mirror of https://github.com/Qiskit/qiskit.git
55 lines
2.0 KiB
YAML
55 lines
2.0 KiB
YAML
---
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issues:
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- |
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Running functions that use ``qiskit.tools.parallel_map()`` (for example
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``qiskit.execute``, ``qiskit.transpile``, and
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``qiskit.transpiler.passmanager.PassManager.run()``) may not work when
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called from a script running outside of a ``if __name__ == '__main__':``
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block when using Python 3.8 on MacOS. Other environments are uneffected by
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this issue. This is due to changes in how parallel processes are launched
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by Python 3.8 on MacOS. If ``RuntimeError`` or ``AttributeError`` are raised
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by scripts that are directly calling ``parallel_map()`` or when
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calling a function that uses it internally with Python 3.8 on MacOS
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embedding the script calls inside ``if __name__ == '__main__':`` should
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workaround the issue. For example::
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from qiskit import QuantumCircuit, QiskitError
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from qiskit import execute, BasicAer
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qc1 = QuantumCircuit(2, 2)
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qc1.h(0)
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qc1.cx(0, 1)
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qc1.measure([0,1], [0,1])
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# making another circuit: superpositions
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qc2 = QuantumCircuit(2, 2)
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qc2.h([0,1])
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qc2.measure([0,1], [0,1])
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execute([qc1, qc2], BasicAer.get_backend('qasm_simulator'))
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should be changed to::
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from qiskit import QuantumCircuit, QiskitError
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from qiskit import execute, BasicAer
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def main():
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qc1 = QuantumCircuit(2, 2)
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qc1.h(0)
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qc1.cx(0, 1)
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qc1.measure([0,1], [0,1])
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# making another circuit: superpositions
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qc2 = QuantumCircuit(2, 2)
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qc2.h([0,1])
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qc2.measure([0,1], [0,1])
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execute([qc1, qc2], BasicAer.get_backend('qasm_simulator'))
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if __name__ == '__main__':
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main()
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if errors are encountered with Python 3.8 on MacOS.
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deprecations:
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- |
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Python 3.5 support in qiskit-terra is deprecated. Support will be
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removed on the upstream python community's end of life date for the version,
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which is 09/13/2020.
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