How to Redirect stdout To A File In Python?

In this post, we will learn How to Redirect stdout to a file in Python which we can do using an in built function called ‘sys’ which provides all the attributes of the attribute which is nothing but a file object which represents the standard output stream.


Redirect stdout

It is a file handle which is known as standard output which is used for transfer to a file we can use the function open() to open the file we want to work on or print the output as stdout is used for so we have given an example below to understand the concept and implement the function when we need in out project.

import sys

# Open a file for writing
with open( 'output.txt', 'w') as f:
    # transfer stdout to the file
    sys.stdout = f

    # Print some output
    print( 'Hello, world!')

    # Restore stdout
    sys.stdout = sys.__stdout__

Here in the example given above first, we open the file we want to operate using the built in function open(), and then assigned the file to sys. stdout as an attribute of it to Transfer stdout to the desired file, And there we can print the output that we want to operate as per our choice which we are doing using print().

And at the end restored the stdout by simply assigning it to the original. And few things we need to keep in mind here as we can also use the parameterized print() statement without using stdout also to write in the file as we had written in the file before too so for the example of the same we have given below to implement the same in another way.

# Open a file for writing
with open( 'output.txt', 'w') as f:
    # Print some output to the file
    print(' Hello, world!', file=f)

As the above code will also do the same thing as the code using stdout.

And we can also do the same thing using another way which is contextlib. redirect _stdout which Transfer temporarily for context management and an example of the same implementation is given below to understand and choose the best.

import contextlib

# Open a file for writing
with open(' output.txt', 'w') as f:
    # Use the redirect_stdout context manager to temporarily redirect stdout to the file
    with contextlib.redirect_stdout(f):
        # Print some output
        print(' Welcome, world!')

# Any subsequent output will go back to the console
print(' The end world')

The above code is also used for writing the text in the given file as the output which we had done in previously.



To know more about Redirect stdout to a file visit: by Stack over flow.

To learn more about solutions to different problems and tutorials for the concepts we need to know to work on programming along with different ways to solve any generally asked problems: How To Pass-Variables From A Java & in this Client To A Linux/Ubuntu Server Which Is Running C?.

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