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Stop using deprecated BaseBackend class #1501

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merged 2 commits into from
Apr 6, 2022
Merged

Stop using deprecated BaseBackend class #1501

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4a07912
Stop using deprecated BaseBackend class
mtreinish Apr 5, 2022
afa3f6e
Merge branch 'main' into drop-basebackend
hhorii Apr 6, 2022
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9 changes: 6 additions & 3 deletions qiskit/providers/aer/noise/noise_model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,6 @@
from numpy import ndarray

from qiskit.circuit import Instruction, Delay
from qiskit.providers import BaseBackend, BackendV1, BackendV2
from qiskit.providers.exceptions import BackendPropertyError
from qiskit.providers.models import BackendProperties
from qiskit.transpiler import PassManager
Expand Down Expand Up @@ -303,10 +302,14 @@ def from_backend(cls, backend,
Raises:
NoiseError: If the input backend is not valid.
"""
if isinstance(backend, BackendV2):
backend_interface_version = getattr(backend, "version", None)
if not isinstance(backend_interface_version, int):
backend_interface_version = 0

if backend_interface_version == 2:
raise NoiseError(
"NoiseModel.from_backend does not currently support V2 Backends.")
if isinstance(backend, (BaseBackend, BackendV1)):
if backend_interface_version <= 1:
properties = backend.properties()
configuration = backend.configuration()
basis_gates = configuration.basis_gates
Expand Down
4 changes: 2 additions & 2 deletions qiskit/providers/aer/pulse/system_models/pulse_system_model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@

from warnings import warn
from collections import OrderedDict
from qiskit.providers import BaseBackend, Backend
from qiskit.providers import Backend
from ...aererror import AerError
from .hamiltonian_model import HamiltonianModel

Expand Down Expand Up @@ -94,7 +94,7 @@ def from_backend(cls, backend, subsystem_list=None):
AerError: If channel or u_channel_lo are invalid.
"""

if not isinstance(backend, (BaseBackend, Backend)):
if not isinstance(backend, Backend):
raise AerError("{} is not a Qiskit backend".format(backend))

# get relevant information from backend
Expand Down