Question

我使用threads.编写了这个用于乘以2个矩阵的python代码。但是我给出了这个错误：

    raise self._value
NameError: global name 'A' is not defined.

我知道这是因为定义了全局A，B矩阵，但我是python中的新手，我不知道如何修复它。我该如何解决这个问题？

import numpy
import random
import numpy as np
from random import randint
import multiprocessing, numpy, ctypes

def lineMult(start):
    #global A, B, C, part
    n = len(A)
    for i in xrange(start, start+part):
        for k in xrange(n):
            for 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
    from argparse import ArgumentParser

    temp=[]
    #initializing matrices------------------
    size = int(raw_input('Enter n: '))
    print('initializing A...')
    A = []
    for i in range (0, size):
        new = []
        for j in range (0, size):
            new.append(randint(-1000,1000))
        A.append(new)
    print ('matrice A initialized with:    ',A)

    print('initializing B...')
    B = []
    for i in range (0, size):
        new = []
        for 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)

如何修复NameError：python中没有定义全局名称错误？

0 个答案: