How do I read a csv file from aws s3 in aws lambda

Question

I am new to the AWS services.I am trying to read a csv file from AWS S3 bucket but I cannot read or get any output from AWS lambda.

import json
import boto3
import csv
s3_client = boto3.client('s3')
def lambda_handler(event, context):
    # TODO implement
    try:
        bucket_name = event["Records"][0]["s3"]["bucket"]["name"]
        s3_file_name = event["Records"][0]["s3"]["object"]["key"]
    
        csv_file = s3_client.get_object(Bucket=bucket_name, Key=s3_file_name)
        data = csv_file['Body'].read().splitlines(True)
        reader = csv.reader(data)
        print(reader)
    except Exception as err:
        print(err)
    

    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
}

I am getting this output but I don’t get data from my print line why is that?
please help me!

here is s3req test event

Asked By: Adeesha_Anjana

||

Source

Answer 1

https://docs.python.org/3/library/csv.html

According to the documents, I think you used the wrong way of csv module. So the reader is empty and that’s why your code does not return anything

Answered By: Chuong Nguyen

Answer 2

An easy way to read csv is by using pandas.

import boto3
import pandas as pd

s3 = boto3.client('s3')
response = s3.get_object(Bucket=bucket, Key=path)
content = pd.read_csv(response.get("Body"))

Answered By: Jimson James

How do I read a csv file from aws s3 in aws lambda

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