mirror of https://github.com/Qiskit/qiskit.git
12 lines
471 B
YAML
12 lines
471 B
YAML
---
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upgrade_circuits:
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- |
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:meth:`.DAGCircuit.control_flow_op_nodes` now always returns a list, even if empty. Previously,
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it returned ``None`` if empty, and never returned the empty list, which required special handling.
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If you need to explicitly test for emptiness in both Qiskit 1.x and 2.x, you can do::
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control_flow_nodes = dag.control_flow_op_nodes()
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if not control_flow_nodes:
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# There are no control-flow nodes.
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pass
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