Satisfy linter with ir.py

kernel/modelverse_jit/ir.py

@@ -38,9 +38,9 @@ class Instruction(object):
         return self
 
     def __str__(self):
-        cg = PythonGenerator()
-        self.generate_python_def(cg)
-        return cg.code
+        code_generator = PythonGenerator()
+        self.generate_python_def(code_generator)
+        return code_generator.code
 
 class PythonGenerator(object):
     """Generates Python code from instructions."""
@@ -61,7 +61,7 @@ class PythonGenerator(object):
 
         self.append(self.indentation_string * self.indentation)
 
-    def append_line(self, line = None):
+    def append_line(self, line=None):
         """Appends the indentation string followed by the given string (if any)
            and a newline to the code generator."""
 
@@ -159,7 +159,7 @@ class ReturnInstruction(VoidInstruction):
     """Represents a return-instruction."""
 
     def __init__(self, value):
-        Instruction.__init__(self)
+        VoidInstruction.__init__(self)
         self.value = value
 
     def simplify(self):
@@ -179,7 +179,7 @@ class LoopInstruction(VoidInstruction):
     """Represents a loop-instruction, which loops until broken."""
 
     def __init__(self, body):
-        Instruction.__init__(self)
+        VoidInstruction.__init__(self)
         self.body = body
 
     def simplify(self):
@@ -258,7 +258,7 @@ class LiteralInstruction(Instruction):
         return repr(self.literal)
 
 if __name__ == "__main__":
-    exampleTree = SelectInstruction(
+    example_tree = SelectInstruction(
         LiteralInstruction(True),
         LoopInstruction(
             CompoundInstruction(
@@ -271,4 +271,4 @@ if __name__ == "__main__":
         ),
         ReturnInstruction(
             EmptyInstruction()))
-    print(exampleTree.simplify())
+    print(example_tree.simplify())