利用python对csv文件进行分割

有个任务，就是将一个大的csv分割为几个小的csv，当然是的包饭表头的。

于是，我想到了类似于，用双指针来做。

import csv
import os

path = '/Users/mac/Desktop/186_3.csv'

with open(path, 'r', newline='') as file:
    csvreader = csv.reader(file)
    a = next(csvreader)
    print(a)
    i = j = 1
    for row in csvreader:
        print(row)
        print(f'i is {i}, j is {j}')
        # 没1000个就j加1， 然后就有一个新的文件名
        if i % 1000 == 0:
            j += 1
            print(f"csv {j} 生成成功")
        csv_path = os.path.join('/'.join(path.split('/')[:-1]), '186_3/' + str(j) + '.csv')
        # print('/'.join(path.split('/')[:-1]))
        print(csv_path)
        # 不存在此文件的时候，就创建
        if not os.path.exists(csv_path):
            with open(csv_path, 'w', newline='') as file:
                csvwriter = csv.writer(file)
                csvwriter.writerow(['image_url'])
                csvwriter.writerow(row)
            i += 1
        # 存在的时候就往里面添加
        else:
            with open(csv_path, 'a', newline='') as file:
                csvwriter = csv.writer(file)
                csvwriter.writerow(row)
            i += 1