Traceback (most recent call last):
  File "/home/10dot9/bin/pythonscript/./hashdir.py", line 75, in <module>
    content = openfile.read()
MemoryError

#!/usr/bin/env python3
from sys import exit
from sys import version as version # needed determine Python version number
from sys import platform as platform # needed to determine OS version number
import hashlib
from os import walk
import csv
from os.path import join

print('Python Version '+ version)
print('Operating System Platform '+ platform)
print('This Python 3 script will Sha256 recurse hash files in Directory')
print(' ')

#==== Source Directory to hash
SRC_DIR = input('File path to run file hash on: \n')

#==== csv file creation
# field names 
fields = ['Sha256 File Hash', 'Full File Path']

#==== name of csv file and it place in filesystem
filename = input('Where to save the csv file: \n')

#==== writing to csv file
with open(filename, 'w') as csvfile:
    #==== creating a csv writer object
    csvwriter = csv.writer(csvfile)

    #==== writing the fields
    csvwriter.writerow(fields)


#==== recurse the Directory
print('Walking ', SRC_DIR)
files_dir = []

for root, subdirs, files in walk(SRC_DIR):
    for file in files:
        files_dir.append(join(root, file))

print('DoneWalking ', SRC_DIR) 

#==== to see full file paths in files_dir
#for f in files_dir:
#    print(f)


#==== run sha256 on file
print('Starting the hashing of files\n') 
for x in sorted(files_dir):
    hasher = hashlib.sha256()
    with open(x, 'rb') as openfile:
        content = openfile.read()
        hasher.update(content)
        print(hasher.hexdigest().upper(), x +'\n', sep=",")
        with open(filename, 'a') as csvfile:
#=========== writing data to csv file
            csvwriter = csv.writer(csvfile)
            csvwriter.writerow([hasher.hexdigest().upper(), x])

print('Done with hashing of files!')
input('Enter to close..')

Traceback (most recent call last):
  File "/usr/lib/python3.9/idlelib/run.py", line 559, in runcode
    exec(code, self.locals)
  File "/home/10dot9/bin/pythonscript/filetreeHash.py", line 75, in <module>
    content = openfile.read()
MemoryError

#==== run sha256 on file
print('Starting the hashing of files\n') 
for x in sorted(files_dir):
    hasher = hashlib.sha256()
    with open(x, 'rb') as openfile:
        content = openfile.read()
        hasher.update(content)
        print(hasher.hexdigest().upper(), x +'\n', sep=",")
        del content
        with open(filename, 'a') as csvfile:
#=========== writing data to csv file
            csvwriter = csv.writer(csvfile)
            csvwriter.writerow([hasher.hexdigest().upper(), x])

up dated friday January 07 2022 23:58
https://stackoverflow.com/questions/36099331/how-to-grab-all-files-in-a-folder-and-get-their-md5-hash-in-python
Notice that this can potentially exhaust your memory
if you happen to have a large file in that directory,
so it is better to read the file in smaller chunks
(adapted here for 1 MiB blocks):
edited Aug 25 '18 at 8:13
answered Mar 19 '16 at 8:05
Antti Haapala

https://codereview.stackexchange.com/questions/147056/short-script-to-hash-files-in-a-directory
I've used for chunk in iter(lambda: f.read(4096), b"")
which is a better approach for hashing large files
(sometimes you won't be able to fit the whole file in
memory. In that case, you'll have to read chunks
of 4096 bytes sequentially).
edited Nov 15 '16 at 15:04
answered Nov 15 '16 at 8:02
Grajdeanu Alex

#==== run sha256 on file
n = 0
print('Starting the hashing of files\n') 
for x in sorted(files_dir):
    n = n + 1
    hasher = hashlib.sha256()
    with open(x, 'rb') as openfile:
        #content = openfile.read() # old
        #hasher.update(content) # old
        # below is new to handle large files and avoid
        #     content = openfile.read()
        #     MemoryError
        for content in iter(lambda: openfile.read(2 ** 20), b""):
                hasher.update(content)
        print('file number:',n,'\n')
        print(hasher.hexdigest().upper(), x +'\n', sep=",")
        with open(filename, 'a') as csvfile:
#=========== writing data to csv file
            csvwriter = csv.writer(csvfile)
            csvwriter.writerow([hasher.hexdigest().upper(), x])