Identifying sqlalchemy.exc.OperationalError

After some more research, I found the mysql error code to be in err.orig.args[0]. So the Answer is:

try:
  engine.scalar(select([1]))
except sqlalchemy.exc.OperationalError as err:
  if err.orig.args[0]==1045:
    print("Access Denied")
  elif err.orig.args[0]==2003:
    print("Connection Refused")
  else:
    raise