Hashing error + salt password

Help me solve this problem:

TypeError: can't concat bytes to str

      

        
        
        
      

    

I am trying to store hash + salt passwords securely.
I think the problem is that my salt is a byte object.

How do I convert it to a string? Or is there a better way to hash it?

import base64
import hashlib
import os

def getDigest(password, salt=None):
    if not salt:
        salt = base64.b64encode(os.urandom(32))
        digest = hashlib.sha256(salt + password).hexdigest()
        return salt, digest

def isPassword(password, salt, digest):
    return getDigest(password, salt)[1] == digest  


print(getDigest('batman'))