How to do exception handling on multiprocessing python -

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i use multiprocessing in python code.
python code imports pysnmp , multiprocessing.
half of time code runs smoothly.
unfortunately half of other time code doesn't work , shows exception "pyasn1.error.pyasn1 error: type tagset".
code first creates "multiprocessing.dummy.pool(numofthreads)" number of threads.
calls "p.map(sendsnmpget, [iprange + '.' + str(x) x in range(1,256)])" takes function "sendsnmpget" thread function, , calls function 255 times values of "1-255".
code: 

from pysnmp.entity.rfc3413.oneliner import cmdgen pysnmp.proto.rfc1902 import integer, ipaddress, octetstring import multiprocessing.dummy import multiprocessing def snmpget(ip, community, oid, version = 1):   generator = cmdgen.commandgenerator()   comm_data = cmdgen.communitydata('server', community, version) # 1 means version snmp v2c   transport = cmdgen.udptransporttarget((ip, 161),timeout=0.5,retries=2)    real_fun = getattr(generator, 'getcmd')   res = (errorindication, errorstatus, errorindex, varbinds)\       = real_fun(comm_data, transport, oid)   if (errorstatus == 2): #is there endofmib() error       return   elif (errorindication none or errorstatus true):       open("maprinter.txt", "a") myfile: myfile.write("date is: " + datetime.datetime.now().strftime("%d-%m-%y %h:%m:%s") + " ip is: " + ip + ", response: %s\n" % varbinds)       print("ip is: " + ip + ", response: %s\n" % varbinds)   return  def sendsnmpget(ip):   return snmpget(ip, 'public', '1.3.6.1.2.1.43.5.1.1.1.1', 1)  def snmp_range(iprange, start, end):   num_threads = 4 * multiprocessing.cpu_count()   p = multiprocessing.dummy.pool(num_threads)   p.map(sendsnmpget, [iprange + '.' + str(x) x in range(start,end)])  def getipsrange(ips):   print('starting scan')   if __name__ == "__main__":       if(ips != ''): #if there ips in registry           ip in range(len(ips)):               snmp_range(ips[ip], 1, 256)   print('ending scan')   getipsrange('10.0.0')

despite use of pysnmp think exception occurs due lack of proper coding of multiprocessing. how change code handle exception or better, prevent happening?


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