islpy

library2026.1pypypi✓ verified 84d ago

Python wrapper around the Integer Set Library (isl), providing operations on integer sets, relations, and affine constraints. Current version 2026.1, released on a rolling basis with no fixed cadence.

data

pip install islpy

github ↗package ↗docs ↗

INSTALL

IMPORT

SIG · ISLPY

islpy

datapythonv2026.1

Install

1.7s avg

Import

157ms

Disk

25MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v2026.1 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.166s · 27.9MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.7s · import 0.148s · 27MB

25MB installed

● package 25MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

islpy

✓ import islpy

Direct import is the standard and only supported pattern.

Basic usage showing creation of integer sets and intersection.

import islpy as isl # Create a basic set: all integer pairs (x, y) with x + y <= 5 s1 = isl.BasicSet('[n] -> { [x, y] : x + y <= n }') print(s1) # Create a second set s2 = isl.BasicSet('[n] -> { [x, y] : x >= 0 and y >= 0 }') # Intersection intersection = s1.intersect(s2) print(intersection) # Check if non-empty print(f"Is empty? {intersection.is_empty()}")

Debug

Known issues

breakingPython 3.10 minimum required; islpy dropped support for Python <3.10 in version 2024.x. Attempting to install on older Python will fail.

fix

Upgrade to Python 3.10 or later.

affects: >=2024.0

gotchaString-based set representation uses isl's syntax, which can be confusing. Misplacing brackets or missing dimensions leads to errors.

fix

Use islpy parsing helpers like isl.BasicSet.read_from_str or carefully double-check syntax.

affects: all

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'islpy'

islpy not installed in the current Python environment.

fix

Run: pip install islpy

ValueError: could not create isl_basic_set: invalid input

The string representation for a set or relation is malformed.

fix

Ensure the string follows isl syntax. For example: '{ [x] : x >= 0 }' or '[n] -> { [x] : x <= n }'.

Upgrade

Version history

2026.1latest on PyPI · released Jan 27, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

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Resources

githubhttps://github.com/inducer/islpy ↗

packagehttps://pypi.org/project/islpy/ ↗

docshttps://documen.tician.de/islpy ↗