code: def get_style(self, style):
          
          style_key = tuple(style.items())
          s = self.STYLE_FACTORY.get(style_key, None)
          if s is None:
              s = xlwt.XFStyle()
              for key, values in style.items():
                  if key == "background":
                      p = xlwt.Pattern()
                      for attr, value in values:
                          p.__setattr__(attr, value)
                      s.pattern = p
                  elif key == "format":
                      s.num_format_str = values
                  elif key == "alignment":
                      a = xlwt.Alignment()
                      for attr, value in values:
                          a.__setattr__(attr, value)
                      s.alignment = a
                  elif key == "border":
                      b = xlwt.Formatting.Borders()
                      for attr, value in values:
                          b.__setattr__(attr, value)
                      s.borders = b
                  elif key == "font":
                      f = self.get_font(values)
                      s.font = f
              self.STYLE_FACTORY[style_key] = s
          return s
docs: Style is a dict maping key to values.
          Valid keys are: background, format, alignment, border
  
          The values for keys are lists of tuples containing (attribute,
          value) pairs to set on model instances...