python 3.x - How to handle the Loss connection error and BaseSSHTunnelForwarderError: Could not establish session to SSH gateway -


this code shown below use connect database , tables. have used while without problem keep on getting 2 errors after runs few times. assume database. happens can connect databases, retrieve table since data huge on loop loop through dates within given range , data. example start 20160401 , count 1 one until 20170331(about 365 loops). after run 20 loops error s

operationerror "lost connection mysql server during query (%s)" % (e,))

and 1 below

basesshtunnelforwardererror: not establish session ssh gateway

i solve errors if not possible wait few seconds reconnect databases automatically execute same query. in solving highly appreciated.

import pymysql  sshtunnel import sshtunnelforwarder    sshtunnelforwarder(         (ssh_host, ssh_port),         ssh_username=ssh_user,         ssh_pkey=mypkey,         remote_bind_address=(sql_ip, sql_port)) tunnel:         conn = pymysql.connect(host='127.0.0.1',                  user=sql_username,                 passwd=sql_password,                  port=tunnel.local_bind_port,                 db=db,charset='ujis')         data = pd.read_sql_query(query_2, conn,)

this have tried far not working 

while true:         try:             sshtunnelforwarder(                     (ssh_host, ssh_port),                     ssh_username=ssh_user,                     ssh_pkey=mypkey,                     remote_bind_address=(sql_ip, sql_port)) tunnel:                 conn = pymysql.connect(host='127.0.0.1',                                        user=sql_username,                                        passwd=sql_password,                                        port=tunnel.local_bind_port,                                        db=db, charset='ujis')                 data = pd.read_sql_query(query, conn)             break         except pymysql.err.operationalerror e:             conn.ping(reconnect=true)


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