Add missing-raises-doc rule to the linter and subsequent refactor.

cirq-aqt/cirq_aqt/aqt_device.py

@@ -31,12 +31,14 @@
 gate_dict = {'X': cirq.X, 'Y': cirq.Y, 'Z': cirq.Z, 'MS': cirq.XX, 'R': cirq.PhasedXPowGate}
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def get_op_string(op_obj: cirq.Operation) -> str:
     """Find the string representation for a given gate
 
     Args:
         op_obj: Gate object, one of: XXPowGate, XPowGate, YPowGate, ZPowGate,
-        PhasedXPowGate
+            PhasedXPowGate
 
     Returns:
         String representing the gate operations
@@ -58,8 +60,9 @@ def get_op_string(op_obj: cirq.Operation) -> str:
     return op_str
 
 
+# pylint: enable=missing-raises-doc
 class AQTNoiseModel(cirq.NoiseModel):
-    """A noise model for the AQT ion trap """
+    """A noise model for the AQT ion trap"""
 
     def __init__(self):
         self.noise_op_dict = get_default_noise_dict()
@@ -190,6 +193,8 @@ def generate_circuit_from_list(self, json_string: str):
         # Github issue: https://github.com/quantumlib/Cirq/issues/2199
         self.circuit.append(cirq.measure(*[qubit for qubit in self.qubit_list], key='m'))
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def simulate_samples(self, repetitions: int) -> cirq.Result:
         """Samples the circuit
 
@@ -210,6 +215,7 @@ def simulate_samples(self, repetitions: int) -> cirq.Result:
         return result
 
 
+# pylint: enable=missing-raises-doc
 def get_aqt_device(num_qubits: int) -> Tuple[cirq.IonDevice, List[cirq.LineQubit]]:
     """Returns an AQT ion device
 

cirq-aqt/cirq_aqt/aqt_sampler.py

@@ -50,12 +50,14 @@ def __init__(self, remote_host: str, access_token: str):
         self.remote_host = remote_host
         self.access_token = access_token
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def _generate_json(
         self,
         circuit: cirq.Circuit,
         param_resolver: cirq.ParamResolverOrSimilarType,
     ) -> str:
-        """Generates the JSON string from a Circuit
+        """Generates the JSON string from a Circuit.
 
         The json format is defined as follows:
 
@@ -99,6 +101,7 @@ def _generate_json(
         json_str = json.dumps(seq_list)
         return json_str
 
+    # TODO(#3388) Add documentation for Raises.
     def _send_json(
         self,
         *,
@@ -171,6 +174,7 @@ def _send_json(
                 measurements[i, j] = int(measurement_int_bin[j])
         return measurements
 
+    # pylint: enable=missing-raises-doc
     def run_sweep(
         self, program: cirq.Circuit, params: cirq.Sweepable, repetitions: int = 1
     ) -> List[cirq.Result]:

cirq-core/cirq/circuits/circuit.py

@@ -1814,6 +1814,8 @@ def zip(
 
     zip.__doc__ = AbstractCircuit.zip.__doc__
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def transform_qubits(
         self,
         qubit_map: Union[Dict['cirq.Qid', 'cirq.Qid'], Callable[['cirq.Qid'], 'cirq.Qid']],
@@ -1847,6 +1849,7 @@ def transform_qubits(
             new_device=self.device if new_device is None else new_device, qubit_mapping=transform
         )
 
+    # pylint: enable=missing-raises-doc
     def _prev_moment_available(self, op: 'cirq.Operation', end_moment_index: int) -> Optional[int]:
         last_available = end_moment_index
         k = end_moment_index
@@ -2083,6 +2086,8 @@ def _insert_operations(
                 self._moments[moment_index].operations + tuple(new_ops)
             )
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def insert_at_frontier(
         self, operations: 'cirq.OP_TREE', start: int, frontier: Dict['cirq.Qid', int] = None
     ) -> Dict['cirq.Qid', int]:
@@ -2116,6 +2121,7 @@ def insert_at_frontier(
 
         return frontier
 
+    # pylint: enable=missing-raises-doc
     def batch_remove(self, removals: Iterable[Tuple[int, 'cirq.Operation']]) -> None:
         """Removes several operations from a circuit.
 
