'''读取文件最后一行'''import os# 小文件：批量读取def get_last_line(filename='mark.csv'):    fullfilename = os.path.join(os.path.dirname(__file__), filename)    with open(fullfilename, 'r', encoding='utf-8') as f:        lines = f.readlines() # 批量        lastline = lines[-1]    return lastline    # 大文件：逐行读取def get_last_line2(filename='mark.csv'):    fullfilename = os.path.join(os.path.dirname(__file__), filename)    with open(fullfilename, 'r', encoding='utf-8') as f:        lastline = f.readline() # 第一行        while lastline:            line = f.readline() # 逐行            if not line: break            lastline = line    return lastlineif __name__ == '__main__':    print(get_last_line())    #print(get_last_line2())