如果不使用 panda 或 numpy,我如何将我的数据分成偶数列?然后总结最后一列

Without using panda or numpy, how would I separate my data into even columns? Then sum up the last column

我正在尝试调整年份、型号和价格。然后总结成本。

保存为 'car.dat' 以下数据,未转换为 csv 或使用 panda 和 numpy。

2018,Alfa Romeo Stelvio Ti,,950

2022,Mercedes-Benz E350,,950

2022,Volvo XC90,49,900

到目前为止我使用 python idle shell 3.10.4:

def main():
    file  = open('car.dat','r')
    content = file.readlines()
    #total =0
    #total =  all 3 rows.
    for line in content:
        print ('Year' 'Make/Model', 'Price')
        print ('-'*35)
        line = line.split('\n')
        print(line[0].replace(',',' ',2))
        #print ('Total'+ total)
main()

预期结果如下:

可能类似于此:

def main():
    total = 0
    print("Year".ljust(6), "Make/Model".ljust(10), "Price")
    print("-" * 35)
    with open('car.dat') as f:
        for line in f:
            year, make_model, price = line.split(",")
            print(year.ljust(6), make_model.ljust(10), price)
            total += int(price)
    print("-" * 35)
    print("total".rjust(16), str(total))

if __name__ == "__main__":
    main()