python在AWS lamda中运行的“ XXXX未定义”错误

Question

我有一个简单的脚本来更新DynamoDB中的值，然后还给我回馈更新的值。如果我在vscode中运行脚本，与AWS交谈，则可以正常工作 - 没有错误。但是，当我为lambda格式化时，我会遇到错误。

vscode

import boto3
from boto3.dynamodb.conditions import Key, Attr

dynamodb = boto3.resource('dynamodb',region_name='us-east-1')
table = dynamodb.Table('Visitors')

response = table.update_item(
    Key={'ID': 0},
    UpdateExpression="ADD #ct :increment",
    ExpressionAttributeNames={'#ct': 'visitorcount'},
    ExpressionAttributeValues={':increment': 1},

    ReturnValues = "UPDATED_NEW"
    
)
visitorCount = int(response["Attributes"]["visitorcount"])
print('visitorCount obtained from table = ' + str(visitorCount))

lambda

import json
import boto3
from boto3.dynamodb.conditions import Key, Attr

dynamodb = boto3.resource('dynamodb',region_name='us-east-1')
table = dynamodb.Table('Visitors')

def lambda_handler(event, context):
    dbresponse = table.update_item(
        Key={'ID': 0},
        UpdateExpression="ADD #ct :increment",
        ExpressionAttributeNames={'#ct': 'visitorcount'},
        ExpressionAttributeValues={':increment': 1},

    ReturnValues = "UPDATED_NEW"
    )
    
visitorCount = int(dbresponse["Attributes"]["visitorcount"])
print('visitorCount obtained from table = ' + str(visitorCount))

测试时lambda错误

测试事件名称 MyCodetest

Response
{
  *"errorMessage": "name 'dbresponse' is not defined",
  "errorType": "NameError",*
  "requestId": "",
  "stackTrace": [
    "  File \"/var/lang/lib/python3.9/importlib/__init__.py\", line 127, in import_module\n    return _bootstrap._gcd_import(name[level:], package, level)\n",
    "  File \"<frozen importlib._bootstrap>\", line 1030, in _gcd_import\n",
    "  File \"<frozen importlib._bootstrap>\", line 1007, in _find_and_load\n",
    "  File \"<frozen importlib._bootstrap>\", line 986, in _find_and_load_unlocked\n",
    "  File \"<frozen importlib._bootstrap>\", line 680, in _load_unlocked\n",
    "  File \"<frozen importlib._bootstrap_external>\", line 850, in exec_module\n",
    "  File \"<frozen importlib._bootstrap>\", line 228, in _call_with_frames_removed\n",
    "  *File \"/var/task/lambda_function.py\", line 18, in <module>\n    visitorCount = int(dbresponse[\"Attributes\"][\"visitorcount\"])\n"*

我谷歌搜索了无济于事，任何帮助将不胜感激。我敢肯定，这是很小的，但不是程序员，发现这个障碍很难克服。