diff --git a/src/python_minifier/__main__.py b/src/python_minifier/__main__.py
index ec7c2ab7..18a4e5cd 100644
--- a/src/python_minifier/__main__.py
+++ b/src/python_minifier/__main__.py
@@ -7,6 +7,7 @@
 from python_minifier import minify
 from python_minifier.transforms.remove_annotations_options import RemoveAnnotationsOptions
 
+
 if sys.version_info >= (3, 8):
     from importlib import metadata
 
@@ -270,9 +271,9 @@ def error(os_error):
 
     for path_arg in args.path:
         if os.path.isdir(path_arg):
-            for root, dirs, files in os.walk(path_arg, onerror=error, followlinks=True):
+            for root, _dirs, files in os.walk(path_arg, onerror=error, followlinks=True):
                 for file in files:
-                    if file.endswith('.py') or file.endswith('.pyw'):
+                    if file.endswith(('.py', '.pyw')):
                         yield os.path.join(root, file)
         else:
             yield path_arg
diff --git a/src/python_minifier/ast_compat.py b/src/python_minifier/ast_compat.py
index da7f5a11..b52a167b 100644
--- a/src/python_minifier/ast_compat.py
+++ b/src/python_minifier/ast_compat.py
@@ -8,6 +8,7 @@
 
 from ast import *
 
+
 # Ideally we don't import anything else
 
 if 'TypeAlias' in globals():
diff --git a/src/python_minifier/ast_printer.py b/src/python_minifier/ast_printer.py
index 1b9c020e..c8f588b1 100644
--- a/src/python_minifier/ast_printer.py
+++ b/src/python_minifier/ast_printer.py
@@ -14,6 +14,7 @@
 
 from python_minifier.util import is_ast_node
 
+
 INDENT = '    '
 
 # The field name that can be omitted for each node
diff --git a/src/python_minifier/expression_printer.py b/src/python_minifier/expression_printer.py
index d9cd685b..c4a0202a 100644
--- a/src/python_minifier/expression_printer.py
+++ b/src/python_minifier/expression_printer.py
@@ -629,7 +629,8 @@ def visit_arguments(self, node):
     def visit_arg(self, node):
         if isinstance(node, ast.Name):
             # Python 2 uses Name nodes
-            return self.visit_Name(node)
+            self.visit_Name(node)
+            return
 
         self.printer.identifier(node.arg)
 
diff --git a/src/python_minifier/f_string.py b/src/python_minifier/f_string.py
index ae505d73..91a50330 100644
--- a/src/python_minifier/f_string.py
+++ b/src/python_minifier/f_string.py
@@ -36,7 +36,7 @@ def is_correct_ast(self, code):
             c = ast.parse(code, 'FString candidate', mode='eval')
             compare_ast(self.node, c.body)
             return True
-        except Exception as e:
+        except Exception:
             return False
 
     def complete_debug_specifier(self, partial_specifier_candidates, value_node):
@@ -79,12 +79,12 @@ def candidates(self):
                             # Maybe!
                             try:
                                 debug_specifier_candidates = [x + '{' + v.s for x in candidates]
-                            except Exception as e:
+                            except Exception:
                                 continue
 
                     try:
                         candidates = [x + self.str_for(v.s, quote) for x in candidates]
-                    except Exception as e:
+                    except Exception:
                         continue
                 elif isinstance(v, ast.FormattedValue):
                     try:
@@ -93,15 +93,14 @@ def candidates(self):
                             x + y for x in candidates for y in FormattedValue(v, nested_allowed, self.pep701).get_candidates()
                         ] + completed
                         debug_specifier_candidates = []
-                    except Exception as e:
+                    except Exception:
                         continue
                 else:
                     raise RuntimeError('Unexpected JoinedStr value')
 
                 actual_candidates += ['f' + quote + x + quote for x in candidates]
 
