Recursively convert mongoengine object to a python object

flattenmongoengine.py

from bson.objectid import ObjectId
from datetime import datetime
from decimal import Decimal
from mongoengine.base.datastructures import EmbeddedDocumentList


def _checkTypes (ref) :
    allowed_list = [str, ObjectId, datetime, int, float, Decimal]
    if ref is None :
        return True

    for i in allowed_list :
        if isinstance(ref, i) :
            return True
    
    return False

def flattenMongoDoc(doc, resultList = None):
    
    result = {}
    if isinstance(doc, EmbeddedDocumentList) :
        if resultList == None :
            resultList = []
        for i in doc :
            resultList.append(flattenMongoDoc(i, resultList))
        return resultList

    for i in doc : 
        
        if not isinstance(i,str ):
            return ""
        v = getattr(doc,i)
        #typeof = type(v)
        #print(typeof)
        if _checkTypes(v) :
            result[i] = v
        else :
            #print("Recursing "+ str(typeof))
            result[i] = flattenMongoDoc(v)
    
    return result