfr. Uses Stern-Brocot tree to find the best approximation. An mpz is returned if the the denominator is 1. If err < 0, then the relative error sought is 2.0 ** err.
mpq(...)

mpq() returns an mpq object set to 0/1.

mpq(n) returns an mpq object with a numeric value n. Decimal and Fraction values are converted exactly.

mpq(n, m) returns an mpq object with a numeric value n / m.

mpq(s[, base=10]) returns an mpq object from a string s made up of digits in the given base. s may be made up of two numbers in the same base separated by a ‘/’ character. If base == 10, then an embedded ‘.’ indicates a number with a decimal fractional part.

mul(...)
mul(x, y) returns x * y. The result type depends on the input types.
qdiv(...)
qdiv(x[, y=1]) returns x/y as mpz if possible, or as mpq if x is not exactly divisible by y.
sub(...)
sub(x, y) returns x - y. The result type depends on the input types.