@@ -2125,11 +2131,9 @@ def batch_remove(self, removals: Iterable[Tuple[int, 'cirq.Operation']]) -> None
                 listed operations must actually be present or the edit will
                 fail (without making any changes to the circuit).
 
-        ValueError:
-            One of the operations to delete wasn't present to start with.
-
-        IndexError:
-            Deleted from a moment that doesn't exist.
+        Raises:
+            ValueError: One of the operations to delete wasn't present to start with.
+            IndexError: Deleted from a moment that doesn't exist.
         """
         copy = self.copy()
         for i, op in removals:
@@ -2152,11 +2156,9 @@ def batch_replace(
                 operations must actually be present or the edit will fail
                 (without making any changes to the circuit).
 
-        ValueError:
-            One of the operations to replace wasn't present to start with.
-
-        IndexError:
-            Replaced in a moment that doesn't exist.
+        Raises:
+            ValueError: One of the operations to replace wasn't present to start with.
+            IndexError: Replaced in a moment that doesn't exist.
         """
         copy = self.copy()
         for i, op, new_op in replacements:

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

@@ -131,6 +131,8 @@ class GreedyExecutionStrategy(ExecutionStrategy):
     qubits in any order are inserted.
     """
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def __init__(
         self, gates: LogicalGates, initial_mapping: LogicalMapping, device: 'cirq.Device' = None
     ) -> None:
@@ -149,6 +151,7 @@ def __init__(
         self._initial_mapping = initial_mapping.copy()
         self._device = device or devices.UNCONSTRAINED_DEVICE
 
+    # pylint: enable=missing-raises-doc
     @property
     def initial_mapping(self) -> LogicalMapping:
         return self._initial_mapping

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

@@ -28,6 +28,8 @@
 STRATEGY_GATE = Union[AcquaintanceOpportunityGate, PermutationGate]
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def rectify_acquaintance_strategy(circuit: 'cirq.Circuit', acquaint_first: bool = True) -> None:
     """Splits moments so that they contain either only acquaintance gates
     or only permutation gates. Orders resulting moments so that the first one
@@ -57,6 +59,7 @@ def rectify_acquaintance_strategy(circuit: 'cirq.Circuit', acquaint_first: bool
     circuit._moments = rectified_moments
 
 
+# pylint: enable=missing-raises-doc
 # TODO(#3388) Add summary line to docstring.
 # pylint: disable=docstring-first-line-empty
 def replace_acquaintance_with_swap_network(

cirq-core/cirq/contrib/acquaintance/strategies/complete.py

@@ -28,7 +28,8 @@
 
 
 # TODO(#3388) Add summary line to docstring.
-# pylint: disable=docstring-first-line-empty
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=docstring-first-line-empty,missing-raises-doc
 def complete_acquaintance_strategy(
     qubit_order: Sequence['cirq.Qid'], acquaintance_size: int = 0, swap_gate: 'cirq.Gate' = ops.SWAP
 ) -> 'cirq.Circuit':
@@ -65,4 +66,4 @@ def complete_acquaintance_strategy(
     return strategy
 
 
-# pylint: enable=docstring-first-line-empty
+# pylint: enable=docstring-first-line-empty,missing-raises-doc

cirq-core/cirq/contrib/graph_device/graph_device.py

@@ -120,6 +120,8 @@ class UndirectedGraphDevice(devices.Device):
         * duration_of does not check that operation is valid.
     """
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def __init__(
         self,
         device_graph: Optional[UndirectedHypergraph] = None,
@@ -148,6 +150,7 @@ def __init__(
         self.device_graph = device_graph
         self.crosstalk_graph = crosstalk_graph
 
