diff --git a/masque/builder/renderpather.py b/masque/builder/renderpather.py
index 11759a5..8dae18b 100644
--- a/masque/builder/renderpather.py
+++ b/masque/builder/renderpather.py
@@ -248,7 +248,7 @@ class RenderPather(PortList):
             other_tgt = self.library[other.name]
 
         # get rid of plugged ports
-        for kk in map_in.keys():
+        for kk in map_in:
             if kk in self.paths:
                 self.paths[kk].append(RenderStep('P', None, self.ports[kk].copy(), self.ports[kk].copy(), None))
 
diff --git a/masque/library.py b/masque/library.py
index d5b3136..ce5adb2 100644
--- a/masque/library.py
+++ b/masque/library.py
@@ -176,7 +176,7 @@ class ILibraryView(Mapping[str, 'Pattern'], metaclass=ABCMeta):
             tops = tuple(self.keys())
 
         if skip is None:
-            skip = set([None])
+            skip = {None}
 
         if isinstance(tops, str):
             tops = (tops,)
@@ -213,7 +213,7 @@ class ILibraryView(Mapping[str, 'Pattern'], metaclass=ABCMeta):
         if isinstance(tops, str):
             tops = (tops,)
 
-        keep = cast(set[str], self.referenced_patterns(tops) - set((None,)))
+        keep = cast(set[str], self.referenced_patterns(tops) - {None})
         keep |= set(tops)
 
         filtered = {kk: vv for kk, vv in self.items() if kk in keep}
@@ -665,7 +665,7 @@ class ILibrary(ILibraryView, MutableMapping[str, 'Pattern'], metaclass=ABCMeta):
         duplicates = set(self.keys()) & set(other.keys())
 
         if not duplicates:
-            for key in other.keys():
+            for key in other:
                 self._merge(key, other, key)
             return {}
 
@@ -912,7 +912,7 @@ class ILibrary(ILibraryView, MutableMapping[str, 'Pattern'], metaclass=ABCMeta):
         if isinstance(tops, str):
             tops = (tops,)
 
-        keep = cast(set[str], self.referenced_patterns(tops) - set((None,)))
+        keep = cast(set[str], self.referenced_patterns(tops) - {None})
         keep |= set(tops)
 
         new = type(self)()
@@ -934,7 +934,7 @@ class ILibrary(ILibraryView, MutableMapping[str, 'Pattern'], metaclass=ABCMeta):
             A set containing the names of all deleted patterns
         """
         trimmed = set()
-        while empty := set(name for name, pat in self.items() if pat.is_empty()):
+        while empty := {name for name, pat in self.items() if pat.is_empty()}:
             for name in empty:
                 del self[name]
 
diff --git a/masque/pattern.py b/masque/pattern.py
index 0c3b6cb..74e5e0f 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -472,10 +472,10 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
 
         self.polygonize()
         for layer in self.shapes:
-            self.shapes[layer] = list(chain.from_iterable((
+            self.shapes[layer] = list(chain.from_iterable(
                 ss.manhattanize(grid_x, grid_y)
                 for ss in self.shapes[layer]
-                )))
+                ))
         return self
 
     def as_polygons(self, library: Mapping[str, 'Pattern']) -> list[NDArray[numpy.float64]]:
diff --git a/masque/ports.py b/masque/ports.py
index 8f6a817..6f029b1 100644
--- a/masque/ports.py
+++ b/masque/ports.py
@@ -239,7 +239,7 @@ class PortList(metaclass=ABCMeta):
             if duplicates:
                 raise PortError(f'Unrenamed ports would be overwritten: {duplicates}')
 
-        renamed = {mapping[k]: self.ports.pop(k) for k in mapping.keys()}
+        renamed = {vv: self.ports.pop(kk) for kk, vv in mapping.items()}
         if None in renamed:
             del renamed[None]
 
diff --git a/masque/utils/autoslots.py b/masque/utils/autoslots.py
index 4b1d001..8b60897 100644
--- a/masque/utils/autoslots.py
+++ b/masque/utils/autoslots.py
@@ -17,11 +17,11 @@ class AutoSlots(ABCMeta):
         for base in bases:
             parents |= set(base.mro())
 
-        slots = tuple(dctn.get('__slots__', tuple()))
+        slots = tuple(dctn.get('__slots__', ()))
         for parent in parents:
             if not hasattr(parent, '__annotations__'):
                 continue
-            slots += tuple(getattr(parent, '__annotations__').keys())
+            slots += tuple(parent.__annotations__.keys())
 
         dctn['__slots__'] = slots
         return super().__new__(cls, name, bases, dctn)
diff --git a/masque/utils/ports2data.py b/masque/utils/ports2data.py
index 1092b7a..b67fa0a 100644
--- a/masque/utils/ports2data.py
+++ b/masque/utils/ports2data.py
@@ -150,7 +150,7 @@ def data_to_ports_flat(
     Returns:
         The updated `pattern`. Port labels are not removed.
     """
-    labels = list(chain.from_iterable((pattern.labels[layer] for layer in layers)))
+    labels = list(chain.from_iterable(pattern.labels[layer] for layer in layers))
     if not labels:
         return pattern