Split csv into X line, with or without header

file_split.py

import os


def split(filehandler, delimiter=',', row_limit=1000,
          output_name_template='output_%s.csv', output_path='.', keep_headers=True):
    import csv
    reader = csv.reader(filehandler, delimiter=delimiter)
    current_piece = 1
    current_out_path = os.path.join(
        output_path,
        output_name_template % current_piece
    )
    current_out_writer = csv.writer(open(current_out_path, 'w', newline=''), delimiter=delimiter)
    current_limit = row_limit
    if keep_headers:
        # headers = reader.next()
        headers = next(reader)
        current_out_writer.writerow(headers)
    for i, row in enumerate(reader):
        if i + 1 > current_limit:
            current_piece += 1
            current_limit = row_limit * current_piece
            current_out_path = os.path.join(
                output_path,
                output_name_template % current_piece
            )
            current_out_writer = csv.writer(open(current_out_path, 'w', newline=''), delimiter=delimiter)
            if keep_headers:
                current_out_writer.writerow(headers)
        current_out_writer.writerow(row)


if __name__ == '__main__':
    file_name = 'snakes_count_10000.csv'
    basename = os.path.splitext(file_name)[0]

    # Create folder if not exists
    try:
        os.mkdir(basename)
    except Exception as e:
        pass
    
    with open(file_name) as filehandler:
        split(filehandler, delimiter=',', row_limit=100,
              output_name_template='{}_%s.csv'.format(basename), output_path=basename, keep_headers=True)