Class for finding hashes without reading the whole file at once

hash_finder.py

import os
import platform
import hashlib

sistem = platform.system().lower()

if sistem == "linux" or sistem == "linux2" or sistem == "darwin":
    SLASH = "/"
elif sistem == "windows":
    SLASH = "\\"
    
class Dosya:
    def __init__(self, yol):
        self.adi = yol
        self.stat = os.stat(self.adi)       
        self.dizin = yol[:yol.rfind(SLASH)]
        self.hash_degeri = self.hash_bul()

    def hash_bul(self, blksize=65536):
        hasher = hashlib.sha256()
        with open(self.adi, "rb") as infile:
            buf = infile.read(blksize)
            while len(buf) > 0:
                hasher.update(buf)
                buf = infile.read(blksize)
        return hasher.hexdigest()
        
if __name__ == "__main__":
    import sys
    fname = sys.argv[1]
    d = Dosya(fname)
    print("Sha256 degeri :", d.hash_degeri,"  Boyutu :", d.stat.st_size)