loman

library0.6.0pypypi✓ verified 85d ago

Loman tracks the state of computations and the dependencies between them, enabling full and partial recalculations. It provides a directed acyclic graph (DAG) of computations with caching, error handling, and serialization support. Current version is 0.6.0, released in April 2026. Release cadence is approximately monthly.

workflow serialization

pip install loman

github ↗package ↗

INSTALL

IMPORT

SIG · LOMAN

loman

workflowpythonv0.6.0

Install

13.6s avg

Import

1912ms

Disk

274MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.5.3 · 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 1.992s · 269MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 13.6s · import 1.832s · 258MB

274MB installed

● package 274MB

Code

Verified usage

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

Computation

✓ from loman import Computation

ComputationNode

✓ from loman import ComputationNode

Define a simple computation graph with two nodes and run it.

from loman import Computation # Create a computation graph comp = Computation() # Define nodes (computations) @comp.node('a') def compute_a(): return 1 @comp.node('b', depends_on=['a']) def compute_b(a): return a + 2 # Run the computation comp.compute_all() print(comp.get_value('b')) # Output: 3

Debug

Known issues

breakingIn version 0.6.0, the dill dependency was removed, and serialization now uses Python's built-in pickle. Custom serialization logic may break if it relied on dill.

fix

Replace any usage of dill-specific serialization with standard pickle or check your serialization hooks.

affects: >=0.6.0

gotchaNode functions must not have side effects on mutable global state, or caching may produce unexpected results. Loman caches results by default, so if a node modifies an external list, partial recomputations will not re-trigger that side effect.

fix

Ensure node functions are pure (no side effects) or use the 'always_recompute' parameter.

affects: all

deprecatedThe 'compute_and_get_value' method is deprecated as of version 0.5.4. It may be removed in a future release.

fix

Use 'compute_all' then 'get_value' instead.

affects: >=0.5.4

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'dill'

dill was removed as a dependency in loman 0.6.0.

fix

Upgrade to loman 0.6.0 or later, and ensure your code does not import dill. If you need dill, install it separately: pip install dill

KeyError: 'node_name'

Trying to get the value of a node that hasn't been computed yet or doesn't exist.

fix

Ensure the node is defined and computed: call comp.compute_all() or compute the specific node before calling get_value('node_name').

Upgrade

Version history

0.6.0latest on PyPI · released Apr 26, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

11 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/janusassetallocation/loman ↗

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