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一 文件操作
一 介绍
计算机系统分为:计算机硬件,操作系统,应用程序三部分。
我们用python或其他语言编写的应用程序若想要把数据永久保存下来,必须要保存于硬盘中,这就涉及到应用程序要操作硬件,众所周知,应用程序是无法直接操作硬件的,这就用到了操作系统。操作系统把复杂的硬件操作封装成简单的接口给用户/应用程序使用,其中文件就是操作系统提供给应用程序来操作硬盘虚拟概念,用户或应用程序通过操作文件,可以将自己的数据永久保存下来。
有了文件的概念,我们无需再去考虑操作硬盘的细节,只需要关注操作文件的流程:
#1. 打开文件,得到文件句柄并赋值给一个变量
#2. 通过句柄对文件进行操作
#3. 关闭文件
二 在python中
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
#1. 打开文件,得到文件句柄并赋值给一个变量
f=open('a.txt','r',encoding='utf-8') #默认打开模式就为r #2. 通过句柄对文件进行操作
data=f.read() #3. 关闭文件
f.close()
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
三 f=open('a.txt','r')的过程分析
#1、由应用程序向操作系统发起系统调用open(...) #2、操作系统打开该文件,并返回一个文件句柄给应用程序 #3、应用程序将文件句柄赋值给变量f
四 强调!!!
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
#强调第一点:
打开一个文件包含两部分资源:操作系统级打开的文件+应用程序的变量。在操作完毕一个文件时,必须把与该文件的这两部分资源一个不落地回收,回收方法为:
1、f.close() #回收操作系统级打开的文件
2、del f #回收应用程序级的变量 其中del f一定要发生在f.close()之后,否则就会导致操作系统打开的文件还没有关闭,白白占用资源,
而python自动的垃圾回收机制决定了我们无需考虑del f,这就要求我们,在操作完毕文件后,一定要记住f.close() 虽然我这么说,但是很多同学还是会很不要脸地忘记f.close(),对于这些不长脑子的同学,我们推荐傻瓜式操作方式:使用with关键字来帮我们管理上下文
with open('a.txt','w') as f:
pass with open('a.txt','r') as read_f,open('b.txt','w') as write_f:
data=read_f.read()
write_f.write(data)
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
#强调第二点:
f=open(...)是由操作系统打开文件,那么如果我们没有为open指定编码,那么打开文件的默认编码很明显是操作系统说了算了,操作系统会用自己的默认编码去打开文件,在windows下是gbk,在linux下是utf-8。
这就用到了上节课讲的字符编码的知识:若要保证不乱码,文件以什么方式存的,就要以什么方式打开。 f=open('a.txt','r',encoding='utf-8')
五 python2中的file与open
#首先在python3中操作文件只有一种选择,那就是open() #而在python2中则有两种方式:file()与open()
两者都能够打开文件,对文件进行操作,也具有相似的用法和参数,但是,这两种文件打开方式有本质的区别,file为文件类,用file()来打开文件,相当于这是在构造文件类,而用open()打开文件,是用python的内建函数来操作,我们一般使用open()打开文件进行操作,而用file当做一个类型,比如type(f) is file
二 打开文件的模式
文件句柄 = open('文件路径', '模式')
模式可以是以下方式以及他们之间的组合:
Character | Meaning |
‘r' | open for reading (default) |
‘w' | open for writing, truncating the file first |
‘a' | open for writing, appending to the end of the file if it exists |
‘b' | binary mode |
‘t' | text mode (default) |
‘+' | open a disk file for updating (reading and writing) |
‘U' | universal newline mode (for backwards compatibility; should not be used in new code) |
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
#1. 打开文件的模式有(默认为文本模式):
r ,只读模式【默认模式,文件必须存在,不存在则抛出异常】
w,只写模式【不可读;不存在则创建;存在则清空内容】
a, 之追加写模式【不可读;不存在则创建;存在则只追加内容】 #2. 对于非文本文件,我们只能使用b模式,"b"表示以字节的方式操作(而所有文件也都是以字节的形式存储的,使用这种模式无需考虑文本文件的字符编码、图片文件的jgp格式、视频文件的avi格式)
rb
wb
ab
注:以b方式打开时,读取到的内容是字节类型,写入时也需要提供字节类型,不能指定编码 #3. 了解部分
"+" 表示可以同时读写某个文件
r+, 读写【可读,可写】
w+,写读【可读,可写】
a+, 写读【可读,可写】 x, 只写模式【不可读;不存在则创建,存在则报错】
x+ ,写读【可读,可写】
xb
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
# 回车与换行的来龙去脉
http://www.cnblogs.com/linhaifeng/articles/8477592.html # U模式
'U' mode is deprecated and will raise an exception in future versions
of Python. It has no effect in Python 3. Use newline to control
