proxy.py 文件源码

def connect(self, uri, opts=None, **kwargs):
        """Establish connection to a real engine.
        """
        key = "%s(%s,%s)" % (uri, repr(opts), repr(kwargs))
        try:
            map = self.storage.connection
        except AttributeError:
            self.storage.connection = {}
            self.storage.engine = None
            map = self.storage.connection
        try:
            self.engine = map[key]
        except KeyError:
            map[key] = create_engine(uri, opts, **kwargs)
            self.storage.engine = map[key]