Python Open a File using Open with Statement

Last Updated On Thursday 20th Jan 2022

Python With Open

  • Python offers several different methods for opening files
  • There’s an easier, simple, safe way to open a file, and that’s using the with statement
  • .read(size=-1) This reads based on size bytes
  • .readline(size=-1) This reads at most size number of characters from the line
  • .readlines() This reads the remaining lines from the file object and returns them as a list.
	# Use a with statement
with open('books.txt') as f:
    # Read the file
    print(f.read())
    # Your Logic goes here
	
	Three Day Road
	
  • When open is used with a with statement, a special context manager is called.
  • After the scope of the block passes, the interpreter will execute an __exit__ method on the context manager.
  • The open context manager will close the file in __exit__.
  • You have the guarantee that the file gets closed, and you do not have to do that work on your own.
  • The open context manager is probably the most common usage of the with statement.
  • with statement is used in exception handling to make the code cleaner and more readable.
  • It simplifies the management of common resources like file streams.