+    # pylint: enable=missing-raises-doc
     @property
     def qubits(self) -> Tuple['cirq.Qid', ...]:
         return cast(Tuple['cirq.Qid', ...], tuple(sorted(self.device_graph.vertices)))

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

@@ -23,6 +23,8 @@
 from cirq.contrib.qcircuit.qcircuit_diagram import circuit_to_latex_using_qcircuit
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def circuit_to_pdf_using_qcircuit_via_tex(
     circuit: circuits.Circuit,
     filepath: str,
@@ -63,3 +65,6 @@ def circuit_to_pdf_using_qcircuit_via_tex(
         except (OSError, IOError) as e:
             if e.errno != errno.ENOENT:
                 raise
+
+
+# pylint: enable=missing-raises-doc

cirq-core/cirq/contrib/quimb/density_matrix.py

@@ -70,6 +70,8 @@ def _add_to_positions(
     positions[(f'i{mi}b', _qpos_tag(qubits))] = (mi * x_scale, y_scale * qy + yb_offset)
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def circuit_to_density_matrix_tensors(
     circuit: cirq.Circuit, qubits: Optional[Sequence[cirq.LineQubit]] = None
 ) -> Tuple[List[qtn.Tensor], Dict['cirq.Qid', int], Dict[Tuple[str, str], Tuple[float, float]]]:
@@ -186,6 +188,7 @@ def _positions(mi, qubits):
     return tensors, qubit_frontier, positions
 
 
+# pylint: enable=missing-raises-doc
 def tensor_density_matrix(
     circuit: cirq.Circuit, qubits: Optional[List[cirq.LineQubit]] = None
 ) -> np.ndarray:

cirq-core/cirq/contrib/quimb/mps_simulator.py

@@ -59,6 +59,8 @@ class MPSSimulator(
 ):
     """An efficient simulator for MPS circuits."""
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def __init__(
         self,
         noise: 'cirq.NOISE_MODEL_LIKE' = None,
@@ -85,6 +87,7 @@ def __init__(
             seed=seed,
         )
 
+    # pylint: enable=missing-raises-doc
     def _create_partial_act_on_args(
         self,
         initial_state: Union[int, 'MPSState'],
@@ -206,6 +209,8 @@ def _simulator_state(self):
 class MPSState(ActOnArgs):
     """A state of the MPS simulation."""
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     @deprecated_parameter(
         deadline='v0.13',
         fix='No longer needed. `protocols.act_on` infers axes.',
@@ -274,6 +279,7 @@ def __init__(
         self.simulation_options = simulation_options
         self.estimated_gate_error_list: List[float] = []
 
+    # pylint: enable=missing-raises-doc
     def i_str(self, i: int) -> str:
         # Returns the index name for the i'th qid.
         return self.format_i.format(i)
@@ -464,6 +470,8 @@ def estimation_stats(self):
             "estimated_fidelity": estimated_fidelity,
         }
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def perform_measurement(
         self, qubits: Sequence[ops.Qid], prng: np.random.RandomState, collapse_state_vector=True
     ) -> List[int]:
@@ -513,6 +521,7 @@ def perform_measurement(
 
         return results
 
+    # pylint: enable=missing-raises-doc
     def _perform_measurement(self, qubits: Sequence['cirq.Qid']) -> List[int]:
         """Measures the axes specified by the simulator."""
         return self.perform_measurement(qubits, self.prng)

cirq-core/cirq/contrib/quimb/state_vector.py

@@ -24,6 +24,8 @@ def _get_quimb_version():
 QUIMB_VERSION = _get_quimb_version()
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def circuit_to_tensors(
     circuit: cirq.Circuit,
     qubits: Optional[Sequence[cirq.Qid]] = None,
@@ -84,6 +86,7 @@ def circuit_to_tensors(
     return tensors, qubit_frontier, positions
 
