Returns the completed progress bar.

        Positional arguments:
        width -- the width of the entire bar (including borders).

def bar(self, width, **_):
        """Returns the completed progress bar.

        Positional arguments:
        width -- the width of the entire bar (including borders).
        """
        return self.CHAR_LEFT_BORDER + self.CHAR_EMPTY * (width - self._width_offset) + self.CHAR_RIGHT_BORDER