"errorMessage": "Handler 'lambda_handler' missing on module 'lambda

I created a simple code in AWS Lambda for listing my buckets

import boto3
import botocore

s3 = boto3.client('s3')
response = s3.list_buckets()
print('Existing buckets:')
for bucket in response['Buckets']:
    print(f'  {bucket["Name"]}')

When I Deploy and test it, it gives me the right logs (my list of buckets) but it also gives me the error

Handler 'lambda_handler' missing on module 'lambda_function'

Do i have to write lambda_function(event,context) for everything?

CodePudding user response：

Yes, you need it. It should be

import boto3
import botocore

def lambda_handler(event,context):
    s3 = boto3.client('s3')
    response = s3.list_buckets()
    print('Existing buckets:')
    for bucket in response['Buckets']:
        print(f'  {bucket["Name"]}')

because AWS needs to know / have a function to invoke and pass its event and context parameters.