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checksum = hashlib.sha224()

with open(filepath, "rb") as f:
    lines =  f.readlines()  # Dauert Lange :P
    line_length = len(lines)
    counter = 0      
    print "Starte"
    for line in f: # for line in lines macht hier das selbe oder?
        checksum.update(line)
        # Informiere Nutzer über Fortschritt
        counter += 1
    print "Ende"
f.close()

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pv <file> | md5sum

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import hashlib
from functools import partial

def main():
    def accum(checksum, chunk):
        checksum.update(chunk)
        return checksum
    print reduce(accum, iter(partial(sys.stdin.read, 1024), ""), hashlib.sha224()).hexdigest()

    return 0

if __name__ == "__main__":
    sys.exit(main())

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str1442:~$ cat > example_text << EOF
> Dies ist ein Beispieltext.
> EOF
str1442:~$ python sha224.py < example_text 
0611fed92052d649d00b6f0c862ae9f5d953636ebc15ed334b185f88
str1442:~$ pv example_text | python sha224.py 
  27B 0:00:00 [ 326kB/s] [===============================================================================================================>] 100%            
0611fed92052d649d00b6f0c862ae9f5d953636ebc15ed334b185f88

Code: Alles auswählen

checksum = hashlib.sha224()           

filesize = os.path.getsize(filepath)
stepsize = filesize/100

print "The file size is %s bytes" % filesize
print "The stepsize is %s bytes" % stepsize
print "The error is %s" % (filesize - stepsize * 100)

with open(filepath, "rb") as f:
    counter = 0
    for line in f.read(stepsize):
        while(True):
            checksum.update(line)
            counter += stepsize
            if counter >= filesize:
                break
            f.seek(counter)
        # Calculate remainder and also use it to calculate the hash value 
        remainder = filesize - f.tell()
        print "The remainder is %s" % remainder
        checksum.update(f.read(remainder))
        print "Current position %s" % f.tell() 
        print "The file size is %s bytes" % filesize       
        break
            
        
f.close()

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import os
from functools import partial
from hashlib import sha224

def hash_file(file_obj,
              hasher,
              callback=lambda byte_count: None,
              blocksize=4096):
    
    byte_count = 0
    for block in iter(partial(file_obj.read, blocksize), ''):
        hasher.update(block)
        byte_count += len(block)
        callback(byte_count)
    return hasher.hexdigest()


def main():
    filename = 'test.iso'
    filesize = os.path.getsize(filename)
    
    def print_progress(byte_count):
        print '\r%d/%d %6.2f' % (byte_count,
                                 filesize,
                                 100.0 * byte_count / filesize),
    
    with open(filename) as iso_file:
        print hash_file(iso_file, sha224(), print_progress)