python实现矩阵转置，乘法。 不使用numpy模块

从csv文件读取矩阵内容，实现矩阵的转置，乘法。判断是否为矩阵等功能，非矩阵时的自定义异常。不使用numpy模块。

完整代码：

import csv
import pandas as pd

# 读取文件矩阵
def read_do1():
    try:
        csv_file = csv.reader(open('A.csv', 'r'))
        content1 = []
        print("A")
        for line1 in csv_file:
            print(line1)
            content1.append(line1)
        return content1
    except:
        print("文件A.csv不存在")


def read_do2():
    try:
        csv_file = csv.reader(open('B.csv', 'r'))
        content2 = []
        print("B")
        for line2 in csv_file:
            print(line2)
            content2.append(line2)
        return content2
    except:
        print("文件B.csv不存在")


# 矩阵转置
def turn(P):
    F = []
    M = []
    for i in range(4):
        for j in range(4):
            M.append(P[j][i])
    F = [M[i:i + 4] for i in range(0, len(M), 4)]
    print("B转置后的矩阵为： ")
    for line3 in F:
        print(line3)
    return F

# 自定义异常类
class MatrixMultiError(Exception):
    def __init__(self, *args, **kwargs):
        _args = ("A矩阵的行与B矩阵的列不相等！",) + args
        super(MatrixMultiError, self).__init__(*_args, **kwargs)


# 自定义异常
class NotMatrixException(Exception):
    def __init__(self, *args, **kwargs):
        _args = ("不是矩阵",) + args
        super(NotMatrixException, self).__init__(*_args, **kwargs)

# 抛出异常
def division(a, b):
    if b != a :
        raise MatrixMultiError("两个矩阵不能相乘！")

# 抛出异常
def if_juz(M):
    n = len(M)
    for i in range(n):
        if len(M[i]) == n:
            continue
        else:
            raise NotMatrixException("不是矩阵")

# 矩阵相乘
def ju(E,F):
    print("A与B的转置C矩阵相乘得C矩阵：")
    a = len(E)
    b = len(F[0])
    H3 = []
    content3 = []
    for i in range(a):
        for j in range(a):
            max = 0
            for k in range(b):
                max = max + int(E[i][k]) * int(F[j][k])
            content3.append(max)
    H3 = [content3[i:i + 4] for i in range(0, len(content3), 4)]
    for line4 in H3:
        print(line4)
    return H3


# 判断是否为矩阵
def ifif(G):
    a = len(G[0])
    for i in range(a):
        b = len(G[i])
        if b != a:
            return 0
    return 1

def main():
    A = read_do1()
    B = read_do2()
    C = []
    n1 = ifif(A)
    n2 = ifif(B)
    if n1 != 1 and n2 != 1:
        print("A,B都不是矩阵")
        if_juz(A)
        if_juz(B)
    elif n1 == 1 and n2 != 1:
        print("B不是矩阵")
        if_juz(B)
    elif n1 != 1 and n2 == 1:
        print("A不是矩阵")
        if_juz(A)
    elif n1 == 1 and n2 == 1:
        a = len(A[0])
        b = len(B)
        D = turn(B)
        if a != b:
            division(a, b)
        else:
            C = ju(A, D)
        test = pd.DataFrame(data=C)
        test.to_csv('C.csv', index=False)



main()