Use the Python code given to calculate the SHA$256$ of a text of your choice.

import hashlib

BUF$\_$SIZE $=32768$ # Read file in $32$kb

hash$\_$object $=$ hashlib.sha$256()$

with open$(\text{'}\text{'},\text{'}$rb$\text{'})$ as f:

while True:

data $=$ f$.$read$($BUF$\_$SIZE$)$

hash$\_$object.update$($data$)$

if not data:

break

hex$\_$dig $=$ hash$\_$object.hexdigest$()$

$*$Extend the code to calculate the hash of a file $($you may use it on the excel files you created in the previous practical sessions$)$ and store the hash in a text file $$hash$.$txt

$*$Make small changes to the file and calculate the hash again. Add the new hash to $$hash$.$txt$$ and compare them. What do you notice?