前言

在Python编程中，我们常常需要处理大文件，而有时候需要将大文件拆分成多个小文件进行处理，例如进行数据分析、数据挖掘等等。本文将介绍Python如何实现大文件分割的方法。

完整代码如下：

import os

def split_data(file_path, num_lines_per_file, output_dir):
    with open(file_path, 'r') as f:
        lines = f.readlines()

    num_files = len(lines) // num_lines_per_file + 1
    file_count = 1  # 起始文件名
    for i in range(num_files):
        start = i * num_lines_per_file
        end = start + num_lines_per_file
        block = lines[start:end]

        output_file_name = os.path.join(output_dir, f'{file_count}.txt')
        with open(output_file_name, 'w') as f:
            for line in block:
                f.write(line)
        file_count += 1

        print(f'Saved {output_file_name} successfully.')

file_path = r'C:\Users\阿铭\Desktop\160.txt'
num_lines_per_file = 20
output_dir = r'C:\Users\阿铭\Desktop\160'  # 设置输出目录

if not os.path.isdir(output_dir):
    os.mkdir(output_dir)

split_data(file_path, num_lines_per_file, output_dir)

运行结果：

Saved C:\Users\阿铭\Desktop\160\1.txt successfully.
Saved C:\Users\阿铭\Desktop\160\2.txt successfully.
Saved C:\Users\阿铭\Desktop\160\3.txt successfully.
Saved C:\Users\阿铭\Desktop\160\4.txt successfully.
Saved C:\Users\阿铭\Desktop\160\5.txt successfully.
Saved C:\Users\阿铭\Desktop\160\6.txt successfully.
Saved C:\Users\阿铭\Desktop\160\7.txt successfully.
Saved C:\Users\阿铭\Desktop\160\8.txt successfully.

总结：

本文介绍了Python如何实现大文件分割的方法，通过编写Python程序，可以将大文件分割成多个小文件，方便进行数据处理和分析。同时，本文还介绍了os模块和sys模块的使用方法，可以帮助读者更好地理解Python编程中的文件操作和系统操作。