diff --git a/tools/spec.py b/tools/spec.py
index f4969f5..fa3bb85 100644
--- a/tools/spec.py
+++ b/tools/spec.py
@@ -96,7 +96,7 @@ class AliasType(Type):
     May be serialised using an appropriate host language facility
     (eg, a typedef)
     """
-    def __init__(self, name: str, target: str, depends: List[str]=None):
+    def __init__(self, name: str, target: str, depends: List[str] = None):
         depends = depends or []
         super().__init__(name, depends=depends+[target])
         self.target = target
@@ -139,7 +139,7 @@ class Unscoped(Type):
     def declare(self):
         return "\n".join(t.declare() for t in self.values)
 
-    def define(self,reg):
+    def define(self, reg):
         return "\n".join(t.define(reg.types) for t in self.values)
 
 
@@ -286,7 +286,7 @@ class Enum(Type):
         }
 
     def define(self, reg: Registry):
-        values = ("%(name)s = %(value)s" % { "name": k, "value": v.value } for (k,v) in self.values.items())
+        values = ("%(name)s = %(value)s" % {"name": k, "value": v.value} for (k, v) in self.values.items())
 
         return "enum %(name)s : int32_t { %(values)s };" % {
             "name": self.name,
@@ -407,7 +407,7 @@ class Constant(Type):
         elif 'value' in node.attrib:
             self.value = node.attrib['value']
         elif 'bitpos' in node.attrib:
-            self.value = "1 << %s"  % node.attrib['bitpos']
+            self.value = "1 << %s" % node.attrib['bitpos']
         else:
             raise RuntimeError("Unknown constant value type")
 
@@ -425,7 +425,7 @@ class Command(Type):
             assert node.tag == 'param'
 
             super().__init__(
-                name = node.find('name').text,
+                name=node.find('name').text,
                 depends=[node.find('type').text],
                 **kwargs
             )
@@ -489,7 +489,7 @@ class Command(Type):
             return False
         return True
 
-    def is_device(self, reg:Registry):
+    def is_device(self, reg: Registry):
         return not self.is_instance(reg)
 
 
@@ -608,12 +608,13 @@ class Extension(Type):
 
         logging.info("Applying extension:", self.name, file=sys.stderr)
         for node in self.requires:
-            required += node.apply(reg,extnumber=self.number)
+            required += node.apply(reg, extnumber=self.number)
         return required
 
 
 ###############################################################################
-def ignore_node(types:Dict[str, Type], root):
+def ignore_node(types: Dict[str, Type], root):
+    types, root
     pass
 
 parse_comment = ignore_node
@@ -643,7 +644,7 @@ def parse_types(reg: Registry, root):
         #
         # eg, 'Display' depends on 'X11/Xlib.h'
         if not category:
-            reg.types[name] = Placeholder (name)
+            reg.types[name] = Placeholder(name)
         else:
             # Whitelist the known types so we don't accidentally instantiate
             # something whacky
@@ -736,7 +737,6 @@ def write_header(path: str, q: List[Type], reg: Registry):
             dst.write(obj.define(reg))
             dst.write('\n')
 
-
         # Define the default case for device and instance type traits.
         dst.write("""
         #include <type_traits>
@@ -868,7 +868,6 @@ def write_dispatch(path: str, q: List[Type], reg: Registry):
             else:
                 raise Exception("Unknown param type")
 
-
             dispatch.write(f"""
             extern "C" {obj.result} {rename(obj.name)} ({", ".join(p.param for p in obj.params)}) noexcept {{
                 using first_arg_t = std::decay_t<decltype({obj.params[0].name})>;