How can fix NameError: global name is not defined error in python? -


i wrote python code multiplying 2 matrices using threads.but gave error:

    raise self._value nameerror: global name 'a' not defined.

i know it's because of defining global a,b matrices i'm new in python , don't know how fix it. how can fix problem?

import numpy import random import numpy np random import randint import multiprocessing, numpy, ctypes  def linemult(start):     #global a, b, c, part     n = len(a)     in xrange(start, start+part):         k in xrange(n):             j in xrange(n):                 c[i][j] += a[i][k] * b[k][j]  def creationthreads(a, b, threadnumber):     n = len(a)     pool = multiprocessing.pool(threadnumber)     pool.map(linemult, range(0,n, part))     return c  if __name__ == "__main__":     import argparse, sys     argparse import argumentparser      temp=[]     #initializing matrices------------------     size = int(raw_input('enter n: '))     print('initializing a...')     = []     in range (0, size):         new = []         j in range (0, size):             new.append(randint(-1000,1000))         a.append(new)     print ('matrice initialized with:    ',a)      print('initializing b...')     b = []     in range (0, size):         new = []         j in range (0, size):             new.append(randint(-1000,1000))         b.append(new)     print ('matrice b initialized with:    ',b)      # #finish initializing matrices      threadnumber = 2     part=size / threadnumber     if part < 1:         part = 1     temp= creationthreads(a, b, threadnumber)


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