File---Python

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Read file:

Fin=open ("Test.txt")
Read=fin.readline ()-----read a line
For line in Fin:
Print (line)
Fin.close ()

Read=fin.read ()----Read all content

Write file:

Fout=open (' Test.txt ', ' W ')----Erase the original contents of the file and write
Line1= ' Good afternoon '
Fout.write (line1)---Write argument must be a string
Fout.close ()

Fout=open (' Test.txt ', ' a ')----append content to the source file

Format operator---%: Converts an expression to a string

Line= ' in%d years I had spotted%g%s '% (3,0.1, ' camels ')

File name and path:

Import OS----OS W provides functions for manipulating files and directories
CWD=OS.GETCWD ()----Get the current directory

Path=os.path.abspath (' test.txt ')----get the absolute path to the file

Os.path.exists (' test.txt ')----checks if a file or directory exists, returns a Boolean type

Os.path.isdir (' test.txt ')----Check if it is a directory

Os.listdir (CWD)---Returns a list of files in the specified directory

Os.path.isfile (' Test ')---Check if it is a file

Os.path.join (dirname,name)----accept a directory and file name and spell it as a full path

Catching Exceptions:

Try
Fin=open (' Test.txt ')
For line in Fin:
Print (line)
Fin.close ()
Except
Print (' Something is wrong ')

To write a module:

If you have a file: example.py

Importing this file: import example

Using Functions in example.py: Example.linecount ()

Os.path.

File---Python