#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2010 Doug Hellmann.  All rights reserved.
     #
     """Checking the sign of a value.
     """
     #end_pymotw_header
     
     import math
     
     print
     print '{:^5}  {:^5}  {:^5}  {:^5}  {:^5}'.format('f', 's', '< 0', '> 0', '= 0')
     print '{:-^5}  {:-^5}  {:-^5}  {:-^5}  {:-^5}'.format('', '', '', '', '')
     
     for f in [ -1.0,
                 0.0,
                 1.0,
                 float('-inf'),
                 float('inf'),
                 float('-nan'),
                 float('nan'),
                 ]:
         s = int(math.copysign(1, f))
         print '{:5.1f}  {:5d}  {!s:5}  {!s:5}  {!s:5}'.format(f, s, f < 0, f > 0, f==0)