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@MichaelBroughton MichaelBroughton commented Jan 20, 2022

Resolves #4856 .

qcs_notebook fxn now returns a Sycamore device which feels like "more correct" behavior.

BREAKING_CHANGE=Json and repr files were removed for these objects since it looks like they were never really needed.

The Foxtail and Bristlecone objects were just static singleton datastores we had in the library itself - in their current form there would never be any need to serialize them. Plus working in the deserialization of global singletons to avoid some warnings isn't something that seemed worth doing for this removal.

xref #4744

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Looks good overall. Left a few minor comments. Will approve once they are fixed.


_register_resolver(_class_resolver_dictionary)

__spec_copy__ = sys.modules[__name__].__spec__
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Why do we need to explicitly copy the spec and then pass it to deprecate_attributes ? Can't we just do:

sys.modules[__name__] = _compat.deprecate_attributes(
    sys.modules[__name__],
    {
        'Bristlecone': ('v0.15', 'Bristlecone will no longer be supported.'),
        'Foxtail': ('v0.15', 'Foxtail will no longer be supported.'),
    },
)

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for some reason this update clobbers the spec entry in sys.modules I'm not a python wizard, but this worked well enough. So it is needed.



def test_init():
@mock.patch.dict(os.environ, clear='CIRQ_TESTING')
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You can just add a ALLOW_DEPRECATION_IN_TEST = 'ALLOW_DEPRECATION_IN_TEST' at the beginning of the file instead of adding a patch to each individual test

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Try as I might I couldn't get this for some reason or other, so I just left as mocks.

@MichaelBroughton MichaelBroughton added the automerge Tells CirqBot to sync and merge this PR. (If it's running.) label Jan 21, 2022
@CirqBot CirqBot added the front_of_queue_automerge CirqBot uses this label to indicate (and remember) what's being merged next. label Jan 21, 2022
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CirqBot commented Jan 21, 2022

Automerge cancelled: A status check is failing.

@CirqBot CirqBot removed automerge Tells CirqBot to sync and merge this PR. (If it's running.) front_of_queue_automerge CirqBot uses this label to indicate (and remember) what's being merged next. labels Jan 21, 2022
@tanujkhattar tanujkhattar merged commit ee9bd68 into quantumlib:master Jan 21, 2022
@MichaelBroughton MichaelBroughton deleted the dep_xmon branch January 21, 2022 03:56
MichaelBroughton added a commit to MichaelBroughton/Cirq that referenced this pull request Jan 22, 2022
* Deprecate XmonDevice, Foxtail and Bristlecone.

* Tanuj feedback.

Co-authored-by: Cirq Bot <craiggidney+github+cirqbot@google.com>
rht pushed a commit to rht/Cirq that referenced this pull request May 1, 2023
* Deprecate XmonDevice, Foxtail and Bristlecone.

* Tanuj feedback.

Co-authored-by: Cirq Bot <craiggidney+github+cirqbot@google.com>
harry-phasecraft pushed a commit to PhaseCraft/Cirq that referenced this pull request Oct 31, 2024
* Deprecate XmonDevice, Foxtail and Bristlecone.

* Tanuj feedback.

Co-authored-by: Cirq Bot <craiggidney+github+cirqbot@google.com>
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[cirq-google] Proposal: Remove XmonDevice, Bristlecone, Foxtail and rename optimize_for_xmon.

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