how to generate sha256 hash for each line of my txt file | using python version 3.6.4

[rajtekken5]

I am creating a project for generating sha256 hash from text file
I want to read each line from my text file and generate sha256 for it.

Here is the code i written but it is not correct. please see and suggest me.
my text file contains:
apple
banana
grape
watermelon
stawberry

my Code is :

import hashlib
f = open("D:/12/1.txt",'r')
x = f.readline()
while(x !=""):
    hash_object = hashlib.sha256(b'x')
    hex_dig = hash_object.hexdigest()
    print(x.strip(),"",hex_dig)
    x= f.readline()

input("Successful..Press enter to exit")