statistics.variance(data, xbar=None) Return the sample variance of data, an iterable of at least two real-valued numbers

random.randrange(stop) random.randrange(start, stop[, step]) Return a randomly selected element from range(start

cmath.isnan(x) Return True if either the real or the imaginary part of x is a NaN, and False

cmath.isclose(a, b, *, rel_tol=1e-09, abs_tol=0.0) Return True if the values a and b are close

rotate(x, y) Returns a rotated copy of x, y times.

normalize(x) Reduces x to its simplest form.

math.frexp(x) Return the mantissa and exponent of x as the pair (m, e). m is a float and e

next_toward(other, context=None) If the two operands are unequal, return the number closest to the first operand in the direction

math.isclose(a, b, *, rel_tol=1e-09, abs_tol=0.0) Return True if the values a and b are close

random.vonmisesvariate(mu, kappa) mu is the mean angle, expressed in radians between 0 and 2*pi, and kappa