diff --git a/tqdm/contrib/itertools.py b/tqdm/contrib/itertools.py
index 728a550d..42bbf5bf 100644
--- a/tqdm/contrib/itertools.py
+++ b/tqdm/contrib/itertools.py
@@ -1,3 +1,6 @@
+"""
+Thin wrappers around `itertools`.
+"""
 from __future__ import absolute_import
 from tqdm.auto import tqdm as tqdm_auto
 from copy import deepcopy
diff --git a/tqdm/tests/tests_concurrent.py b/tqdm/tests/tests_concurrent.py
index 57412cae..c91ab0a0 100644
--- a/tqdm/tests/tests_concurrent.py
+++ b/tqdm/tests/tests_concurrent.py
@@ -1,7 +1,6 @@
 """
 Tests for `tqdm.contrib`
 """
-import sys
 from tqdm.contrib.concurrent import thread_map, process_map
 from tests_tqdm import with_setup, pretest, posttest, SkipTest, StringIO, \
     closing
@@ -11,6 +10,7 @@ def incr(x):
     """Dummy function"""
     return x + 1
 
+
 @with_setup(pretest, posttest)
 def test_thread_map():
     """Test contrib.concurrent.thread_map"""