Python AWS Boto3: How do i read files from S3 Bucket?

Question

Using Boto3, the python script downloads files from an S3 bucket to read them and write the contents of the downloaded files to a file called blank_file.txt.

What my question is, how would it work the same way once the script gets on an AWS Lambda function?

Answer 1

In an AWS Lambda function you get a 512 MB of of space in the /tmp folder. This is what you can use to download S3 files or create a new one. And you can use the code mentioned below to do it:

s3client.download_file(bucket_name, obj.key, '/tmp/'+filename) 

... 

my_file = open('/tmp/blank_file.txt', 'w')

In case you are not comfortable with file handling and other python concepts you can take a look at this video: