怎么改都不对关于，要怎么修改呀😭#python#的问题，请各位专家解答！

import time
import random
import threading
import sys

A1=int(input('请输入A矩阵行数A1：'))
A2=int(input('请输入A矩阵列数A2：'))
B1=int(input('请输入B矩阵行数B1：'))
B2=int(input('请输入B矩阵列数B2：'))



if B1 != A2:   #判断矩阵是否满足相乘的关系
    print('格式不规范')
    sys.exit(0)  #直接退出程序

def build(a, b):   #生成一个随机矩阵
    v = []
    for i in range(a):
        v.append([])
        for j in range(b):
            x = random.uniform(-100000, 100000)   #随机生成浮点数
            v[i].append(x)
    return v



#矩阵分块生成子矩阵
C2 = random.randint(1, A2)   #随机生成一个整数
D1= C2
C1 =random.randint(1,A1)
D2 = random.randint(1,B2)
print(C1,C2,D1,D2)

A11 = build(C1, C2)
A12 = build(C1,A2-C2)
A21 = build(A1-C1,C2)
A22 = build(A1-C1,A2-C2)

B11 = build(D1,D2)
B12 = build(D1,B2-D2)
B21 = build(B1-D1,D2)
B22 = build(B1-D1,B2-D2)
print('A11矩阵:', A11)
print('A12矩阵:', A12)
print('A21矩阵:', A21)
print('A22矩阵:', A22)
print('B11矩阵:', B11)
print('B12矩阵:', B12)
print('B21矩阵:', B21)
print('B22矩阵:', B22)
# 初始化结果矩阵 C



# Generate the submatrices A11, A12, A21, A22, B11, B12, B21, and B22 as before

def multiply_submatrices(A, B, C):
    # Multiply the submatrices A and B and store the result in C
    for i in range(len(A)):
        for j in range(len(B[0])):
            for k in range(len(B)):
                C[i][j] += A[i][k] * B[k][j]

# Create threads to multiply the submatrices in parallel
thread1 = threading.Thread(target=multiply_submatrices, args=(A11, B11, C11))
thread2 = threading.Thread(target=multiply_submatrices, args=(A12, B21, C12))
thread3 = threading.Thread(target=multiply_submatrices, args=(A11, B12, C21))
thread4 = threading.Thread(target=multiply_submatrices, args=(A12, B22, C22))
thread5 = threading.Thread(target=multiply_submatrices, args=(A21, B11, C21))
thread6 = threading.Thread(target=multiply_submatrices, args=(A22, B21, C22))
thread7 = threading.Thread(target=multiply_submatrices, args=(A21, B12, C11))
thread8 = threading.Thread(target=multiply_submatrices, args=(A22, B22, C12))

# Start the threads
thread1.start()
thread2.start()
thread3.start()
thread4.start()
thread5.start()
thread6.start()
thread7.start()
thread8.start()

# Wait for the threads to finish
thread1.join()
thread2.join()
thread3.join()
thread4.join()
thread5.join()
thread6.join()
thread7.join()
thread8.join()

# Combine the submatrices C11, C12, C21, and C22 to form the final result matrix C
C = []
for i in range(len(C11)):
    C.append(C11[i] + C12[i])
for i in range(len(C21)):
    C.append(C21[i] + C22[i])

# Print the final result matrix C
print(C)

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这段代码有以下几个问题：

• 代码中定义了四个矩阵 C11, C12, C21, C22，但没有初始化这些矩阵。在调用 multiply_submatrices 函数时，它们的值为 None，会导致错误。

• 代码中定义了四个子矩阵 A11, A12, A21, A22 和四个子矩阵 B11, B12, B21, B22，但没有给出它们的具体值。这意味着在调用 multiply_submatrices 函数时，这些子矩阵的值也为 None，会导致错误。

• 代码中定义了六个线程 thread1, thread2, thread3, thread4, thread5, thread6，但没有调用 start 方法来启动这些线程。这意味着这些线程不会执行。

• 代码中使用了 sys.exit(0) 来终止程序，但没有在终止之前等待所有线程完成。这可能会导致程序在线程尚未完成时退出，造成资源泄漏。