如何在python中拆分文件？

import os
import shutil

def split_file(file_path, chunk_size=1024*1024):
    file_name, file_extension = os.path.splitext(file_path)
    output_file_template = file_name + "_part{}" + file_extension
    output_file_counter = 0

    with open(file_path, "rb") as input_file:
        while True:
            chunk = input_file.read(chunk_size)
            if not chunk:
                break

            output_file_path = output_file_template.format(output_file_counter)
            with open(output_file_path, "wb") as output_file:
                output_file.write(chunk)

            output_file_counter += 1

    return output_file_counter

file_path = "path/to/your/file.ext"
chunk_size = 1024 * 1024  # 1MB
num_chunks = split_file(file_path, chunk_size)
print(f"File has been split into {num_chunks} parts.")