compat.py 文件源码

def resolve(self, s):
            """
            Resolve strings to objects using standard import and attribute
            syntax.
            """
            name = s.split('.')
            used = name.pop(0)
            try:
                found = self.importer(used)
                for frag in name:
                    used += '.' + frag
                    try:
                        found = getattr(found, frag)
                    except AttributeError:
                        self.importer(used)
                        found = getattr(found, frag)
                return found
            except ImportError:
                e, tb = sys.exc_info()[1:]
                v = ValueError('Cannot resolve %r: %s' % (s, e))
                v.__cause__, v.__traceback__ = e, tb
                raise v