split-big-csv-file.py

def write_batch_file(file_name, headers, part, lines):
  with open(str(file_name) + "-part-" + str(part) + ".csv", "w", newline="") as batch_file:
    batch_file.write(headers)
    batch_file.writelines(lines)

def process_csv(csv_path, batch_size):
  with open(csv_path, newline="") as csv_file:
    file_name = str(csv_file.name).replace(".csv", "")
    headers = csv_file.readline()
    count = 0
    lines = []

    for line in csv_file:
      count += 1
      lines.append(line)
      if count % batch_size == 0:
        write_batch_file(file_name, headers, count // batch_size, lines)
        lines = []

    if len(lines) > 0:
      write_batch_file(file_name, headers, (count // batch_size) + 1, lines)


#####################################
# SCRIPT STARTS RUNNING HERE
#####################################

# CSV Path Input
csv_file_path = input("CSV File Path: ")
while True:
  try:
    batch_size = int(input("Batch Size (Integer): "))
  except ValueError:
    print("Provided Batch Size is not an integer. Please try again.")
    continue
  else:
    process_csv(csv_file_path, batch_size)
    break