python - How to write JSON data to Dynamodb by ignoring empty elements in boto3 -


i write following data group dynamodb.
there 100 data. since images not required, there mixture , without image_url element.

(questionslist.json)

{   "q_id" : "001",   "q_body" : "where capital of united states?",   "q_answer" : "washington, d.c.",   "image_url" : "/washington.jpg",   "keywords" : [     "unitedstates",     "washington"   ] }, {   "q_id" : "002",   "q_body" : "where capital city of uk?",   "q_answer" : "london",   "image_url" : "",   "keywords" : [     "uk",     "london"   ] },

since writing test phase, dynamodb write prepared in localhost:8000 using serverless-dynamodb-local plugin of serverless framework, not production environment.
in order write above json data dynamodb, wrote following code in boto 3 (aws sdk python).

from __future__ import print_function import boto3 import codecs import json  dynamodb = boto3.resource('dynamodb', region_name='us-east-1', endpoint_url="http://localhost:8000")  table = dynamodb.table('questionlisttable')  open("questionlist.json", "r", encoding='utf-8') json_file: items = json.load(json_file) item in items:     q_id = item['q_id']     q_body = item['q_body']     q_answer = item['q_answer']     image_url = item['image_url']     keywords = item['keywords']      print("adding detail:", q_id, q_body)      table.put_item(         item={             'q_id': q_id,             'q_body': q_body,             'q_answer': q_answer,             'image_url': image_url,             'keywords': keywords,         }     )

when code executed, following error occurs in null character part.

botocore.exceptions.clienterror: error occurred (validationexception) when calling putitem operation: 1 or more parameter values invalid: attributevalue may not contain empty string

apparently seems caused json 's null character.
if exclude image_url containing null character target of writing below, writing completed without problem.

from __future__ import print_function import boto3 import codecs import json  dynamodb = boto3.resource('dynamodb', region_name='us-east-1', endpoint_url="http://localhost:8000")  table = dynamodb.table('questionlisttable')  open("questionlist.json", "r", encoding='utf-8') json_file: items = json.load(json_file) item in items:     q_id = item['q_id']     q_body = item['q_body']     q_answer = item['q_answer']     #image_url = item['image_url']     keywords = item['keywords']      print("adding detail:", q_id, q_body)      table.put_item(         item={             'q_id': q_id,             'q_body': q_body,             'q_answer': q_answer,             #'image_url': image_url,             'keywords': keywords,         }     )

since dynamodb nosql, there may other methods make use of characteristics, how correct code write above data ignoring empty characters? "if image_url exists, write if not, ignore it."

thank you.

i solved problem. can set null follows.

from __future__ import print_function import boto3 import codecs import json  dynamodb = boto3.resource('dynamodb', region_name='ap-northeast-1', endpoint_url="http://localhost:8000")  table = dynamodb.table('questionlisttable')  open("questionlist.json", "r", encoding='utf-8_sig') json_file:     items = json.load(json_file)     item in items:     q_id = item['q_id']     q_body = item['q_body']     q_answer = item['q_answer']     image_url = item['image_url'] if item['image_url'] else none     keywords = item['keywords'] if item['keywords'] else none      print("adding detail:", q_id, q_body)      table.put_item(         item={             'q_id': q_id,             'q_body': q_body,             'q_answer': q_answer,             'image_url': image_url,             'keywords': keywords,         }     )

in order check situation of dynamodb, use offline plugin of serverless framework run api gateway in local environment. when called api using postman, null inserted in value.

{   "q_id" : "001",   "q_body" : "where capital of united states?",   "q_answer" : "washington, d.c.",   "image_url" : "/washington.jpg",   "keywords" : [     "unitedstates",     "washington"   ] }, {   "q_id" : "002",   "q_body" : "where capital city of uk?",   "q_answer" : "london",   "image_url" : "null",   "keywords" : [     "uk",     "london"   ] },

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