retp (Python)
An ETP v1.2 client for Python, over the Rust
retp stack: open a session with an ETP server, list its dataspaces and
resources, read and write EnergyML objects, read data arrays into numpy.
import retp
with retp.connect("wss://etp.example.org/", token=token) as session:
for space in session.dataspaces():
print(space["path"], space["uri"])
listed = session.resources("demo")
objects, errors = session.get_objects([r["uri"] for r in listed["resources"]])
values, dimensions = session.read_array(uri, "/RESQML/.../points")
points = values.reshape(dimensions)
It is only a bridge. Every operation is a call into the Rust library
(retp-client, energyml-etp-store); the Python layer converts arguments and
results and carries no feature the Rust library does not have. What Python
needs and Rust lacks is added in Rust first.
Objects are dictionaries, in the EnergyML JSON encoding: every node carries
its $type. No generated classes. This is the same convention as
energyml-rust's Python bridge (energyml.rust), so an object read here can be
put there, and the other way round.
Arrays are numpy arrays, copied out of the Rust buffer, flat and row-major, with the dimensions beside them.
A failure is named. Exceptions derive from retp.RetpError and tell apart
what a caller does differently: reconnect (ConnectionLost), log in again
(AuthorizationNeeded), check before retrying a write (OutcomeUnknown), give
up on a feature (Unsupported). A call never returns an empty result to mean
"not supported".
The token is never stored: it is handed to the Rust client and is in no
repr, no attribute and no error message.
Status: first draft, alpha. See DESIGN.md for the scope, the decisions still
open, and what the Rust API must grow before the bridge
can offer more. See ARCHITECTURE.md for why the code is shaped as it is, and
docs/python.md (at the root of the repository) for the user guide.
Install
pip install retp
TODO(verify): not published to PyPI yet. From a checkout of the repository
(needs the HDF5 C library, or add hdf5-static to the features for CMake and a
C compiler instead):
pip install maturin
cd crates/retp-python
maturin develop
License
Apache-2.0.
1 maintainer
Metadata
1 maintainer
Release files for retp 0.2.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
|---|---|---|---|---|
| retp-0.2.0.tar.gz | 357.0 kB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| retp-0.2.0-cp39-abi3-win_arm64.whl | CPython 3.9 | abi3 | Windows ARM64 | Details |
| retp-0.2.0-cp39-abi3-win_amd64.whl | CPython 3.9 | abi3 | Windows x86-64 | Details |
| retp-0.2.0-cp39-abi3-musllinux_1_2_x86_64.whl | CPython 3.9 | abi3 | Linux musl 1.2+ x86-64 | Details |
| retp-0.2.0-cp39-abi3-musllinux_1_2_aarch64.whl | CPython 3.9 | abi3 | Linux musl 1.2+ ARM64 | Details |
| retp-0.2.0-cp39-abi3-manylinux_2_28_x86_64.whl | CPython 3.9 | abi3 | Linux glibc 2.28+ x86-64 | Details |
| retp-0.2.0-cp39-abi3-manylinux_2_28_aarch64.whl | CPython 3.9 | abi3 | Linux glibc 2.28+ ARM64 | Details |
| retp-0.2.0-cp39-abi3-macosx_11_0_arm64.whl | CPython 3.9 | abi3 | macOS 11.0+ ARM64 | Details |
| retp-0.2.0-cp39-abi3-macosx_10_12_x86_64.whl | CPython 3.9 | abi3 | macOS 10.12+ x86-64 | Details |
Total release size: 373.7 MB
Release files / retp-0.2.0.tar.gz
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