decimal.Decimal.ln()

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

decimal.Decimal.is_subnormal()

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

decimal.Decimal.is_zero()

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

decimal.Decimal.log10()

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

decimal.Decimal.is_normal()

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.

decimal.Decimal.is_snan()

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

decimal.Decimal.is_signed()

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

decimal.Decimal.is_qnan()

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

decimal.Decimal.is_canonical()

is_canonical() Return True if the argument is canonical and False otherwise. Currently, a Decimal instance is always canonical, so this operation always returns True.

decimal.Decimal.is_finite()

is_finite() Return True if the argument is a finite number, and False if the argument is an infinity or a NaN.