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Allow passing Target as backend argument in transpile() #16000

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Allow passing Target as backend argument in transpile() #16000

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12 changes: 11 additions & 1 deletion qiskit/compiler/transpiler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@

def transpile(
circuits: _CircuitT,
backend: Backend | None = None,
backend: Backend | Target| None = None,
basis_gates: list[str] | None = None,
coupling_map: CouplingMap | list[list[int]] | None = None,
initial_layout: Layout | dict | list | None = None,
Expand Down Expand Up @@ -248,6 +248,16 @@ def callback_func(**kwargs):
or errors in passes
"""
arg_circuits_list = isinstance(circuits, list)

# Allow passing a Target as the second positional argument (backend position)
if isinstance(backend, Target):
if target is not None:
raise TypeError(
"Cannot pass a Target as the backend argument and also specify a target argument."
)
target = backend
backend = None

circuits = circuits if arg_circuits_list else [circuits]

if not circuits:
Expand Down