def iterate_file(bucket, key, encoding="utf-8"):
obj = s3_resource().Object(bucket, key).get()["Body"]
if key.endswith(".gz"):
obj = GzipFile(None, "rb", fileobj=obj)
for line in obj:
yield line.decode(encoding).strip()
else:
for line in obj.iter_lines():
yield line.decode(encoding).strip()
