diff --git a/IPython/utils/tests/test_openpy.py b/IPython/utils/tests/test_openpy.py
index 183d262..9e66d43 100644
--- a/IPython/utils/tests/test_openpy.py
+++ b/IPython/utils/tests/test_openpy.py
@@ -5,28 +5,35 @@ import nose.tools as nt
 from IPython.utils import openpy
 
 mydir = os.path.dirname(__file__)
-nonascii_path = os.path.join(mydir, '../../core/tests/nonascii.py')
+nonascii_path = os.path.join(mydir, "../../core/tests/nonascii.py")
+
 
 def test_detect_encoding():
-    with open(nonascii_path, 'rb') as f:
+    with open(nonascii_path, "rb") as f:
         enc, lines = openpy.detect_encoding(f.readline)
-    nt.assert_equal(enc, 'iso-8859-5')
+    nt.assert_equal(enc, "iso-8859-5")
+
 
 def test_read_file():
-    with io.open(nonascii_path, encoding='iso-8859-5') as f:
+    with io.open(nonascii_path, encoding="iso-8859-5") as f:
         read_specified_enc = f.read()
     read_detected_enc = openpy.read_py_file(nonascii_path, skip_encoding_cookie=False)
     nt.assert_equal(read_detected_enc, read_specified_enc)
-    assert 'coding: iso-8859-5' in read_detected_enc
-    
-    read_strip_enc_cookie = openpy.read_py_file(nonascii_path, skip_encoding_cookie=True)
-    assert 'coding: iso-8859-5' not in read_strip_enc_cookie
+    assert "coding: iso-8859-5" in read_detected_enc
+
+    read_strip_enc_cookie = openpy.read_py_file(
+        nonascii_path, skip_encoding_cookie=True
+    )
+    assert "coding: iso-8859-5" not in read_strip_enc_cookie
+
 
 def test_source_to_unicode():
-    with io.open(nonascii_path, 'rb') as f:
+    with io.open(nonascii_path, "rb") as f:
         source_bytes = f.read()
-    nt.assert_equal(openpy.source_to_unicode(source_bytes, skip_encoding_cookie=False).splitlines(),
-                    source_bytes.decode('iso-8859-5').splitlines())
+    nt.assert_equal(
+        openpy.source_to_unicode(source_bytes, skip_encoding_cookie=False).splitlines(),
+        source_bytes.decode("iso-8859-5").splitlines(),
+    )
 
     source_no_cookie = openpy.source_to_unicode(source_bytes, skip_encoding_cookie=True)
-    nt.assert_not_in('coding: iso-8859-5', source_no_cookie)
+    nt.assert_not_in("coding: iso-8859-5", source_no_cookie)