[Python] python IOError exception

I am getting the following exception in my python script. The script is running 24h*7 and it throws the below exception every two hours. Any thoughts on when this exception happen will be useful.

Traceback (most recent call last):
File "ApprovedLeadTracker.py", line 337, in ?
processSendMailTo(sendMailTo,dedup_leads,icenet_leads,dedup_leads_tot)
File "ApprovedLeadTracker.py", line 274, in processSendMailTo
ue_db.processQuery(q=query)
File "/public/gdp/trunk/src/ukl/python/database.py", line 63, in processQuery
print traceback.format_exc()
IOError: [Errno 5] Input/output error


database.py

def processQuery(self, q, locals=None, returnLastRowId = False, opt=''):
ret = None
err = ''
for i in range(2):
try:
cursor = self.getCursor(opt)
cursor.execute(q,locals)
if (returnLastRowId):
ret = cursor.lastrowid
else:
ret = cursor.fetchall()
cursor.close()
#q = cursor._last_executed
#self.log('SUCCESS',q)
return ret
except MySQLdb.OperationalError, e:
print "Exception Query:", q
print "Exception:", e
err = e
print traceback.format_exc()
self.conn = self.connect()
except Exception, e:
print "Exception Query:", q
print "Exception:", e
err = e
print traceback.format_exc()
self.conn = self.connect()
break
#q = cursor._last_executed
#self.log('FAILURE',q)
raise RuntimeError, str(err)

Continue reading...