psycopg2_patcher.py 文件源码

def make_psycopg_green():
    """Configure Psycopg to be used with eventlet in non-blocking way."""
    if not hasattr(extensions, 'set_wait_callback'):
        raise ImportError(
            "support for coroutines not available in this Psycopg version (%s)"
            % psycopg2.__version__)

    extensions.set_wait_callback(eventlet_wait_callback)