def coerce(cls, string):
        """Create a :class:`Requirement` object from a given package spec."""
        match = re.match(cls.spec_regex, string)
        if not match:
            raise InvalidRequirementSpecError("could not parse requirement")
        package = match.group(1)
        if all(match.group(2, 3)):
            version = "".join(match.group(2, 3))
        else:
            version = None
        return cls(package, version)
def draw(self, context):
        props = self.layout.operator("wm.context_set_value", text="Blender (default)")
        props.data_path = "window_manager.keyconfigs.active"
        props.value = "context.window_manager.keyconfigs.default"

        # now draw the presets
        Menu.draw_preset(self, context)