__init__.py 文件源码

def parse(cls, src, dist=None):
        """Parse a single entry point from string `src`

        Entry point syntax follows the form::

            name = some.module:some.attr [extra1, extra2]

        The entry name and module name are required, but the ``:attrs`` and
        ``[extras]`` parts are optional
        """
        m = cls.pattern.match(src)
        if not m:
            msg = "EntryPoint must be in 'name=module:attrs [extras]' format"
            raise ValueError(msg, src)
        res = m.groupdict()
        extras = cls._parse_extras(res['extras'])
        attrs = res['attr'].split('.') if res['attr'] else ()
        return cls(res['name'], res['module'], attrs, extras, dist)