What is the handling of file operations and exceptions in python
This article shows you how to handle file operations and exceptions in python. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.
I. Operation of the file 1.1 create the file
Format: F = open ('file','w') or f = open ('file','r')
1.2 write data
Format: F = open ('file','w') or f = open ('file','r')
1.3 read data
Object = open ("file", r)
Variable = object .read ()
Print (variable)
If you open a file with open, if you use "r", you can omit it, that is, only write open ('test.txt') if there is no file, open an error, and the file can operate. If there is a Chinese display in the file, there will be garbled codes that need to be added to encoding='utf-8' open (' test.txt', "r", encoding='utf-8').
1.4.2 read data
Object = open ("file", r)
Variable = object .readlines ()
Print (variable)
1.5 read and write data
Object = open ("binary", rb)
Variable = object .read ()
Print (variable)
1.6 Delete files
1.6 write to a file
1.7 read pictures
1.8 back up pictures
With open ("binary", "wb") as object:
Variable = object .write ()
Print (variable)
1.9 File renaming
Import os
Os.rename ("File name to be modified", "New File name")
1.10 create a folder
1.11 get the current directory
1.12 read and write binaries
Know how to read and write text files to read and write binary files is also very simple, the following code to achieve the function of copying picture files.
Def main (): try: with open ('guido.jpg',' rb') as fs1: data = fs1.read () print (type (data)) # with open ('Guido. Jpg', 'wb') as fs2: fs2.write (data) except FileNotFoundError as e: print (' specified file cannot be opened.') Except IOError as e: print ('error reading and writing file') Print ('end of program execution.') if _ _ name__ = ='_ main__': main () 2.1.Demo of all kinds of exceptions
2.2 catch exception
2.3try/finally
2.4 Transmission of exceptions
2.5 trigger exception
2.6 Custom exception
The above is what the file manipulation and exception handling is like in python. Have you learned the knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.
