code: def _apply_style_colors(self, colors, kwds, col_num, label):
          
          style = None
          if self.style is not None:
              if isinstance(self.style, list):
                  try:
                      style = self.style[col_num]
                  except IndexError:
                      pass
              elif isinstance(self.style, dict):
                  style = self.style.get(label, style)
              else:
                  style = self.style
  
          has_color = 'color' in kwds or self.colormap is not None
          nocolor_style = style is None or re.match('[a-z]+', style) is None
          if (has_color or self.subplots) and nocolor_style:
              kwds['color'] = colors[col_num % len(colors)]
          return style, kwds
docs: Manage style and color based on column number and its label.
          Returns tuple of appropriate style and kwds which "color" may be added.