diff --git a/tiramisu/config.py b/tiramisu/config.py
index 5c66e24..1264077 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -67,7 +67,7 @@ class Config(object):
         self._cfgimpl_toplevel = self._cfgimpl_get_toplevel()
         # some api members shall not be used as option's names !
         methods = getmembers(self, ismethod)
-        self._cfgimpl_slots = [key for key, value in methods \
+        self._cfgimpl_slots = [key for key, value in methods
                               if not key.startswith("_")]
         self._cfgimpl_build()
 
@@ -325,6 +325,7 @@ class Config(object):
     def get_warnings(self):
         "Config implements its own warning pile"
         return self._cfgimpl_get_toplevel()._cfgimpl_warnings
+
     # ____________________________________________________________
     def getkey(self):
         return self._cfgimpl_descr.getkey(self)
@@ -341,6 +342,7 @@ class Config(object):
     def __ne__(self, other):
         "Config comparison"
         return not self == other
+
     # ______________________________________________________________________
     def __iter__(self):
         """Pythonesque way of parsing group's ordered options.
@@ -350,7 +352,7 @@ class Config(object):
                 try:
                     yield child._name, getattr(self, child._name)
                 except:
-                    pass # option with properties
+                    pass  # option with properties
 
     def iter_groups(self, group_type=None):
         """iteration on groups objects only.
@@ -409,9 +411,9 @@ class Config(object):
                     paths.append(path)
             except PropertiesOptionError:
                 if allpaths:
-                    paths.append(path) # option which have properties added
+                    paths.append(path)  # option which have properties added
             else:
-                 paths.append(path)
+                paths.append(path)
         return paths
 
     def _find(self, bytype, byname, byvalue, byattrs, first):