Fix pylint E0606 warnings

taxcalc/calcfunctions.py

@@ -3446,8 +3446,7 @@ def CTC_new(CTC_new_c, CTC_new_rt, CTC_new_c_under6_bonus,
             ctc_new = min(ctc_new, ctc_new_reduced)
         if ctc_new > 0. and CTC_new_refund_limited:
             refund_new = max(0., ctc_new - c09200)
-            if not CTC_new_refund_limited_all_payroll:
-                limit_new = CTC_new_refund_limit_payroll_rt * ptax_oasdi
+            limit_new = CTC_new_refund_limit_payroll_rt * ptax_oasdi
             if CTC_new_refund_limited_all_payroll:
                 limit_new = CTC_new_refund_limit_payroll_rt * payrolltax
             limited_new = max(0., refund_new - limit_new)

taxcalc/calculator.py

@@ -835,9 +835,8 @@ def mtr_graph(self, calc,
         assert mars == 'ALL' or 1 <= mars <= 4
         # check validity of income_measure
         assert income_measure in ('expanded_income', 'agi', 'wages')
-        if income_measure == 'expanded_income':
-            income_variable = 'expanded_income'
-        elif income_measure == 'agi':
+        income_variable = 'expanded_income'
+        if income_measure == 'agi':
             income_variable = 'c00100'
         elif income_measure == 'wages':
             income_variable = 'e00200'

taxcalc/parameters.py

@@ -189,7 +189,9 @@ def adjust(
                 print("WARNING:")
                 print(self.warnings)
             kwargs["ignore_warnings"] = True
+            # pylint: disable=possibly-used-before-assignment
             self._data = _data
+            # pylint: enable=possibly-used-before-assignment
             _warnings = copy.deepcopy(self._warnings)
             self._warnings = {}
             self._errors = {}

taxcalc/tests/test_parameters.py

@@ -231,6 +231,7 @@ def test_json_file_contents(tests_path, fname):
                 f'type={param["value_type"]}\n'
             )
             failures += msg
+    o = None
     if fname == "consumption.json":
         o = Consumption()
     elif fname == "policy_current_law.json":