Internally importing qiskit.providers.backend.Backend should not ra…

…ise `DeprecationWarning` (#12906) (#12965)

* better module deprecation

* _pulse_library

* __getattr__

* copy qiskit.qobj.PulseQobjInstruction and qiskit.qobj.PulseLibraryItem for internal generic_backend_v2 usage

* lint

* Aer models

* skip

* more generic catch

* specific imports

(cherry picked from commit 713ab38)

Co-authored-by: Luciano Bello <bel@zurich.ibm.com>

qiskit/compiler/transpiler.py

@@ -23,7 +23,7 @@
 from qiskit.dagcircuit import DAGCircuit
 from qiskit.providers.backend import Backend
 from qiskit.providers.backend_compat import BackendV2Converter
-from qiskit.providers.models import BackendProperties
+from qiskit.providers.models.backendproperties import BackendProperties
 from qiskit.pulse import Schedule, InstructionScheduleMap
 from qiskit.transpiler import Layout, CouplingMap, PropertySet
 from qiskit.transpiler.basepasses import BasePass

qiskit/providers/basic_provider/basic_simulator.py

@@ -43,7 +43,7 @@
 from qiskit.circuit.library.standard_gates import get_standard_gate_name_mapping, GlobalPhaseGate
 from qiskit.providers import Provider
 from qiskit.providers.backend import BackendV2
-from qiskit.providers.models import BackendConfiguration
+from qiskit.providers.models.backendconfiguration import BackendConfiguration
 from qiskit.providers.options import Options
 from qiskit.qobj import QasmQobj, QasmQobjConfig, QasmQobjExperiment
 from qiskit.result import Result

qiskit/providers/fake_provider/fake_openpulse_2q.py

@@ -16,14 +16,14 @@
 import datetime
 import warnings
 
-from qiskit.providers.models import (
+from qiskit.providers.models.backendconfiguration import (
     GateConfig,
     PulseBackendConfiguration,
-    PulseDefaults,
-    Command,
     UchannelLO,
 )
+
 from qiskit.providers.models.backendproperties import Nduv, Gate, BackendProperties
+from qiskit.providers.models.pulsedefaults import PulseDefaults, Command
 from qiskit.qobj import PulseQobjInstruction
 
 from .fake_backend import FakeBackend

qiskit/providers/fake_provider/fake_openpulse_3q.py

@@ -15,13 +15,12 @@
 """
 import warnings
 
-from qiskit.providers.models import (
+from qiskit.providers.models.backendconfiguration import (
     GateConfig,
     PulseBackendConfiguration,
-    PulseDefaults,
-    Command,
     UchannelLO,
 )
+from qiskit.providers.models.pulsedefaults import PulseDefaults, Command
 from qiskit.qobj import PulseQobjInstruction
 
 from .fake_backend import FakeBackend

qiskit/providers/fake_provider/fake_pulse_backend.py

@@ -15,7 +15,8 @@
 """
 
 from qiskit.exceptions import QiskitError
-from qiskit.providers.models import PulseBackendConfiguration, PulseDefaults
+from qiskit.providers.models.backendconfiguration import PulseBackendConfiguration
+from qiskit.providers.models.pulsedefaults import PulseDefaults
 
 from .fake_qasm_backend import FakeQasmBackend
 from .utils.json_decoder import decode_pulse_defaults

qiskit/providers/fake_provider/fake_qasm_backend.py

@@ -19,7 +19,8 @@
 import warnings
 
 from qiskit.exceptions import QiskitError
-from qiskit.providers.models import BackendProperties, QasmBackendConfiguration
+from qiskit.providers.models.backendproperties import BackendProperties
+from qiskit.providers.models.backendconfiguration import QasmBackendConfiguration
 
 from .utils.json_decoder import (
     decode_backend_configuration,