-        actual_candidates = filter(self.is_correct_ast, actual_candidates)
-        return actual_candidates
+        return filter(self.is_correct_ast, actual_candidates)
 
     def str_for(self, s, quote):
         return s.replace('{', '{{').replace('}', '}}')
diff --git a/src/python_minifier/ministring.py b/src/python_minifier/ministring.py
index 8aef9472..5cf517ea 100644
--- a/src/python_minifier/ministring.py
+++ b/src/python_minifier/ministring.py
@@ -32,7 +32,7 @@ def __str__(self):
 
         try:
             eval(self.quote + s + self.quote)
-        except (UnicodeDecodeError, UnicodeEncodeError) as e:
+        except (UnicodeDecodeError, UnicodeEncodeError):
             if self.safe_mode:
                 raise
 
@@ -63,7 +63,7 @@ def to_short(self):
         }
 
         for c in self._s:
-            if c in escaped.keys():
+            if c in escaped:
                 s += escaped[c]
             else:
                 if self.safe_mode:
@@ -95,7 +95,7 @@ def to_long(self):
         }
 
         for c in self._s:
-            if c in escaped.keys():
+            if c in escaped:
                 s += escaped[c]
             else:
                 if self.safe_mode:
diff --git a/src/python_minifier/module_printer.py b/src/python_minifier/module_printer.py
index 32d2e084..d2804447 100644
--- a/src/python_minifier/module_printer.py
+++ b/src/python_minifier/module_printer.py
@@ -244,7 +244,7 @@ def visit_ImportFrom(self, node):
         assert isinstance(node, ast.ImportFrom)
 
         self.printer.keyword('from')
-        for i in range(node.level):
+        for _i in range(node.level):
             self.printer.delimiter('.')
         if node.module is not None:
             self.printer.identifier(node.module)
diff --git a/src/python_minifier/rename/binding.py b/src/python_minifier/rename/binding.py
index 7dde4095..5a4eb959 100644
--- a/src/python_minifier/rename/binding.py
+++ b/src/python_minifier/rename/binding.py
@@ -273,7 +273,7 @@ def should_rename(self, new_name):
 
         """
 
-        raise NotImplementedError()
+        raise NotImplementedError
 
     def rename(self, new_name):
         """
@@ -283,7 +283,7 @@ def rename(self, new_name):
 
         """
 
-        raise NotImplementedError()
+        raise NotImplementedError
 
 
 class NameBinding(Binding):
diff --git a/src/python_minifier/rename/mapper.py b/src/python_minifier/rename/mapper.py
index 2f921e91..215b60cb 100644
--- a/src/python_minifier/rename/mapper.py
+++ b/src/python_minifier/rename/mapper.py
@@ -161,12 +161,11 @@ def add_parent(node, parent=None, namespace=None):
     if is_ast_node(node, 'Nonlocal'):
         namespace.nonlocal_names.update(node.names)
 
-    if isinstance(node, ast.Name):
-        if isinstance(namespace, ast.ClassDef):
-            if isinstance(node.ctx, ast.Load):
-                namespace.nonlocal_names.add(node.id)
-            elif isinstance(node.ctx, ast.Store) and isinstance(node.parent, ast.AugAssign):
-                namespace.nonlocal_names.add(node.id)
+    if isinstance(node, ast.Name) and isinstance(namespace, ast.ClassDef):
+        if isinstance(node.ctx, ast.Load):
+            namespace.nonlocal_names.add(node.id)
+        elif isinstance(node.ctx, ast.Store) and isinstance(node.parent, ast.AugAssign):
+            namespace.nonlocal_names.add(node.id)
 
     for child in ast.iter_child_nodes(node):
         add_parent(child, parent=node, namespace=namespace)
diff --git a/src/python_minifier/rename/rename_literals.py b/src/python_minifier/rename/rename_literals.py
index c5167918..3c67a688 100644
--- a/src/python_minifier/rename/rename_literals.py
+++ b/src/python_minifier/rename/rename_literals.py
@@ -155,18 +155,18 @@ def namespace_path(self, node):
 
         """
 
