Constants

Constants for floating-point math: π, e, the infinities and NaN, and the limits of float and double.

Each is a double unless its name starts with FLOAT_; write math.PI as float for a float.

Source: runtime/math/constants.pep

PI

const PI: double = 3.141592653589793

π, the ratio of a circle’s circumference to its diameter.

const TAU: double = 6.283185307179586

τ = 2π, the angle of a full turn in radians.

const E: double = 2.718281828459045

e, the base of the natural logarithm.

const INFINITY: double = 1.0 / 0.0

Positive infinity; -math.INFINITY is negative infinity.

const NAN: double = 0.0 / 0.0

A NaN (not a number). It is not equal to anything, itself included, so test for it with is_nan(), never ==.

const DOUBLE_EPSILON: double = 2.220446049250313e-16

The gap between 1 and the next larger double, 2^-52.

const DOUBLE_MAX: double = 1.7976931348623157e308

The largest finite double.

const DOUBLE_MIN_POSITIVE: double = 2.2250738585072014e-308

The smallest positive normal double, 2^-1022.

const FLOAT_EPSILON: float = 1.1920928955078125e-7

The gap between 1 and the next larger float, 2^-23.

const FLOAT_MAX: float = 3.4028234663852886e38

The largest finite float.

const FLOAT_MIN_POSITIVE: float = 1.1754943508222875e-38

The smallest positive normal float, 2^-126.