python--file operater

#!/usr/bin/env python# -*- coding: utf-8 -*-__author__ = 'Administrator'#data=open("yesterday",encoding="utf-8").read()#f=open("yesterday",encoding="utf-8")#1. f=open("yesterday2","w",encoding="utf-8")#append#f=open("yesterday2","a",encoding="utf-8")#f=open("yesterday","r",encoding="utf-8")#f=open("yesterday","r+",encoding="utf-8")  #文件句柄    读写#f=open("yesterday2","w+",encoding="utf-8")  #文件句柄    写读(X)#f=open("yesterday2","a+",encoding="utf-8")  #文件句柄    追加读写#f=open("yesterday2","rb")  #文件句柄  二进制文件f=open("yesterday2","wb")  #文件句柄  二进制文件f.write("hello binary!!!!".encode())f.close()#print(f.readline())#data=f.read()#data2=f.read()#print(data)#print("---------data2-------",data2)#f.write("我爱北上广\n")#f.write("北上广不相信泪水............")#"a" is not read,but it can write'''f.write("when i was young,i listen to the radio\n")data=f.read()print(data)'''#print(f.readlines())'''for line in f.readlines():    print(line.strip())'''#low loop'''for index,line in enumerate(f.readlines()):    if index==9:        print('----line------')        continue    print(line.strip())'''#high bige'''count=0for line in f:    if count==9:        print('----line------')        count+=1        continue    print(line)    count+=1''''''for i in range(5):    print(f.readline())''''''print(f.tell())print(f.read(5))#print(f.readline())print(f.readline())print(f.readline())print(f.readline())print(f.tell())#回溯f.seek(0)print(f.readline())print(f.encoding)#print(f.fileno())#print(f.seekable())#print(f.readable())print(f.flush())print(dir(f.buffer))'''#从“头”开始截断#f.truncate(9)#print(f.readline())'''for i in range(3):    print(f.readline())f.write("-------插入数据---------")f.write("-------插入数据---------")print(f.tell())f.seek(10)print(f.readline())f.write("second line")'''