check symfony2 password with python

check symfony2 password with python.py

import hashlib,base64

def checkPass(password,salt):
  salted=(password+'{'+salt+'}').encode('utf-8')
  if not salt:
    salted=password.encode('utf-8')
  m=hashlib.sha512()
  m.update(salted)
  digest=m.digest()

  for i in range(4999):
     m=hashlib.sha512()
     m.update(digest+salted)
     digest=m.digest()
  return base64.b64encode(digest).decode('utf-8')
  
print (checkPass('password123','salt1223'))