python psycopg2 SSL连接数据库问题

fengdy0520

采用psycopg2连接postgresql数据库，采用SSL通道方式，如下
import psycopg2

db=..
...
port=..
connection = psycopg2.connect(database=db,user=user,password=password,host=host,port=port,sslmode="require")#,

cur = connection.cursor()
print cur
提示如下错误：
raceback (most recent call last):
  File "D:\pt.py", line 12, in <module>
    connection = psycopg2.connect(database=db,user=user,password=password,host=host,port=port,sslmode="require")#,
  File "D:\Python27\lib\site-packages\psycopg2\__init__.py", line 164, in connect
    conn = _connect(dsn, connection_factory=connection_factory, async=async)
OperationalError: SSL error: tlsv1 alert protocol version

应该是TLS版本不符合数据库端的要求，在python里面，怎么设置TLS的版本？哪位大侠懂的？