diff --git a/osaca/db_interface.py b/osaca/db_interface.py
index 8c32dd7..85e53dd 100644
--- a/osaca/db_interface.py
+++ b/osaca/db_interface.py
@@ -10,9 +10,7 @@
 import ruamel.yaml
 
 from osaca.semantics import MachineModel
-from osaca.parser.memory import MemoryOperand
 from osaca.parser.register import RegisterOperand
-from osaca.parser.immediate import ImmediateOperand
 from osaca.parser.instruction_form import InstructionForm
 
 
diff --git a/osaca/parser/immediate.py b/osaca/parser/immediate.py
index 742819c..45a1972 100644
--- a/osaca/parser/immediate.py
+++ b/osaca/parser/immediate.py
@@ -36,7 +36,7 @@ def shift(self):
         return self._imd_type
 
     @imd_type.setter
-    def imd_type(self, type):
+    def imd_type(self, imd_type):
         self._imd_type = imd_type
 
     @identifier.setter
diff --git a/osaca/parser/parser_AArch64.py b/osaca/parser/parser_AArch64.py
index e858732..62ec851 100644
--- a/osaca/parser/parser_AArch64.py
+++ b/osaca/parser/parser_AArch64.py
@@ -12,7 +12,6 @@
 from osaca.parser.identifier import IdentifierOperand
 from osaca.parser.immediate import ImmediateOperand
 from osaca.parser.condition import ConditionOperand
-from osaca.parser.flag import FlagOperand
 from osaca.parser.prefetch import PrefetchOperand
 
 
diff --git a/osaca/parser/parser_x86att.py b/osaca/parser/parser_x86att.py
index b02d5bf..c6d67b8 100644
--- a/osaca/parser/parser_x86att.py
+++ b/osaca/parser/parser_x86att.py
@@ -7,14 +7,12 @@
 
 from osaca.parser import BaseParser
 from osaca.parser.instruction_form import InstructionForm
-from osaca.parser.operand import Operand
 from osaca.parser.directive import DirectiveOperand
 from osaca.parser.memory import MemoryOperand
 from osaca.parser.label import LabelOperand
 from osaca.parser.register import RegisterOperand
 from osaca.parser.identifier import IdentifierOperand
 from osaca.parser.immediate import ImmediateOperand
-from osaca.parser.flag import FlagOperand
 
 
 class ParserX86ATT(BaseParser):
diff --git a/osaca/semantics/hw_model.py b/osaca/semantics/hw_model.py
index c3e19a1..e05dd5f 100644
--- a/osaca/semantics/hw_model.py
+++ b/osaca/semantics/hw_model.py
@@ -11,7 +11,6 @@
 
 import ruamel.yaml
 from osaca import __version__, utils
-from copy import deepcopy
 from osaca.parser import ParserX86ATT
 from osaca.parser.instruction_form import InstructionForm
 from osaca.parser.operand import Operand
@@ -261,10 +260,10 @@ def operand_to_class(self, o, new_operands):
         elif o["class"] == "prfop":
             new_operands.append(
                 PrefetchOperand(
-                type_id=o["type"] if "type" in o else None,
-                target=o["target"] if "target" in o else None,
-                policy=o["policy"] if "policy" in o else None,
-            )
+                    type_id=o["type"] if "type" in o else None,
+                    target=o["target"] if "target" in o else None,
+                    policy=o["policy"] if "policy" in o else None,
+                )
             )
         else:
             new_operands.append(o)
diff --git a/osaca/semantics/kernel_dg.py b/osaca/semantics/kernel_dg.py
index a061749..c9d64a5 100644
--- a/osaca/semantics/kernel_dg.py
+++ b/osaca/semantics/kernel_dg.py
@@ -12,7 +12,6 @@
 from osaca.parser.memory import MemoryOperand
 from osaca.parser.register import RegisterOperand
 from osaca.parser.immediate import ImmediateOperand
-from osaca.parser.operand import Operand
 from osaca.parser.flag import FlagOperand
 
 
diff --git a/tests/test_db_interface.py b/tests/test_db_interface.py
index c5879e1..f26ffa2 100755
--- a/tests/test_db_interface.py
+++ b/tests/test_db_interface.py
@@ -7,7 +7,7 @@
 from io import StringIO
 
 import osaca.db_interface as dbi
-from osaca.db_interface import sanity_check, _get_full_instruction_name
+from osaca.db_interface import sanity_check
 from osaca.semantics import MachineModel
 from osaca.parser import InstructionForm
 from osaca.parser.memory import MemoryOperand
diff --git a/tests/test_parser_AArch64.py b/tests/test_parser_AArch64.py
index aebe58d..c895c99 100755
--- a/tests/test_parser_AArch64.py
+++ b/tests/test_parser_AArch64.py
@@ -234,7 +234,7 @@ def test_parse_line(self):
         instruction_form_5 = InstructionForm(
             mnemonic="prfm",
             operands=[
-                PrefetchOperand(type_id=["PLD"],target=["L1"],policy=["KEEP"]),
+                PrefetchOperand(type_id=["PLD"], target=["L1"], policy=["KEEP"]),
                 MemoryOperand(
                     offset=ImmediateOperand(value=2048),
                     base=RegisterOperand(prefix="x", name="26"),