制造数据:  每行101个随机数字。

import randomdef get_file():    """    获得一个文件，如果没有，则；创建并返回，如果有，则直接返回。    :return: file    """    file = open('data.txt', 'a', encoding='utf-8')    return filedef append_data(file, data_num):    """    获取数据    :param file:    :return:    """    for i in range(data_num):        tmp_data = random.randrange(0, data_num)        tmp_data = str(tmp_data) + ' '        file.write(tmp_data)        if i != 0 and i % 100 == 0:            file.write('\n')            print(i)if __name__ == '__main__':    file = get_file()    data_num = 100000000000000000000    append_data(file, data_num)    file.close()

获取文件中的单个行：

if __name__ == '__main__':    file = open('data.txt', 'r', encoding='utf-8')    try:        while True:            line = file.readline()            if line:                words = line.split(' ')                print("line=", len(words))            else:                break    finally:        file.close()