def set_default_style(self, colors='lightbg'):
        """ Sets the widget style to the class defaults.

        Parameters
        ----------
        colors : str, optional (default lightbg)
            Whether to use the default light background or dark
            background or B&W style.
        """
        colors = colors.lower()
        if colors=='lightbg':
            self.style_sheet = styles.default_light_style_sheet
            self.syntax_style = styles.default_light_syntax_style
        elif colors=='linux':
            self.style_sheet = styles.default_dark_style_sheet
            self.syntax_style = styles.default_dark_syntax_style
        elif colors=='nocolor':
            self.style_sheet = styles.default_bw_style_sheet
            self.syntax_style = styles.default_bw_syntax_style
        else:
            raise KeyError("No such color scheme: %s"%colors)
 Sets the widget style to the class defaults.

        Parameters
        ----------
        colors : str, optional (default lightbg)
            Whether to use the default light background or dark
            background or B&W style.
        
angrmanagement/vendor/qtconsole/jupyter_widget.py