pyomo-pounce

Pyomo solver plugin for POUNCE, a pure-Rust interior-point NLP solver (a Rust port of IPOPT).

POUNCE speaks the AMPL NL/SOL protocol, so Pyomo drives it through the AMPL Solver Library interface — exactly how Pyomo integrates with IPOPT.

Installation

pip install pyomo-pounce

That single command pulls in the pounce-solver dependency, which ships a per-platform wheel bundling the pounce executable. After install, pounce is on your PATH and Pyomo finds it automatically.

Usage

import pyomo_pounce  # registers the solver — REQUIRED before SolverFactory('pounce')
from pyomo.environ import *

model = ConcreteModel()
model.x = Var(initialize=0.5)
model.obj = Objective(expr=(model.x - 2)**2)

solver = SolverFactory('pounce')
result = solver.solve(model, tee=True)
print(f"x* = {value(model.x)}")  # 2.0

import pyomo_pounce is required. Without it, SolverFactory('pounce') raises a clear UnknownSolver / "plugin not registered" error — it does not silently run some other pounce. With it imported, the plugin runs the pounce binary bundled in the pounce-solver wheel, independent of PATH. Only a source/dev install without that wheel falls back to a pounce on PATH, in which case the plugin warns.

To see exactly which binary will run (and whether a stale or unrelated pounce earlier on PATH would shadow it), call:
import pyomo_pounce
pyomo_pounce.check_binary()
The check compares the git commit embedded in pounce --about, not the version string — two builds can share the same X.Y.Z while differing in behavior (as a binary from before/after a fix does).

Solver Options

Pass options the same way as IPOPT:

solver = SolverFactory('pounce')
solver.options['max_iter'] = 1000
solver.options['tol'] = 1e-10
solver.options['print_level'] = 5

Options are forwarded to POUNCE's OptionsList (ipopt.opt-compatible keys).

Local development / unsupported platforms

If pounce-solver does not ship a wheel for your platform, the pip install fails on the dependency. Two workarounds:

Build POUNCE from source and put it on PATH — the plugin resolves pounce via shutil.which, so any binary on PATH works:

# in the pounce repo
cargo build --release --bin pounce
export PATH="$PWD/target/release:$PATH"
pip install --no-deps pyomo-pounce pyomo

Install pounce-solver from source via maturin:

cd pounce/python && maturin develop --release
# then `cargo install --path ../crates/pounce-cli` to get the CLI
# since maturin develop does not bundle the binary.
pip install pyomo-pounce

License

EPL-2.0, same as POUNCE.

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

pyomo_pounce-0.9.0.tar.gz (57.3 kB view details)

Uploaded Jul 24, 2026 Source

Built Distribution

If you're not sure about the file name format, learn more about wheel file names.

The dropdown lists show the available interpreters, ABIs, and platforms. Enable javascript to be able to filter the list of wheel files.

pyomo_pounce-0.9.0-py3-none-any.whl (40.5 kB view details)

Uploaded Jul 24, 2026 Python 3

File details

Details for the file pyomo_pounce-0.9.0.tar.gz.

File metadata

Download URL: pyomo_pounce-0.9.0.tar.gz
Upload date: Jul 24, 2026
Size: 57.3 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/6.1.0 CPython/3.13.14

File hashes

Hashes for pyomo_pounce-0.9.0.tar.gz
Algorithm	Hash digest
SHA256	`e18bd962ce2094c9796fc3ea807dbebea29b77947d59f42378fc1556fc47bde6`
MD5	`1c7fdd54b1676ba74178c9179dff8978`
BLAKE2b-256	`ffe97ce90951ebcadb900f2046953c939f0a2182cb630357013ddcb307daccd0`

See more details on using hashes here.

Provenance

The following attestation bundles were made for pyomo_pounce-0.9.0.tar.gz:

Publisher: release-pyomo-pounce.yml on jkitchin/pounce

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: pyomo_pounce-0.9.0.tar.gz
- Subject digest: e18bd962ce2094c9796fc3ea807dbebea29b77947d59f42378fc1556fc47bde6
- Sigstore transparency entry: 2236116669
- Sigstore integration time: Jul 24, 2026
Source repository:
- Permalink: jkitchin/pounce@2bfda1fa07e94ef1839358cd00cef688b2dc403f
- Branch / Tag: refs/tags/pyomo-pounce-v0.9.0
- Owner: https://github.com/jkitchin
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release-pyomo-pounce.yml@2bfda1fa07e94ef1839358cd00cef688b2dc403f
- Trigger Event: push