A Python CSV splitter

csv_splitter.py

import os

def split(filehandler, delimiter=',', row_limit=10000,
    output_name_template='output_%s.csv', output_path='.', keep_headers=True, verbose=False):
    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'), delimiter=delimiter)
    current_limit = row_limit
    if keep_headers:
        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'), delimiter=delimiter)
            if verbose:
                print(current_out_path)
            if keep_headers:
                current_out_writer.writerow(headers)
        current_out_writer.writerow(row)

# Example usage
split(open('./metadata.csv', 'r'), row_limit=30, verbose=True)