Fix some linter errors

Author: chriseclectic

qiskit_experiments/base_experiment.py

@@ -18,7 +18,7 @@
 from numbers import Integral
 from typing import List, Optional, Iterable, Tuple, Union
 
-from qiskit import transpile, assemble
+from qiskit import transpile, assemble, QuantumCircuit
 from qiskit.providers.options import Options
 from qiskit.providers.backend import Backend
 from qiskit.providers.basebackend import BaseBackend as LegacyBackend
@@ -85,7 +85,7 @@ def __init__(self, qubits: Iterable[int], experiment_type: Optional[str] = None,
 
     def run(
         self,
-        backend: "Backend",
+        backend: Backend,
         analysis: bool = True,
         experiment_data: Optional[ExperimentData] = None,
         **kwargs,
@@ -153,14 +153,14 @@ def analysis(cls, **analysis_options) -> "BaseAnalysis":
         return cls.__analysis_class__(**analysis_options)
 
     @abstractmethod
-    def circuits(self, backend=None) -> List["QuantumCircuit"]:
+    def circuits(self, backend: Optional[Backend] = None) -> List[QuantumCircuit]:
         """Return a list of experiment circuits.
 
         Args:
-            backend (Backend): Optional, a backend object.
+            backend: Optional, a backend object.
 
         Returns:
-            List[QuantumCircuit]: A list of :class:`QuantumCircuit`s.
+            A list of :class:`QuantumCircuit`s.
 
         .. note:
             These circuits should be on qubits ``[0, .., N-1]`` for an
@@ -173,10 +173,10 @@ def circuits(self, backend=None) -> List["QuantumCircuit"]:
 
     def _transpile(
         self,
-        circuits: Union["QuantumCircuit", List["QuantumCircuit"]],
-        backend: Optional["Backend"] = None,
+        circuits: Union[QuantumCircuit, List[QuantumCircuit]],
+        backend: Optional[Backend] = None,
         **transpile_options,
-    ) -> List["QuantumCircuit"]:
+    ) -> List[QuantumCircuit]:
         """Custom transpilation of circuits for running on backend.
 
         Subclasses may modify this method if they need to customize how

qiskit_experiments/randomized_benchmarking/rb_analysis.py

@@ -16,6 +16,8 @@
 from typing import Optional, List
 
 import numpy as np
+
+from qiskit.providers.options import Options
 from qiskit_experiments.base_analysis import BaseAnalysis
 from qiskit_experiments.analysis.curve_fitting import curve_fit
 from qiskit_experiments.analysis.data_processing import (

qiskit_experiments/randomized_benchmarking/rb_experiment.py

@@ -74,23 +74,6 @@ def circuits(self, backend=None):
             circuits += self._sample_circuits(self._lengths, seed=self._rng)
         return circuits
 
-    def transpiled_circuits(self, backend=None, **kwargs):
-        """Return a list of transpiled RB circuits.
-        Args:
-            backend (Backend): Optional, a backend object to use as the
-                               argument for the :func:`qiskit.transpile`
-                               function.
-            kwargs: kwarg options for the :func:`qiskit.transpile` function.
-        Returns:
-            List[QuantumCircuit]: A list of :class:`QuantumCircuit`s.
-        Raises:
-            QiskitError: if an initial layout is specified in the
-                         kwarg options for transpilation. The initial
-                         layout must be generated from the experiment.
-        """
-        circuits = super().transpiled_circuits(backend=backend, **kwargs)
-        return circuits
-
     def _sample_circuits(
         self, lengths: Iterable[int], seed: Optional[Union[int, Generator]] = None
     ):