mirror of https://github.com/Qiskit/qiskit.git
29 lines
994 B
YAML
29 lines
994 B
YAML
---
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upgrade:
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- |
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The ``DAGCircuit.__eq__`` method (which is used by the ``==`` operator),
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which is used to check structural equality of
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:class:`~qiskit.dagcircuit.DAGCircuit` and
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:class:`~qiskit.circuit.QuantumCircuit` instances, will now
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include the :attr:`~qiskit.circuit.QuantumCircuit.global_phase` and
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:attr:`~qiskit.circuit.QuantumCircuit.calibrations` attributes in the
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fields checked for equality. This means that circuits which would have
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evaluated as equal in prior releases may not anymore if the
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``global_phase`` or ``calibrations`` differ between the circuits. For
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example, in previous releases this would return ``True``::
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import math
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from qiskit import QuantumCircuit
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qc1 = QuantumCircuit(1)
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qc1.x(0)
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qc2 = QuantumCircuit(1, global_phase=math.pi)
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qc2.x(0)
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print(qc2 == qc1)
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However, now because the ``global_phase`` attribute of the circuits differ
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this will now return ``False``.
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