Python (boto3)에서 DynamoDB의 데이터를 업데이트하려고하면 "ExpressionAttributeNames contains invalid key: Syntax error; key: <keyname>"

사건

from datetime import datetime
import boto3

dynamodb = boto3.resource('dynamodb')

now_unix_time = datetime.now().strftime('%s')
clientId = 'ef5b728f4a74aed'
option = {
    'Key': {'client-id': clientId},
    'UpdateExpression': 'set #device-time-stamp = :timeStamp',
    'ExpressionAttributeNames': {
        '#device-time-stamp': 'device-time-stamp'
    },
    'ExpressionAttributeValues': {
        ':timeStamp': now_unix_time
    }
}

table = dynamodb.Table('client_id_master')
table.update_item(**option)

An error occurred (ValidationException) when calling the UpdateItem operation: ExpressionAttributeNames contains invalid key: Syntax error; key: \"#device-time-stamp\""

원인 · 해결

from datetime import datetime
import boto3

dynamodb = boto3.resource('dynamodb')

now_unix_time = datetime.now().strftime('%s')
clientId = 'ef5b728f4a74aed'
option = {
    'Key': {'client-id': clientId},
    'UpdateExpression': 'set #device_time_stamp = :timeStamp',
    'ExpressionAttributeNames': {
        '#device_time_stamp': 'device-time-stamp'
    },
    'ExpressionAttributeValues': {
        ':timeStamp': now_unix_time
    }
}

table = dynamodb.Table('client_id_master')
table.update_item(**option)