-        l = []
+        path = []
 
         while True:
             namespace = self.nearest_function_namespace(node)
-            l.insert(0, namespace)
+            path.insert(0, namespace)
 
             if isinstance(namespace, ast.Module):
                 break
 
             node = namespace
 
-        return l
+        return path
 
     def common_path(self, n1_path, n2_path):
 
@@ -217,8 +217,7 @@ def visit_JoinedStr(self, node):
             if is_ast_node(v, ast.Str):
                 # Can't hoist this!
                 continue
-            else:
-                self.visit(v)
+            self.visit(v)
 
     def visit_NameConstant(self, node):
         self.get_binding(node.value, node).add_reference(node)
@@ -242,7 +241,7 @@ def visit_Assign(self, node):
         for target in node.targets:
             if is_ast_node(target, ast.Name) and target.id == '__slots__':
                 # This is a __slots__ assignment, don't hoist the literals
-                return
+                return None
 
         return self.generic_visit(node)
 
diff --git a/src/python_minifier/rename/renamer.py b/src/python_minifier/rename/renamer.py
index 9e9e6b54..2d8aafd9 100644
--- a/src/python_minifier/rename/renamer.py
+++ b/src/python_minifier/rename/renamer.py
@@ -55,7 +55,7 @@ def reservation_scope(namespace, binding):
 
     """
 
-    namespaces = set([namespace])
+    namespaces = {namespace}
 
     for node in binding.references:
         while node is not namespace:
@@ -112,7 +112,7 @@ def available_name(self):
     def __call__(self, module):
         assert isinstance(module, ast.Module)
 
-        for namespace, binding in sorted_bindings(module):
+        for _namespace, binding in sorted_bindings(module):
             if binding.allow_rename:
                 binding.new_name = self.available_name()
 
@@ -154,6 +154,8 @@ def available_name(self, reservation_scope, prefix=''):
             if self.is_available(prefix + name, reservation_scope):
                 return prefix + name
 
+        return None
+
     def is_available(self, name, reservation_scope):
         """
         Is a name unreserved in a reservation scope
@@ -165,11 +167,7 @@ def is_available(self, name, reservation_scope):
 
         """
 
-        for namespace in reservation_scope:
-            if name in namespace.assigned_names:
-                return False
-
-        return True
+        return all(name not in namespace.assigned_names for namespace in reservation_scope)
 
     def __call__(self, module, prefix_globals, reserved_globals=None):
         assert isinstance(module, ast.Module)
@@ -184,6 +182,26 @@ def __call__(self, module, prefix_globals, reserved_globals=None):
             for name in reserved_globals:
                 module.assigned_names.add(name)
 
+        def should_rename(binding, name, scope):
+            if binding.should_rename(name):
+                return True
+
+            # It's no longer efficient to do this rename
+
+            if isinstance(binding, NameBinding):
+                # Check that the original name is still available
+
+                if binding.reserved == binding.name:
+                    # We already reserved it (this is probably an arg)
+                    return False
+
+                if not self.is_available(binding.name, scope):
+                    # The original name has already been assigned to another binding,
+                    # so we need to rename this anyway.
+                    return True
+
+            return False
+
         for namespace, binding in sorted_bindings(module):
             scope = reservation_scope(namespace, binding)
 
@@ -194,27 +212,7 @@ def __call__(self, module, prefix_globals, reserved_globals=None):
                 else:
                     name = self.available_name(scope)
 
-                def should_rename():
-                    if binding.should_rename(name):
-                        return True
-
-                    # It's no longer efficient to do this rename
-
-                    if isinstance(binding, NameBinding):
-                        # Check that the original name is still available
-
-                        if binding.reserved == binding.name:
-                            # We already reserved it (this is probably an arg)
-                            return False
-
-                        if not self.is_available(binding.name, scope):
-                            # The original name has already been assigned to another binding,
-                            # so we need to rename this anyway.
-                            return True
-
-                    return False
-
-                if should_rename():
+                if should_rename(binding, name, scope):
                     binding.rename(name)
                 else:
                     # Any existing name will become reserved
@@ -228,3 +226,5 @@ def should_rename():
 
