diff --git a/coverage/files.py b/coverage/files.py
index ec1aaf56f..5cad254ee 100644
--- a/coverage/files.py
+++ b/coverage/files.py
@@ -406,7 +406,7 @@ def find_python_files(dirname, include_namespace_packages):
 
     """
     for i, (dirpath, dirnames, filenames) in enumerate(os.walk(dirname)):
-        if (i > 0 and '__init__.py' not in filenames 
+        if (i > 0 and '__init__.py' not in filenames
             and not include_namespace_packages):
             # If a directory doesn't have __init__.py, then it isn't
             # importable and neither are its files
diff --git a/coverage/inorout.py b/coverage/inorout.py
index ad7722578..780935282 100644
--- a/coverage/inorout.py
+++ b/coverage/inorout.py
@@ -567,7 +567,7 @@ def _find_executable_files(self, src_dir):
 
         """
         py_files = (
-            (py_file, None) for py_file in 
+            (py_file, None) for py_file in
             find_python_files(src_dir, self.include_namespace_packages)
         )
         plugin_files = self._find_plugin_files(src_dir)
diff --git a/tests/test_cmdline.py b/tests/test_cmdline.py
index e52fec7ff..624ae972f 100644
--- a/tests/test_cmdline.py
+++ b/tests/test_cmdline.py
@@ -61,8 +61,8 @@ class BaseCmdLineTest(CoverageTest):
     _defaults.Coverage(
         data_file=DEFAULT_DATAFILE,
         cover_pylib=None, data_suffix=None, timid=None, branch=None,
-        config_file=True, source=None, include=None, include_namespace_packages=False, 
-        omit=None, debug=None, concurrency=None, check_preimported=True, context=None, 
+        config_file=True, source=None, include=None, include_namespace_packages=False,
+        omit=None, debug=None, concurrency=None, check_preimported=True, context=None,
         messages=True,
     )
 
diff --git a/tests/test_files.py b/tests/test_files.py
index b217389de..8ea6daf02 100644
--- a/tests/test_files.py
+++ b/tests/test_files.py
@@ -427,7 +427,7 @@ def test_find_python_files_include_namespace_packages(self):
         self.make_file("sub/ssub/__init__.py")
         self.make_file("sub/ssub/s.py")
         self.make_file("sub/ssub/~s.py")            # nope: editor effluvia
-        self.make_file("sub/lab/exp.py")            
+        self.make_file("sub/lab/exp.py")
         self.make_file("sub/windows.pyw")
         py_files = set(find_python_files("sub", True))
         self.assert_same_files(py_files, [