如何使用vanilla python (不使用numpy或pandas)从csv文件中查找列的总和？

import csv

with open('file.csv', 'r') as file:
    csv_reader = csv.reader(file)

    for row in csv_reader:
        # 在这里处理每一行的数据

        column_sum = 0
        for value in row:
            column_sum += int(value)  # 假设CSV文件中的值都是整数

print("列的总和为:", column_sum)

import csv

with open('file.csv', 'r') as file:
    csv_reader = csv.reader(file)
    
    column_sum = 0
    for row in csv_reader:
        for value in row:
            column_sum += int(value)
            
print("列的总和为:", column_sum)