 def rename(module, prefix_globals=False, preserved_globals=None):
     NameAssigner()(module, prefix_globals, preserved_globals)
+
+
diff --git a/src/python_minifier/transforms/constant_folding.py b/src/python_minifier/transforms/constant_folding.py
index 7d1e1b21..f8d3c7cc 100644
--- a/src/python_minifier/transforms/constant_folding.py
+++ b/src/python_minifier/transforms/constant_folding.py
@@ -70,7 +70,7 @@ def visit_BinOp(self, node):
         try:
             folded_expression = unparse_expression(new_node)
             folded_value = safe_eval(folded_expression)
-        except Exception as e:
+        except Exception:
             # This can happen if the value is too large to be represented as a literal
             # or if the value is unparsed as nan, inf or -inf - which are not valid python literals
             return node
@@ -107,11 +107,11 @@ def equal_value_and_type(a, b):
 
 
 def safe_eval(expression):
-    globals = {}
-    locals = {}
+    empty_globals = {}
+    empty_locals = {}
 
     # This will return the value, or could raise an exception
-    return eval(expression, globals, locals)
+    return eval(expression, empty_globals, empty_locals)
 
 
 def unparse_expression(node):
diff --git a/src/python_minifier/transforms/remove_annotations.py b/src/python_minifier/transforms/remove_annotations.py
index 02804a24..274d7ea8 100644
--- a/src/python_minifier/transforms/remove_annotations.py
+++ b/src/python_minifier/transforms/remove_annotations.py
@@ -78,14 +78,14 @@ def is_dataclass_field(node):
             if len(node.parent.decorator_list) == 0:
                 return False
 
-            for node in node.parent.decorator_list:
-                if isinstance(node, ast.Name) and node.id == 'dataclass':
+            for decorator_node in node.parent.decorator_list:
+                if isinstance(decorator_node, ast.Name) and decorator_node.id == 'dataclass':
                     return True
-                elif isinstance(node, ast.Attribute) and node.attr == 'dataclass':
+                elif isinstance(decorator_node, ast.Attribute) and decorator_node.attr == 'dataclass':
                     return True
-                elif isinstance(node, ast.Call) and isinstance(node.func, ast.Name) and node.func.id == 'dataclass':
+                elif isinstance(decorator_node, ast.Call) and isinstance(decorator_node.func, ast.Name) and decorator_node.func.id == 'dataclass':
                     return True
-                elif isinstance(node, ast.Call) and isinstance(node.func, ast.Attribute) and node.func.attr == 'dataclass':
+                elif isinstance(decorator_node, ast.Call) and isinstance(decorator_node.func, ast.Attribute) and decorator_node.func.attr == 'dataclass':
                     return True
 
             return False
@@ -102,10 +102,10 @@ def is_typing_sensitive(node):
 
             tricky_types = ['NamedTuple', 'TypedDict']
 
-            for node in node.parent.bases:
-                if isinstance(node, ast.Name) and node.id in tricky_types:
+            for base_node in node.parent.bases:
+                if isinstance(base_node, ast.Name) and base_node.id in tricky_types:
                     return True
-                elif isinstance(node, ast.Attribute) and node.attr in tricky_types:
+                elif isinstance(base_node, ast.Attribute) and base_node.attr in tricky_types:
                     return True
 
             return False
diff --git a/src/python_minifier/transforms/remove_annotations_options.pyi b/src/python_minifier/transforms/remove_annotations_options.pyi
index aea089c5..3110542d 100644
--- a/src/python_minifier/transforms/remove_annotations_options.pyi
+++ b/src/python_minifier/transforms/remove_annotations_options.pyi
@@ -13,8 +13,6 @@ class RemoveAnnotationsOptions:
     ):
         ...
 
