Fix lint in pylintrc (quantumlib#5952)

* Add missing comma after f-string-without-interpolation

Remove obsolete checks `mixed-indentation` and `relative-import`
specific to Python 2.  Resolve pylint 2.15 complaints about these.

* Clean redundant f-strings that show for fixed pylintrc

Author: pavoljuhas

cirq-core/cirq/circuits/circuit_operation_test.py

@@ -541,7 +541,7 @@ def test_string_format():
 
     fc0 = cirq.FrozenCircuit()
     op0 = cirq.CircuitOperation(fc0)
-    assert str(op0) == f"[  ]"
+    assert str(op0) == "[  ]"
 
     fc0_global_phase_inner = cirq.FrozenCircuit(
         cirq.global_phase_operation(1j), cirq.global_phase_operation(1j)
@@ -553,7 +553,7 @@ def test_string_format():
     op0_global_phase_outer = cirq.CircuitOperation(fc0_global_phase_outer)
     assert (
         str(op0_global_phase_outer)
-        == f"""\
+        == """\
 [                       ]
 [                       ]
 [ global phase:   -0.5π ]"""
@@ -563,7 +563,7 @@ def test_string_format():
     op1 = cirq.CircuitOperation(fc1)
     assert (
         str(op1)
-        == f"""\
+        == """\
 [ 0: ───X───────M('m')─── ]
 [               │         ]
 [ 1: ───H───@───M──────── ]
@@ -599,10 +599,10 @@ def test_string_format():
     )
     assert (
         str(op2)
-        == f"""\
+        == """\
 [ 0: ───X───X─── ]
 [           │    ]
-[ 1: ───H───@─── ](qubit_map={{q(1): q(2)}}, parent_path=('outer', 'inner'),\
+[ 1: ───H───@─── ](qubit_map={q(1): q(2)}, parent_path=('outer', 'inner'),\
  repetition_ids=['a', 'b', 'c'])"""
     )
     assert (
@@ -635,9 +635,9 @@ def test_string_format():
     indented_fc3_repr = repr(fc3).replace('\n', '\n    ')
     assert (
         str(op3)
-        == f"""\
-[ 0: ───X^b───M('m')─── ](qubit_map={{q(0): q(1)}}, \
-key_map={{m: p}}, params={{b: 2}})"""
+        == """\
+[ 0: ───X^b───M('m')─── ](qubit_map={q(0): q(1)}, \
+key_map={m: p}, params={b: 2})"""
     )
     assert (
         repr(op3)

cirq-core/cirq/experiments/readout_confusion_matrix.py

@@ -85,7 +85,7 @@ def __init__(
                         pattern.
         """
         if len(measure_qubits) == 0:
-            raise ValueError(f"measure_qubits cannot be empty.")
+            raise ValueError("measure_qubits cannot be empty.")
         if isinstance(confusion_matrices, np.ndarray):
             confusion_matrices = [confusion_matrices]
         measure_qubits = cast(

cirq-core/cirq/qis/clifford_tableau.py

@@ -174,9 +174,9 @@ def _reconstruct_rs(self, rs: Optional[np.ndarray]) -> np.ndarray:
                 new_rs = np.append(rs, np.zeros(1, dtype=bool))
             else:
                 raise ValueError(
-                    f"The value you passed for rs is not the correct shape and/or type. "
-                    f"Please confirm that it's a single row with 2*num_qubits columns "
-                    f"and of type bool."
+                    "The value you passed for rs is not the correct shape and/or type. "
+                    "Please confirm that it's a single row with 2*num_qubits columns "
+                    "and of type bool."
                 )
         return new_rs
 
@@ -196,9 +196,9 @@ def _reconstruct_xs(self, xs: Optional[np.ndarray]) -> np.ndarray:
                 new_xs = np.append(xs, np.zeros((1, self.n), dtype=bool), axis=0)
             else:
                 raise ValueError(
-                    f"The value you passed for xs is not the correct shape and/or type. "
-                    f"Please confirm that it's 2*num_qubits rows, num_qubits columns, "
-                    f"and of type bool."
+                    "The value you passed for xs is not the correct shape and/or type. "
+                    "Please confirm that it's 2*num_qubits rows, num_qubits columns, "
+                    "and of type bool."
                 )
         return new_xs
 
@@ -219,9 +219,9 @@ def _reconstruct_zs(self, zs: Optional[np.ndarray]) -> np.ndarray:
                 new_zs = np.append(zs, np.zeros((1, self.n), dtype=bool), axis=0)
             else:
                 raise ValueError(
-                    f"The value you passed for zs is not the correct shape and/or type. "
-                    f"Please confirm that it's 2*num_qubits rows, num_qubits columns, "
-                    f"and of type bool."
+                    "The value you passed for zs is not the correct shape and/or type. "
+                    "Please confirm that it's 2*num_qubits rows, num_qubits columns, "
+                    "and of type bool."
                 )
         return new_zs
 

cirq-core/cirq/testing/circuit_compare.py

@@ -241,7 +241,7 @@ def assert_circuits_have_same_unitary_given_final_permutation(
 
     if not set(qubit_map.keys()).issubset(actual.all_qubits()):
         raise ValueError(
-            f"'qubit_map' must be a mapping of the qubits in the circuit 'actual' to themselves."
+            "'qubit_map' must be a mapping of the qubits in the circuit 'actual' to themselves."
         )
 
     actual_cp = actual.unfreeze()

cirq-core/cirq/testing/routing_devices_test.py

@@ -99,7 +99,7 @@ def test_allowed_multi_qubit_gates():
     device.validate_operation(cirq.MeasurementGate(2).on(*cirq.LineQubit.range(2)))
     device.validate_operation(cirq.MeasurementGate(3).on(*cirq.LineQubit.range(3)))
 
-    with pytest.raises(ValueError, match=f"Unsupported operation"):
+    with pytest.raises(ValueError, match="Unsupported operation"):
         device.validate_operation(cirq.CCNOT(*cirq.LineQubit.range(3)))
 
     device.validate_operation(cirq.CNOT(*cirq.LineQubit.range(2)))

cirq-google/cirq_google/engine/engine_validator.py

@@ -51,7 +51,7 @@ def _verify_reps(
             total_reps += len(list(cirq.to_resolvers(sweep))) * repetitions
     if total_reps > max_repetitions:
         raise RuntimeError(
-            f'No requested processors currently support the number of requested total repetitions.'
+            'No requested processors currently support the number of requested total repetitions.'
         )
 
 

cirq-google/cirq_google/engine/qcs_notebook.py

@@ -106,7 +106,7 @@ def get_qcs_objects_for_notebook(
                 print("Authentication complete.")
             except Exception as exc:
                 print(f"Authentication failed: {exc}")
-                print(f"Using virtual engine instead.")
+                print("Using virtual engine instead.")
                 virtual = True
 
     if not virtual:

dev_tools/conf/.pylintrc

@@ -20,7 +20,7 @@ enable=
     docstyle,
     duplicate-argument-name,
     expression-not-assigned,
-    f-string-without-interpolation
+    f-string-without-interpolation,
     function-redefined,
     inconsistent-mro,
     init-is-generator,
@@ -29,14 +29,12 @@ enable=
     missing-kwoa,
     missing-param-doc,
     missing-raises-doc,
-    mixed-indentation,
     mixed-line-endings,
     no-value-for-parameter,
     nonexistent-operator,
     not-in-loop,
     pointless-statement,
     redefined-builtin,
-    relative-import,
     return-arg-in-generator,
     return-in-init,
     return-outside-function,