import boto3
import zlib
s3 = boto3.session.Session().client('s3')
resp = s3.get_object( Bucket='BUCKET', Key='PATH' )
b = resp['Body']
i = 0
cnt = 0
c = 0
dec = zlib.decompressobj(zlib.MAX_WBITS|32)
for l in b.iter_chunks( chunk_size=1024 * 32 ):
    c = dec.decompress( l ).decode().count( '\n' )
    i+=1
    cnt+=c

print( str( i ) + " : " + str( cnt ) )