拆分Excel文件而不打开

Question

我在黑客马拉松或Kaggle比赛中获得excel文件，其大小以Gb为单位。如果我直接打开它或以 python 或 R 加载它，我的 8gb i7 英特尔系统崩溃。 我想知道是否有任何方法可以在不打开文件的情况下拆分文件

Answer 1

Splits a CSV file into multiple pieces.
A quick bastardization of the Python CSV library.
Arguments:
`row_limit`: The number of rows you want in each output file. 10,000 by default.
`output_name_template`: A %s-style template for the numbered output files.
`output_path`: Where to stick the output files.
`keep_headers`: Whether or not to print the headers in each output file.
Example usage:
>> from toolbox import csv_splitter;
>> csv_splitter.split(open('/home/ben/input.csv', 'r'));

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 keep_headers:
current_out_writer.writerow(headers)
current_out_writer.writerow(row)