break up a large csv into pieces

break_up.py

import csv

def break_up(in_path):
  with open(in_path) as f_in:
    reader = csv.reader(f_in)
    chunk = 0
    while True:
      with open(f'{chunk}.csv', 'w') as f_out:
        writer = csv.writer(f_out)
        for i, row in enumerate(reader):
          writer.writerow(row)
          if i > 100:
            break
        else:
          return
      chunk += 1

break_up("big.csv")