将文件拆分为多个文件，一次一行

def split_file(file_path):
    with open(file_path, 'r') as file:
        lines = file.readlines()  # 读取所有行

    # 按行数拆分文件
    line_count = len(lines)
    split_count = 100  # 拆分成100个小文件
    lines_per_file = line_count // split_count  # 每个小文件的行数

    for i in range(split_count):
        start = i * lines_per_file
        end = start + lines_per_file

        # 最后一个小文件可能行数不够，需要特殊处理
        if i == split_count - 1:
            end = line_count

        # 写入拆分后的小文件
        with open(f'file_{i}.txt', 'w') as split_file:
            split_file.writelines(lines[start:end])

    print(f'文件拆分完成，共拆分成{split_count}个小文件。')

split_file('large_file.txt')