def width(self, width=None):
if width is None:<EOL><INDENT>return self._width<EOL><DEDENT>else:<EOL><INDENT>if not is_numeric(width):<EOL><INDENT>raise TypeError("<STR_LIT>" % str(width))<EOL><DEDENT>self._width = width<EOL><DEDENT>
Returns or sets (if a value is provided) the chart's width.

        :param width: If given, the chart's width will be set to this.