Python文件操作：从文本末尾逆序读取数据

来源：互联网发布：linux权限数值计算器编辑：程序博客网时间：2024/06/05 04:27

class TraceManagerBase(object):    dblocation = ""    def __init__(self):        self.init()    def init(self):        self.dblocation = os.path.join(os.path.join(os.path.abspath(os.path.dirname(__file__) + os.path.sep + ".."), "data","traceCoords")) #  os.getcwd(),"data","traceCoords"        if not os.path.exists(self.dblocation):            os.makedirs(self.dblocation)    #从文件末尾向前读取，逆序    def get1(self,sn,n):        filename = "%s.txt" % sn        path = os.path.join(self.dblocation, filename)        data = []        with open(path,'r') as fs:            for i in range(n+1):                if i>0:                    fs.seek(-113*i,2) #113为每行文本的长度，包含\r\n                    data.append(fs.readline())                    print fs.tell()            #读取后几条            # fs.seek(-113*n,2)            # print fs.tell()            # data.append(fs.readlines())            # print fs.tell()            print data

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