sqrt(x) Square root of a non-negative number to context precision.

to_integral_exact(rounding=None, context=None) Round to the nearest integer, signaling Inexact or Rounded

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

class decimal.InvalidOperation An invalid operation was performed. Indicates that an operation

class decimal.Subnormal Exponent was lower than Emin prior to rounding. Occurs

copy_sign(other, context=None) Return a copy of the first operand with the sign set to be the same as the sign of the second

is_snan() Return

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

ln(x) Returns the natural (base e) logarithm of x.

class random.SystemRandom([seed]) Class that uses the