Remove an option.

def remove_option(self, section, option):
        """Remove an option."""
        if not section or section == DEFAULTSECT:
            sectdict = self._defaults
        else:
            try:
                sectdict = self._sections[section]
            except KeyError:
                raise NoSectionError(section)
        option = self.optionxform(option)
        existed = option in sectdict
        if existed:
            del sectdict[option]
        return existed