__init__.py 文件源码

def __getattr__(self, name):
        """\
        This is used to plug-in external serializers.

        When a "to_<name>" method is invoked, this method tries to find
        a ``segno.plugin.converter`` plugin with the provided ``<name>``.
        If such a plugin exists, a callable function is returned. The result
        of invoking the function depends on the plugin.
        """
        if name.startswith('to_'):
            from pkg_resources import iter_entry_points
            from functools import partial
            for ep in iter_entry_points(group='segno.plugin.converter',
                                        name=name[3:]):
                plugin = ep.load()
                return partial(plugin, self)
        raise AttributeError('{0} object has no attribute {1}'
                             .format(self.__class__, name))