diff --git a/lofar_station_client/common/_case_insensitive_dict.py b/lofar_station_client/common/_case_insensitive_dict.py
index ee19def49cd115fb09b95db2cbbb57873ae7beba..65f514cb31ac64e93cec7c3dccb7bd65d1fa255e 100644
--- a/lofar_station_client/common/_case_insensitive_dict.py
+++ b/lofar_station_client/common/_case_insensitive_dict.py
@@ -51,7 +51,8 @@ class ReversibleIterator:
 
 
 class AbstractReversibleView(abc.ABC):
-    """ An abstract reversible view """
+    """An abstract reversible view"""
+
     def __init__(self, data: UserDict):
         self.data = data
         self.len = len(data)
@@ -69,7 +70,7 @@ class AbstractReversibleView(abc.ABC):
 
 
 class ReversibleItemsView(AbstractReversibleView):
-    """ Reversible view on items """
+    """Reversible view on items"""
 
     def __iter__(self):
         return ReversibleIterator(
@@ -83,7 +84,7 @@ class ReversibleItemsView(AbstractReversibleView):
 
 
 class ReversibleKeysView(AbstractReversibleView):
-    """ Reversible view on keys """
+    """Reversible view on keys"""
 
     def __iter__(self):
         return ReversibleIterator(
@@ -97,7 +98,7 @@ class ReversibleKeysView(AbstractReversibleView):
 
 
 class ReversibleValuesView(AbstractReversibleView):
-    """ Reversible view on values """
+    """Reversible view on values"""
 
     def __iter__(self):
         return ReversibleIterator(list(self.data.data.values()), 0, self.len, 1)