-    def __repr__(self) -> str: ...
-
     def __nonzero__(self) -> bool: ...
 
     def __bool__(self) -> bool: ...
diff --git a/src/python_minifier/transforms/remove_exception_brackets.py b/src/python_minifier/transforms/remove_exception_brackets.py
index 1a7dc41e..fedc59b1 100644
--- a/src/python_minifier/transforms/remove_exception_brackets.py
+++ b/src/python_minifier/transforms/remove_exception_brackets.py
@@ -14,6 +14,7 @@
 
 from python_minifier.rename.binding import BuiltinBinding
 
+
 # These are always exceptions, in every version of python
 builtin_exceptions = [
     'SyntaxError', 'Exception', 'ValueError', 'BaseException', 'MemoryError', 'RuntimeError', 'DeprecationWarning', 'UnicodeEncodeError', 'KeyError', 'LookupError', 'TypeError', 'BufferError',
@@ -80,7 +81,8 @@ def _remove_empty_call(binding):
 
     for name_node in binding.references:
         # For this to be a builtin, all references must be name nodes as it is not defined anywhere
-        assert isinstance(name_node, ast.Name) and isinstance(name_node.ctx, ast.Load)
+        assert isinstance(name_node, ast.Name)
+        assert isinstance(name_node.ctx, ast.Load)
 
         if not isinstance(name_node.parent, ast.Call):
             # This is not a call
diff --git a/src/python_minifier/transforms/remove_literal_statements.py b/src/python_minifier/transforms/remove_literal_statements.py
index 89d28189..9283421d 100644
--- a/src/python_minifier/transforms/remove_literal_statements.py
+++ b/src/python_minifier/transforms/remove_literal_statements.py
@@ -6,9 +6,8 @@
 
 def find_doc(node):
 
-    if isinstance(node, ast.Attribute):
-        if node.attr == '__doc__':
-            raise ValueError('__doc__ found!')
+    if isinstance(node, ast.Attribute) and node.attr == '__doc__':
+        raise ValueError('__doc__ found!')
 
     for child in ast.iter_child_nodes(node):
         find_doc(child)
@@ -18,7 +17,7 @@ def _doc_in_module(module):
     try:
         find_doc(module)
         return False
-    except:
+    except Exception:
         return True
 
 
diff --git a/src/python_minifier/transforms/remove_posargs.py b/src/python_minifier/transforms/remove_posargs.py
index a5e72d52..3c2f9e30 100644
--- a/src/python_minifier/transforms/remove_posargs.py
+++ b/src/python_minifier/transforms/remove_posargs.py
@@ -2,10 +2,9 @@
 
 
 def remove_posargs(node):
-    if isinstance(node, ast.arguments):
-        if hasattr(node, 'posonlyargs'):
-            node.args = node.posonlyargs + node.args
-            node.posonlyargs = []
+    if isinstance(node, ast.arguments) and hasattr(node, 'posonlyargs'):
+        node.args = node.posonlyargs + node.args
+        node.posonlyargs = []
 
     for child in ast.iter_child_nodes(node):
         remove_posargs(child)
diff --git a/src/python_minifier/transforms/suite_transformer.py b/src/python_minifier/transforms/suite_transformer.py
index 0b0982a7..d1a8c9ad 100644
--- a/src/python_minifier/transforms/suite_transformer.py
+++ b/src/python_minifier/transforms/suite_transformer.py
@@ -13,7 +13,7 @@ def visit(self, node):
 
     def generic_visit(self, node):
         """Called if no explicit visitor function exists for a node."""
-        for field, value in ast.iter_fields(node):
+        for _field, value in ast.iter_fields(node):
             if isinstance(value, list):
                 for item in value:
                     if isinstance(item, ast.AST):
diff --git a/src/python_minifier/util.py b/src/python_minifier/util.py
index d1ea6252..b8299d6d 100644
--- a/src/python_minifier/util.py
+++ b/src/python_minifier/util.py
@@ -23,9 +23,9 @@ def is_ast_node(node, types):
     actual_types = []
     for node_type in types:
         if isinstance(node_type, str):
-            node_type = getattr(ast, node_type, None)
-            if node_type is not None:
-                actual_types.append(node_type)
+            actual_type = getattr(ast, node_type, None)
+            if actual_type is not None:
+                actual_types.append(actual_type)
         else:
             actual_types.append(node_type)