code: def css_number(self, path, default=NULL, ignore_spaces=False, smart=False,
                     make_int=True):
          
  
          try:
              text = self.css_text(path, smart=smart)
              return find_number(text, ignore_spaces=ignore_spaces,
                                 make_int=make_int)
          except IndexError:
              if default is NULL:
                  raise
              else:
                  return default
docs: Find number in normalized text of node which
              matches the given css path.