 
+# pylint: enable=missing-raises-doc
 def tensor_state_vector(
     circuit: cirq.Circuit, qubits: Optional[Sequence[cirq.Qid]] = None
 ) -> np.ndarray:

cirq-core/cirq/contrib/routing/router.py

@@ -25,6 +25,8 @@
 }
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def route_circuit(
     circuit: circuits.Circuit,
     device_graph: nx.Graph,
@@ -35,15 +37,15 @@ def route_circuit(
 ) -> SwapNetwork:
     """Routes a circuit on a given device.
 
+    Exactly one of algo_name and router must be specified.
+
     Args:
         circuit: The circuit to route.
         device_graph: The device's graph, in which each vertex is a qubit and
             each edge indicates the ability to do an operation on those qubits.
         algo_name: The name of a routing algorithm. Must be in ROUTERS.
         router: The function that actually does the routing.
         **kwargs: Arguments to pass to the routing algorithm.
-
-    Exactly one of algo_name and router must be specified.
     """
 
     if any(protocols.num_qubits(op) > 2 for op in circuit.all_operations()):
@@ -59,3 +61,6 @@ def route_circuit(
     elif router is None:
         raise ValueError(f'No routing algorithm specified.')
     return router(circuit, device_graph, **kwargs)
+
+
+# pylint: enable=missing-raises-doc

cirq-core/cirq/contrib/routing/utils.py

@@ -55,6 +55,8 @@ def ops_are_consistent_with_device_graph(
     return True
 
 
+# TODO(#3388) Add documentation for Raises.
+# pylint: disable=missing-raises-doc
 def is_valid_routing(
     circuit: circuits.Circuit,
     swap_network: SwapNetwork,
@@ -82,6 +84,7 @@ def is_valid_routing(
         raise
 
 
+# pylint: enable=missing-raises-doc
 def get_circuit_connectivity(circuit: 'cirq.Circuit') -> nx.Graph:
     """Return a graph of all 2q interactions in a circuit.
 

cirq-core/cirq/devices/noise_model.py

@@ -38,6 +38,8 @@ class NoiseModel(metaclass=value.ABCMetaImplementAnyOneOf):
     dynamically rewrite the program they are simulating.
     """
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     @classmethod
     def from_noise_model_like(cls, noise: 'cirq.NOISE_MODEL_LIKE') -> 'cirq.NoiseModel':
         """Transforms an object into a noise model if umambiguously possible.
@@ -72,6 +74,7 @@ def from_noise_model_like(cls, noise: 'cirq.NOISE_MODEL_LIKE') -> 'cirq.NoiseMod
             'or a single qubit gate). Got {!r}'.format(noise)
         )
 
+    # pylint: enable=missing-raises-doc
     def is_virtual_moment(self, moment: 'cirq.Moment') -> bool:
         """Returns true iff the given moment is non-empty and all of its
         operations are virtual.

cirq-core/cirq/experiments/cross_entropy_benchmarking.py

@@ -166,6 +166,8 @@ def depolarizing_model(self) -> CrossEntropyDepolarizingModel:
             spam_depolarization=params[0], cycle_depolarization=params[1], covariance=covariance
         )
 
+    # TODO(#3388) Add documentation for Raises.
+    # pylint: disable=missing-raises-doc
     def purity_depolarizing_model(self) -> CrossEntropyDepolarizingModel:
         """Fit a depolarizing error model for a cycle to purity data.
 
@@ -193,6 +195,7 @@ def purity_depolarizing_model(self) -> CrossEntropyDepolarizingModel:
             spam_depolarization=params[0], cycle_depolarization=params[1], covariance=covariance
         )
 
+    # pylint: enable=missing-raises-doc
     @classmethod
     def _from_json_dict_(cls, data, repetitions, **kwargs):
         purity_data = kwargs.get('purity_data', None)