log10(context=None) Return the base ten logarithm of the operand. The result is correctly rounded using the ROUND_HALF_EVEN rounding mode.

ln(context=None) Return the natural (base e) logarithm of the operand. The result is correctly rounded using the ROUND_HALF_EVEN rounding mode.

is_zero() Return True if the argument is a (positive or negative) zero and False otherwise.

is_subnormal(context=None) Return True if the argument is subnormal, and False otherwise.

is_snan() Return True if the argument is a signaling NaN and False otherwise.

is_signed() Return True if the argument has a negative sign and False otherwise. Note that zeros and NaNs can both carry signs.

is_qnan() Return True if the argument is a quiet NaN, and False otherwise.

is_normal(context=None) Return True if the argument is a normal finite number. Return False if the argument is zero, subnormal, infinite or a NaN.

is_nan() Return True if the argument is a (quiet or signaling) NaN and False otherwise.

is_infinite() Return True if the argument is either positive or negative infinity and False otherwise.