Python代码：

powershell
import os
def split_file(input_file, output_dir, chunk_size):
    with open(input_file, 'rb') as f:
        index = 0
        while True:
            chunk = f.read(chunk_size)
            if not chunk:
                break
            output_file = os.path.join(output_dir, f'chunk_{index}.dat')
            with open(output_file, 'wb') as out:
                out.write(chunk)
            index += 1
def merge_files(input_dir, output_file):
    files = os.listdir(input_dir)
    files.sort()
    with open(output_file, 'wb') as out:
        for file_name in files:
            file_path = os.path.join(input_dir, file_name)
            with open(file_path, 'rb') as f:
                chunk = f.read()
                out.write(chunk)
# 切分大文件
split_file('big_file.dat', 'output_dir', 10 * 1024 * 1024)  # 每个小文件大小为10GB
# 合并小文件
merge_files('output_dir', 'merged_file.dat')