python--file operater

旧城等待， 2022-06-04 03:15 114阅读 0赞

#!/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=0
    for 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")'''