lambdaの中でcomprehend apiを呼び出す

detect_sentiment.py

import json
import boto3


# Comprehend constant
REGION = 'us-west-2'


# Function for detecting sentiment
def detect_sentiment(text, language_code):
    comprehend = boto3.client('comprehend', region_name=REGION)
    response = comprehend.detect_sentiment(Text=text, LanguageCode=language_code)
    return response
    

def lambda_handler(event, context):
    # TODO implement
    print(json.dumps(event))
    
    # 
    # 'data' expects a object has 3 key:
    #   - LanguageCode, Score, Text
    # 
    data = json.loads(event['Input']['Payload'])
    print(data)
    
    # detecting sentiment
    result = detect_sentiment(data['Text'], data['LanguageCode'])
    print("Starting detecting sentiment")
    print(json.dumps(result, sort_keys=True))
    print("End of detecting sentiment\n")
    
    return json.dumps({
        'event': result
    })

参考
https://dev.classmethod.jp/cloud/comprehend-operations-using-python-boto3-ja/