Read a file line by line from S3 using boto?

Question

I have a csv file in S3 and I\'m trying to read the header line to get the size (these files are created by our users so they could be almost any size). Is there a way to do

Answer 1

Here's a solution which actually streams the data line by line:

from io import TextIOWrapper
from gzip import GzipFile
...

# get StreamingBody from botocore.response
response = s3.get_object(Bucket=bucket, Key=key)
# if gzipped
gzipped = GzipFile(None, 'rb', fileobj=response['Body'])
data = TextIOWrapper(gzipped)

for line in data:
    # process line