atlas-chai
Python bindings for CHAI (Conditions High-level Application Interface), the ATLAS library for reading and writing conditions data. One API covers several backends, each a plugin selected by the connection string's scheme:
| Scheme | Backend |
|---|---|
crest: |
A CREST server, e.g. crest:https://crest.cern.ch/api-v6.0 |
crest_fs: |
CREST's on-disk format in a local directory |
coolr: |
Legacy COOL data through the COOLR REST service (read-only) |
Install
python3.12 -m venv ~/chai-env
~/chai-env/bin/pip install atlas-chai
| Platform | Status |
|---|---|
| Linux x86_64 (glibc 2.28+, e.g. EL8/EL9, Ubuntu 20.04+), CPython 3.12 and newer | One cp312-abi3 wheel per release |
| macOS | Not on PyPI yet; build a wheel locally |
Free-threaded CPython (3.13t, 3.14t) |
Not supported |
The import name is chai. Releases up to 2.6.0 were published only to the GitLab Package Registry, as chai-db; uninstall that first if you have it.
Example
Write one payload to a local crest_fs directory and read it back:
import chai
db = chai.Database("crest_fs:/tmp/chai-demo")
spec = chai.PayloadSpec(chai.FieldSpec([chai.Field("hv", chai.Type.Float)]),
chai.ChannelSpec([chai.Channel(0, "barrel")]))
tag = db.create_tag("DemoTag", "Example tag", spec)
payload = tag.build_container()
payload[0]["hv"] = 1500.0
tag.add_payload(payload, since=0)
print(tag.get_payload_at(42).payload.get(0, "hv")) # 1500.0
Documentation
1 maintainer
Metadata
1 maintainer
Release files for atlas-chai 2.7.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Actions Reset |
|---|---|---|---|---|
| atlas_chai-2.7.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl | CPython 3.12 | abi3 | Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64 | Details for atlas_chai-2.7.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl |
Release files / atlas_chai-2.7.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
| Download URL | atlas_chai-2.7.0-cp312-abi3-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl |
|---|---|
| Size | 6.1 MB |
| Tags | CPython 3.12 Linux glibc 2.27+ x86-64 Linux glibc 2.28+ x86-64 abi3 |
|
SHA-256 checksum How to use checksums |
8d95ed2022fbe1c9d9f9a6b3cf1d96ad89ede9e78aeafa5889419d71cdf44cf4
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| Upload date | |
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Uploaded using Trusted Publishing? What is trusted publishing? |
No |
| Uploaded via |
twine/7.0.0 CPython/3.12.16
|
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