diff --git a/scrapy/extensions/feedexport.py b/scrapy/extensions/feedexport.py
index e27e6f915..36107a62b 100644
--- a/scrapy/extensions/feedexport.py
+++ b/scrapy/extensions/feedexport.py
@@ -21,8 +21,7 @@ from zope.interface import Interface, implementer
 from scrapy import Spider, signals
 from scrapy.exceptions import NotConfigured, ScrapyDeprecationWarning
 from scrapy.extensions.postprocessing import PostProcessingManager
-from scrapy.utils.boto import is_botocore_available
-from scrapy.utils.boto import is_boto3_available
+from scrapy.utils.boto import is_boto3_available, is_botocore_available
 from scrapy.utils.conf import feed_complete_default_values_from_settings
 from scrapy.utils.ftp import ftp_store_file
 from scrapy.utils.log import failure_to_exc_info
@@ -178,6 +177,7 @@ class S3FeedStorage(BlockingFeedStorage):
 
         if self._using_boto3:
             import boto3.session
+
             session = boto3.session.Session()
 
             self.s3_client = session.client(
@@ -195,6 +195,7 @@ class S3FeedStorage(BlockingFeedStorage):
             )
 
             import botocore.session
+
             session = botocore.get_session()
 
             self.s3_client = session.create_client(