diff --git a/taxcalc/parameters.py b/taxcalc/parameters.py
index 53d92664d..d56ff59d2 100644
--- a/taxcalc/parameters.py
+++ b/taxcalc/parameters.py
@@ -9,7 +9,6 @@
 import numpy as np
 import marshmallow as ma
 import paramtools as pt
-from taxcalc.growfactors import GrowFactors
 
 
 class CompatibleDataSchema(ma.Schema):
@@ -324,7 +323,7 @@ def adjust_with_indexing(self, params_or_path, **kwargs):
             self.delete(to_delete, **kwargs)
 
             # 1.b For all others, these are years after last_known_year.
-            last_known_year = max(cpi_min_year["year"], self._last_known_year)
+            # last_known_year=max(cpi_min_year["year"],self._last_known_year)
             # calculate 2026 value, using new inflation rates, for parameters
             # that revert to their pre-TCJA values.
             long_params = ['II_brk7', 'II_brk6', 'II_brk5', 'II_brk4',
diff --git a/taxcalc/tests/test_decorators.py b/taxcalc/tests/test_decorators.py
index 830ed61b4..bdea9e590 100644
--- a/taxcalc/tests/test_decorators.py
+++ b/taxcalc/tests/test_decorators.py
@@ -6,7 +6,6 @@
 # pylint --disable=locally-disabled test_decorators.py
 
 import os
-import sys
 import importlib
 import numpy as np
 from pandas import DataFrame
@@ -311,8 +310,8 @@ def test_function_parameters_optional():
 
 def unjittable_function1(w, x, y, z):
     """Function docstring"""
-    a = x + y
-    b = w[0] + x + y + z
+    a = x + y  # pylint: disable=unused-variable
+    b = w[0] + x + y + z  # pylint: disable=unused-variable
 
 
 def unjittable_function2(w, x, y, z):
@@ -342,7 +341,7 @@ def test_iterate_jit_raises_on_unknown_return_argument():
     pf.y = np.ones((5,))
     pf.z = np.ones((5,))
     with pytest.raises(AttributeError):
-        ans = uf2(pm, pf)
+        ans = uf2(pm, pf)  # pylint: disable=unused-variable
 
 
 def magic_calc6(w, x, y, z):
diff --git a/taxcalc/tests/test_growdiff.py b/taxcalc/tests/test_growdiff.py
index 7134d7e2f..a037553e5 100644
--- a/taxcalc/tests/test_growdiff.py
+++ b/taxcalc/tests/test_growdiff.py
@@ -8,7 +8,6 @@
 import os
 import json
 import numpy as np
-import pytest
 from taxcalc import GrowDiff, GrowFactors, Policy
 
 
diff --git a/taxcalc/tests/test_records.py b/taxcalc/tests/test_records.py
index 56991f3fd..4065a24e8 100644
--- a/taxcalc/tests/test_records.py
+++ b/taxcalc/tests/test_records.py
@@ -9,26 +9,25 @@
 import json
 from io import StringIO
 import numpy as np
-from numpy.testing import assert_array_equal
 import pandas as pd
 import pytest
-from taxcalc import GrowFactors, Policy, Records, Calculator
+from taxcalc import GrowFactors, Policy, Records
 
 
 def test_incorrect_records_instantiation(cps_subsample):
     """Test docstring"""
     with pytest.raises(ValueError):
-        recs = Records(data=[])
+        _ = Records(data=[])
     with pytest.raises(ValueError):
-        recs = Records(data=cps_subsample, gfactors=[])
+        _ = Records(data=cps_subsample, gfactors=[])
     with pytest.raises(ValueError):
-        recs = Records(data=cps_subsample, gfactors=None, weights=[])
+        _ = Records(data=cps_subsample, gfactors=None, weights=[])
     with pytest.raises(ValueError):
-        recs = Records(data=cps_subsample, gfactors=None, weights=None,
-                       start_year=[])
+        _ = Records(data=cps_subsample, gfactors=None, weights=None,
+                    start_year=[])
     with pytest.raises(ValueError):
-        recs = Records(data=cps_subsample, gfactors=None, weights=None,
-                       adjust_ratios=[])
+        _ = Records(data=cps_subsample, gfactors=None, weights=None,
+                    adjust_ratios=[])
 
 
 def test_correct_records_instantiation(cps_subsample):