[Python-Dev] float.decode()?

2002年4月15日 14:56:48 -0700

Common Lisp has a function called decode-float:
 (decode-float float) => significand, exponent, sign
 computes three values that characterize float. The first value is of
 the same type as float and represents the significand. The second
 value represents the exponent to which the radix (notated in this
 description by b) must be raised to obtain the value that, when
 multiplied with the first result, produces the absolute value of
 float. If float is zero, any integer value may be returned, provided
 that the identity shown for scale-float holds. The third value is of
 the same type as float and is 1.0 if float is greater than or equal
 to zero or -1.0 otherwise.
How hard would it be to write a method like this for Python floats? I
think it could go a long way in helping people understand how floating
point works.
 Neil