python阅读器代码

#coding:utf-8
import time
tl = []   #用于存放位置
def readers(path,lines=5,auto=False,times=3):
    with open(path,"r") as f:
        f.seek(0,2)         #移动到末尾
        last = f.tell()     #记住末尾位置
        f.seek(0)           #移动到文档首部
        for i in range(lines):      #先阅读几行
            print(f.readline())
        tl.append(f.tell())         #记录位置到列表
        if auto == True:            #自动阅读
            while f.tell() < last:
                for i in range(lines):
                    print(f.readline())
                time.sleep(times)
        else:
            while f.tell() < last:
                contorl = raw_input("输入N|n向下翻页,M|m向上翻页,Q|q退出阅读! >>>")
                if contorl == "q" or contorl == "Q":
                    print("您选择退出阅读!")
                    break
                elif contorl == "n" or contorl =="N":
                    for i in range(lines):
                        print(f.readline()),
                    tl.append(f.tell())
                elif contorl == 'm' or contorl =="M":
                    if len(tl) == 1:
                        print("已经是首页啦!")
                        continue
                    elif len(tl) == 2:
                        f.seek(0)
                        for i in range(lines):
                            print(f.readline()),
                        tl.pop()
                        continue
                    else:
                        f.seek(tl[-3])
                        for i in range(lines):
                            print(f.readline()),
                        tl.pop()
            print("已经到文章底部了!")
if  __name__ == "__main__":
    #readers("1.txt",auto=True,lines=6,times=5)
    readers("1.txt")