Python3.5 operation of the file

This is a python3.5 of the file operations, there are copy/rename/overwrite input/append input and so on.

Premise: In the pythonaaa/a folder of e-drive, there is a 123.txt

1) Overwrite input

>>>import os #启动模块 >>>f=open ("E:/pythonaaa/a/123.txt", "w+") #打开目标文件, w+ is opened as read and write, with r+>>> F.write ("I love Beijing Cheonan") #写入内容就是歌词7 >>>f.close () #关闭文件, this step is crucial! Have to open about.

"Supplemental" If there is no 123.txt this file under the change path, then this will directly generate 123.txt this file.

This f=open way after opening the file must close (), otherwise this file will always run in the background, under Windows use Ctrl+alt+del can see this process, if you always feel that you will forget close (), you can use the with as method, The above sentence can be written like this:

>>>with Open ("E:/pythonaaa/a/123.txt") as F:f.write ("I love Beijing Tian ' an gate")

2) Append input

If the with as method opens the file, then write defaults to append input, such as

>>> with open ("E:/pythonaaa/a/123.txt", "A") as F:f.write ("\ nthe great leader Mao \ T" lead us forward ") #\n and \s effect to see for themselves

The effect is as follows:

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If you want to use f= method, then the first line to F=open ("E:/pythonaaa/a/123.txt", "a"), where A is the meaning of Add.

3) file name change

If you want to change this 123.txt to 456.txt, it is very simple, a word can be done.

>>> Import os>>> os.rename ("E:/pythonaaa/a/123.txt", "E:/pythonaaa/a/456.txt")

This effect is immediate.

4) file copy

Want to copy E:/pythonaaa/a/123.txt to e:/pythonaaa/b This folder, also called 123.txt.

>>> Import shutil>>> shutil.copy ("E:/pythonaaa/b/123.txt", "E:/pythonaaa/a/123.txt")

The "supplemental" statement is premised on the need to have a folder B, otherwise, it will be an error.

5) Directory deletion

E:/PYTHONAAA/B/C This folder do not want to, delete it.

>>> Import shutil>>> shutil.rmtree ("e:/pythonaaa/b/c")

6) file deletion

E:/pythonaaa/b/456.txt This file does not want to, delete it.

>>> Import os>>> os.unlink ("E:/pythonaaa/b/456.txt")

The Os.remove effect is the same, as are the statements.

7) file cut and paste

E:/pythonaaa/b/123.txt clip Paste to E:/pythonaaa/a/123.txt.

>>> Import shutil>>> shutil.move ("E:/pythonaaa/b/123.txt", "E:/pythonaaa/a/123.txt")

8) Comprehensive Exercises

Request that all the. py files in the e:/pythonaaa/a be copied to the E:/ABC/CBA folder.

>>> import os>>> os.makedirs ("E:/ABC/CBA")      #建立/abc/ CBA this folder, if it is a layer of folder Os.mkdir on the line >>> def copyfiles (Sourcedir,targetdir):     For files in os.listdir (SourceDir):         sourcefile  = os.path.join (sourcedir,files)         targetfile =  os.path.join (targetdir,files)         try:             if os.path.isfile (SourceFile)  and  Sourcefile.find ('. Py ') >0:             #可以试试不加 The consequences of >0                  Shutil.move (Sourcefile,targetfile)         except  Filenotfounderror:      &nBsp;     print ("This folder does not exist, please check again!") ")             >>> copyfiles (" e:/ Pythonaaa/b "," E:/ABC/CBA ")

Either there is no error output, or there will be how many. py files will return how many times "This folder does not exist, please recheck!" ”

This article is from "Life is waiting for Gordo" blog, please make sure to keep this source http://chenx1242.blog.51cto.com/10430133/1769866

Python3.5 operation of the file