How to read csv file from s3 bucket in AWS Lambda?

Question

I am trying to read the content of a csv file which was uploaded on an s3 bucket. To do so, I get the bucket name and the file key from the event that triggered the lambda function and read it line by line. Here is my code:

import json
import os
import boto3
import csv

def lambda_handler(event,  context):
    for record in event['Records']:
        bucket = record['s3']['bucket']['name']
        file_key = record['s3']['object']['key']
        s3 = boto3.client('s3')
        csvfile = s3.get_object(Bucket=bucket, Key=file_key)
        csvcontent = csvfile['Body'].read().split(b'\n')
        data = []
        with open(csvfile['Body'], 'r') as csv_file:
          csv_file = csv.DictReader(csv_file)
          data = list(csv_file)

The exact error I’m getting on the CloudWatch is:

[ERROR] TypeError: expected str, bytes or os.PathLike object, not list
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 19, in lambda_handler
    with open(csvcontent, 'r') as csv_file:

Could someone help me fix this? I appreciate any help you can provide as I am new to lambda

Answer 1

To get the CSV file data from s3 bucket in the proper and with easy to retrieve index format below code helped me a lot:

key = 'key-name'
bucket = 'bucket-name'
s3_resource = boto3.resource('s3')
s3_object = s3_resource.Object(bucket, key)

data = s3_object.get()['Body'].read().decode('utf-8').splitlines()

lines = csv.reader(data)
headers = next(lines)
print('headers: %s' %(headers))
for line in lines:
    #print complete line
    print(line)
    #print index wise
    print(line[0], line[1])