pymysql - 谷歌云 - OperationalError：（2003，“无法连接到MySQL服务器上
问题描述：
我的Python代码非常简单：pymysql - 谷歌云 - OperationalError：（2003，“无法连接到MySQL服务器上
import pymysql as pymysql
db = pymysql.connect(
host='*.172', user="*one", passwd=CLOUDSQL_PASSWORD,
database='my_db_name')
我已经创建了这里的MySQL实例：
创建一个数据库，在这里：
而且gaveaccess这里的用户：
但我不断收到以下错误：
---------------------------------------------------------------------------
OperationalError Traceback (most recent call last)
<ipython-input-53-1f1166ca5290> in <module>()
1 db = pymysql.connect(
2 host='*.172', user=CLOUDSQL_USER, passwd=CLOUDSQL_PASSWORD,
----> 3 database='*one')
C:\ProgramData\Anaconda2\lib\site-packages\pymysql\__init__.pyc in Connect(*args, **kwargs)
88 """
89 from .connections import Connection
---> 90 return Connection(*args, **kwargs)
91
92 from . import connections as _orig_conn
C:\ProgramData\Anaconda2\lib\site-packages\pymysql\connections.pyc in __init__(self, host, user, password, database, port, unix_socket, charset, sql_mode, read_default_file, conv, use_unicode, client_flag, cursorclass, init_command, connect_timeout, ssl, read_default_group, compress, named_pipe, no_delay, autocommit, db, passwd, local_infile, max_allowed_packet, defer_connect, auth_plugin_map, read_timeout, write_timeout, bind_address)
704 self._sock = None
705 else:
--> 706 self.connect()
707
708 def _create_ssl_ctx(self, sslp):
C:\ProgramData\Anaconda2\lib\site-packages\pymysql\connections.pyc in connect(self, sock)
961 exc.traceback = traceback.format_exc()
962 if DEBUG: print(exc.traceback)
--> 963 raise exc
964
965 # If e is neither DatabaseError or IOError, It's a bug.
OperationalError: (2003, "Can't connect to MySQL server on '*.172' (timed out)")
任何帮助，将不胜感激。