diff --git a/setupbase.py b/setupbase.py
index e6330ea..ac2acc0 100644
--- a/setupbase.py
+++ b/setupbase.py
@@ -95,9 +95,9 @@ def find_packages():
     """
     excludes = ['deathrow', 'quarantine']
     packages = []
-    for directory, subdirs,files in os.walk('IPython'):
-        package = directory.replace(os.path.sep, '.')
-        if any(package.startswith('IPython.'+exc) for exc in excludes):
+    for directory, subdirs, files in os.walk("IPython"):
+        package = directory.replace(os.path.sep, ".")
+        if any(package.startswith("IPython." + exc) for exc in excludes):
             # package is to be excluded (e.g. deathrow)
             continue
         if '__init__.py' not in files: