Remove dependency on the flynt tool (#6164)

- pylint - enable `consider-using-f-string` check
- Test package metadata with numpy rather than flynt
- Fix CI complains on test coverage - fix markup for ignoring coverage
- Temporarily disable consider-using-f-string pylint and add TODO-s to fix later
- Format touched files with black-23.3.0

Partially fixes #6171

---------

Co-authored-by: Tanuj Khattar <tanujkhattar@google.com>

cirq-core/cirq/_compat_test.py

@@ -200,9 +200,8 @@ def old_func(*args, **kwargs):
 
     with pytest.raises(AssertionError, match='deadline should match vX.Y'):
         # pylint: disable=unused-variable
-        # coverage: ignore
         @deprecated(deadline='invalid', fix='Roll some dice.')
-        def badly_deprecated_func(*args, **kwargs):
+        def badly_deprecated_func(*args, **kwargs):  # pragma: no cover
             return new_func(*args, **kwargs)
 
         # pylint: enable=unused-variable
@@ -258,8 +257,7 @@ def f(new_count):
             rewrite=lambda args, kwargs: (args, {'new_count': kwargs['double_count'] * 2}),
         )
         # pylint: disable=unused-variable
-        # coverage: ignore
-        def f_with_badly_deprecated_param(new_count):
+        def f_with_badly_deprecated_param(new_count):  # pragma: no cover
             return new_count
 
         # pylint: enable=unused-variable
@@ -371,9 +369,8 @@ class OldClass(NewClass):
 
     with pytest.raises(AssertionError, match='deadline should match vX.Y'):
         # pylint: disable=unused-variable
-        # coverage: ignore
         @deprecated_class(deadline='invalid', fix='theFix', name='foo')
-        class BadlyDeprecatedClass(NewClass):
+        class BadlyDeprecatedClass(NewClass):  # pragma: no cover
             ...
 
         # pylint: enable=unused-variable
@@ -619,8 +616,6 @@ def subprocess_context(test_func):
         "it to this method?"
     )
 
-    import os
-
     ctx = multiprocessing.get_context('spawn' if os.name == 'nt' else 'fork')
 
     exception = ctx.Queue()
@@ -632,8 +627,7 @@ def isolated_func(*args, **kwargs):
         p.start()
         p.join()
         result = exception.get()
-        if result:
-            # coverage: ignore
+        if result:  # pragma: no cover
             ex_type, msg, ex_trace = result
             if ex_type == "Skipped":
                 warnings.warn(f"Skipping: {ex_type}: {msg}\n{ex_trace}")
@@ -727,7 +721,7 @@ def _test_metadata_search_path_inner():  # pragma: no cover
     # pylint: disable=unused-import
     import cirq.testing._compat_test_data.module_a
 
-    assert importlib.metadata.metadata('flynt')
+    assert importlib.metadata.metadata('numpy')
 
 
 def test_metadata_distributions_after_deprecated_submodule():

cirq-core/cirq/circuits/_block_diagram_drawer_test.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import itertools
 
 import pytest

cirq-core/cirq/circuits/circuit_operation.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """A structure for encapsulating entire circuits in an operation.
 
 A CircuitOperation is an Operation object that wraps a FrozenCircuit. When

cirq-core/cirq/circuits/text_diagram_drawer_test.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from unittest import mock
 import pytest
 

cirq-core/cirq/contrib/acquaintance/bipartite.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import enum
 import itertools
 from typing import Dict, Sequence, Tuple, Union, TYPE_CHECKING

cirq-core/cirq/contrib/acquaintance/devices.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Union, TYPE_CHECKING
 
 import abc

cirq-core/cirq/contrib/acquaintance/gates.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import functools
 import itertools
 import math

cirq-core/cirq/contrib/acquaintance/testing.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import cast, Sequence, TYPE_CHECKING
 
 from cirq import devices, ops, protocols

cirq-core/cirq/contrib/paulistring/recombine.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Any, Callable, Iterable, Sequence, Tuple, Union, cast, List
 
 from cirq import circuits, ops, protocols
@@ -27,7 +30,6 @@ def _sorted_best_string_placements(
     output_ops: Sequence[ops.Operation],
     key: Callable[[Any], ops.PauliStringPhasor] = lambda node: node.val,
 ) -> List[Tuple[ops.PauliStringPhasor, int, circuitdag.Unique[ops.PauliStringPhasor]]]:
-
     sort_key = lambda placement: (-len(placement[0].pauli_string), placement[1])
 
     node_maxes = []
@@ -84,7 +86,6 @@ def move_pauli_strings_into_circuit(
         # Pick the Pauli string that can be moved furthest through
         # the Clifford circuit
         for best_string_op, best_index, best_node in placements:
-
             assert (
                 best_index <= last_index
             ), "Unexpected insertion index order, {} >= {}, len: {}".format(

cirq-core/cirq/contrib/qasm_import/_parser.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import functools
 import operator
 from typing import Any, Callable, cast, Dict, Iterable, List, Optional, Union, TYPE_CHECKING

cirq-core/cirq/contrib/qasm_import/_parser_test.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Callable
 
 import numpy as np

cirq-core/cirq/contrib/qcircuit/qcircuit_test.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import cirq
 import cirq.contrib.qcircuit as ccq
 import cirq.testing as ct

cirq-core/cirq/contrib/quirk/quirk_gate.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Any, Callable, cast, Dict, Optional, Union
 
 import numpy as np

cirq-core/cirq/devices/noise_model.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Any, Dict, Iterable, Sequence, TYPE_CHECKING, Union, Callable
 
 from cirq import ops, protocols, value

cirq-core/cirq/linalg/diagonalize_test.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import random
 from typing import Tuple, Optional
 

cirq-core/cirq/linalg/transformations.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Utility methods for transforming matrices or vectors."""
 
 import dataclasses

cirq-core/cirq/ops/clifford_gate.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Any, Dict, List, Optional, Sequence, Tuple, TYPE_CHECKING, Union
 
 
@@ -434,7 +437,6 @@ def _decompose_(self, qubits: Sequence['cirq.Qid']) -> 'cirq.OP_TREE':
     def _act_on_(
         self, sim_state: 'cirq.SimulationStateBase', qubits: Sequence['cirq.Qid']
     ) -> Union[NotImplementedType, bool]:
-
         # Note the computation complexity difference between _decompose_ and _act_on_.
         # Suppose this Gate has `m` qubits, args has `n` qubits, and the decomposition of
         # this operation into `k` operations:

cirq-core/cirq/ops/common_gate_families.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Common Gate Families used in cirq-core"""
 
 from typing import Any, cast, Optional, Type, Union

cirq-core/cirq/ops/common_gates.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Quantum gates that are commonly used in the literature.
 
 This module creates Gate instances for the following gates:

cirq-core/cirq/ops/diagonal_gate.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Creates the gate instance for any number qubits diagonal gate.
 
 The gate is used to create a (2^n)x(2^n) matrix with the diagonal elements

cirq-core/cirq/ops/gateset_test.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Tuple, List, cast
 import re
 import pytest

cirq-core/cirq/ops/linear_combinations.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from collections import defaultdict
 from typing import (
     AbstractSet,

cirq-core/cirq/ops/raw_types.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Basic types defining qubits, gates, and operations."""
 
 import abc

cirq-core/cirq/ops/three_qubit_gates.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Common quantum gates that target three qubits."""
 
 from typing import (

cirq-core/cirq/ops/two_qubit_diagonal_gate.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """Creates the gate instance for a two qubit diagonal gate.
 
 The gate is used to create a 4x4 matrix with the diagonal elements

cirq-core/cirq/protocols/apply_channel_protocol.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """A protocol for implementing high performance channel evolutions."""
 
 from typing import Any, Iterable, Optional, Sequence, TypeVar, Tuple, Union

cirq-core/cirq/protocols/apply_mixture_protocol.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """A protocol for implementing high performance mixture evolutions."""
 
 from typing import Any, cast, Iterable, Optional, Tuple, TypeVar, Union

cirq-core/cirq/protocols/apply_unitary_protocol.py

@@ -11,7 +11,12 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 """A protocol for implementing high performance unitary left-multiplies."""
+
 import warnings
 from typing import Any, cast, Iterable, Optional, Sequence, Tuple, TYPE_CHECKING, TypeVar, Union
 

cirq-core/cirq/protocols/circuit_diagram_info_protocol.py

@@ -11,6 +11,10 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 import re
 from fractions import Fraction
 from typing import (
@@ -122,7 +126,6 @@ def _wire_symbols_including_formatted_exponent(
         return result
 
     def _formatted_exponent(self, args: 'cirq.CircuitDiagramInfoArgs') -> Optional[str]:
-
         if protocols.is_parameterized(self.exponent):
             name = str(self.exponent)
             return f'({name})' if _is_exposed_formula(name) else name

cirq-core/cirq/protocols/inverse_protocol.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# TODO(#6171): enable the check and fix pylint errors
+# pylint: disable=consider-using-f-string
+
 from typing import Any, List, overload, Tuple, TYPE_CHECKING, TypeVar, Union, Iterable
 
 from cirq import ops