Create a unique identifier for a file

gistfile1.txt

def create_file_id(file_path, block_size=256):
    '''
    Function that takes a file and returns the first 10 characters of a hash of
    10 times block size in the middle of the file
    Input: File path as string
    Output: Hash of 10 blocks of 128 bits of size as string plus file size as string
    '''
    file_size = os.path.getsize(file_path)
    start_index = int(file_size / 2)
    with open(file_path, 'r') as f:
        f.seek(start_index)
        n = 1
        md5 = hashlib.md5()
        while True:
            data = f.read(block_size)
            n += 1
            if (n == 10):
                break
            md5.update(data)
    return('{}{}'.format(md5.hexdigest()[0:9],str(file_size)))

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