mirror of https://github.com/Qiskit/qiskit.git
58 lines
2.1 KiB
YAML
58 lines
2.1 KiB
YAML
---
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upgrade:
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- |
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The ``qiskit.Aer`` and ``qiskit.IBMQ`` top level attributes are now lazy
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loaded. This means that the objects will now always exist and warnings will
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no longer be raised on import if ``qiskit-aer`` or ``qiskit-ibmq-provider``
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are not installed (or can't be found by Python). If you were checking for
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the presence of ``qiskit-aer`` or ``qiskit-ibmq-provider`` using these
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module attributes and explicitly comparing to ``None`` or looking for the
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absence of the attribute this no longer will work because they are always
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defined as an object now. In other words running something like::
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try:
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from qiskit import Aer
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except ImportError:
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print("Aer not available")
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or::
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try:
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from qiskit import IBMQ
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except ImportError:
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print("IBMQ not available")
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will no longer work. Instead to determine if those providers are present
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you can either explicitly use ``qiskit.providers.aer.Aer`` and
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``qiskit.providers.ibmq.IBMQ``::
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try:
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from qiskit.providers.aer import Aer
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except ImportError:
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print("Aer not available")
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try:
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from qiskit.providers.ibmq import IBMQ
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except ImportError:
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print("IBMQ not available")
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or check ``bool(qiskit.Aer)`` and ``bool(qiskit.IBMQ)`` instead, for
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example::
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import qiskit
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if not qiskit.Aer:
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print("Aer not available")
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if not qiskit.IBMQ:
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print("IBMQ not available")
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This change was necessary to avoid potential import cycle issues between
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the qiskit packages and also to improve the import time when Aer or IBMQ
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are not being used.
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- |
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The user config file option ``suppress_packaging_warnings`` option in the
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user config file and the ``QISKIT_SUPPRESS_PACKAGING_WARNINGS`` environment
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variable no longer has any effect and will be silently ignored. The warnings
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this option controlled have been removed and will no longer be emitted at
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import time from the ``qiskit`` module.
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