universal newlines mode. # 总结:
在python3中使用默认的newline=None即可,换行符无论何种平台统一用\n即可
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
三 操作文件的方法
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
#掌握
f.read() #读取所有内容,光标移动到文件末尾
f.readline() #读取一行内容,光标移动到第二行首部
f.readlines() #读取每一行内容,存放于列表中 f.write('1111\n222\n') #针对文本模式的写,需要自己写换行符
f.write('1111\n222\n'.encode('utf-8')) #针对b模式的写,需要自己写换行符
f.writelines(['333\n','444\n']) #文件模式
f.writelines([bytes('333\n',encoding='utf-8'),'444\n'.encode('utf-8')]) #b模式 #了解
f.readable() #文件是否可读
f.writable() #文件是否可读
f.closed #文件是否关闭
f.encoding #如果文件打开模式为b,则没有该属性
f.flush() #立刻将文件内容从内存刷到硬盘
f.name
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
练习,利用b模式,编写一个cp工具,要求如下:
1. 既可以拷贝文本又可以拷贝视频,图片等文件
2. 用户一旦参数错误,打印命令的正确使用方法,如usage: cp source_file target_file
提示:可以用import sys,然后用sys.argv获取脚本后面跟的参数
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
import sys
if len(sys.argv) != 3:
print('usage: cp source_file target_file')
sys.exit() source_file,target_file=sys.argv[1],sys.argv[2]
with open(source_file,'rb') as read_f,open(target_file,'wb') as write_f:
for line in read_f:
write_f.write(line)
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
四 文件内光标移动
一: read(3):
1. 文件打开方式为文本模式时,代表读取3个字符
2. 文件打开方式为b模式时,代表读取3个字节
二: 其余的文件内光标移动都是以字节为单位如seek,tell,truncate
注意:
1. seek有三种移动方式0,1,2,其中1和2必须在b模式下进行,但无论哪种模式,都是以bytes为单位移动的
2. truncate是截断文件,所以文件的打开方式必须可写,但是不能用w或w+等方式打开,因为那样直接清空文件了,所以truncate要在r+或a或a+等模式下测试效果
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
import time
with open('test.txt','rb') as f:
f.seek(0,2)
while True:
line=f.readline()
if line:
print(line.decode('utf-8'))
else:
time.sleep(0.2)
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
五 文件的修改
文件的数据是存放于硬盘上的,因而只存在覆盖、不存在修改这么一说,我们平时看到的修改文件,都是模拟出来的效果,具体的说有两种实现方式:
方式一:将硬盘存放的该文件的内容全部加载到内存,在内存中是可以修改的,修改完毕后,再由内存覆盖到硬盘(word,vim,nodpad++等编辑器)
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
import os with open('a.txt') as read_f,open('.a.txt.swap','w') as write_f:
data=read_f.read() #全部读入内存,如果文件很大,会很卡
data=data.replace('alex','SB') #在内存中完成修改 write_f.write(data) #一次性写入新文件 os.remove('a.txt')
os.rename('.a.txt.swap','a.txt')
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
方式二:将硬盘存放的该文件的内容一行一行地读入内存,修改完毕就写入新文件,最后用新文件覆盖源文件
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
import os with open('a.txt') as read_f,open('.a.txt.swap','w') as write_f:
for line in read_f:
line=line.replace('alex','SB')
write_f.write(line) os.remove('a.txt')
os.rename('.a.txt.swap','a.txt')
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
练习题:
![python第六篇文件处理类型 python第六篇文件处理类型](https://image.shishitao.com:8440/aHR0cHM6Ly9jb21tb24uY25ibG9ncy5jb20vaW1hZ2VzL2NvcHljb2RlLmdpZg%3D%3D.gif?w=700&webp=1)
1. 文件a.txt内容:每一行内容分别为商品名字,价钱,个数,求出本次购物花费的总钱数
apple 10 3
tesla 100000 1
mac 3000 2
lenovo 30000 3
chicken 10 3 2. 修改文件内容,把文件中的alex都替换成SB