def zfill(self, width):
        """Pad a numeric string with zeros on the left, to fill a field of the specified width.

        The string is never truncated.

        :param int width: Length of output string.
        """
        if not self.value_no_colors:
            result = self.value_no_colors.zfill(width)
        else:
            result = self.value_colors.replace(self.value_no_colors, self.value_no_colors.zfill(width))
        return self.__class__(result, keep_tags=True)
Pad a numeric string with zeros on the left, to fill a field of the specified width.

        The string is never truncated.

        :param int width: Length of output string.