lemminflect

library0.2.3pypypi✓ verified 84d ago

A Python module for English lemmatization and inflection (generating inflected forms from lemmas). It provides a lookup-based and rule-based approach for verbs, nouns, adjectives, and adverbs. Current version: 0.2.3 (last release April 2022). Release cadence is low.

ai-ml data

pip install lemminflect

github ↗package ↗

INSTALL

IMPORT

SIG · LEMMINFLECT

lemminflect

ai-mlpythonv0.2.3

Install

3.8s avg

Import

294ms

Disk

90MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.2.3 · 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 0.282s · 90.4MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 3.8s · import 0.306s · 87MB

90MB installed

● package 90MB

Code

Verified usage

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

getLemma

✓ from lemminflect import getLemma

Direct import of the lemmatization function.

getInflection

✓ from lemminflect import getInflection

Direct import of the inflection function.

getAllInflections

✓ from lemminflect import getAllInflections

Import all inflections (returns dict of all forms).

getAllLemmas

✓ from lemminflect import getAllLemmas

Import all lemmas (returns dict of all lemma forms).

isTagBaseForm

✓ from lemminflect import isTagBaseForm

Check if a tag corresponds to the base form of a word.

Basic lemmatization and inflection using Penn Treebank POS tags.

from lemminflect import getLemma, getInflection # Lemmatize a word lemma = getLemma('flies', 'VERB') print(f"Lemma: {lemma}") # Output: 'fly' # Inflect a lemma to a specific form inflected = getInflection('fly', 'VBD') print(f"Inflected: {inflected}") # Output: ('flew',) # Note: POS tags are Penn Treebank-like (NN, VB, JJ, etc.)

Debug

Known issues

gotchaPOS tags must be in Penn Treebank format (e.g., 'VB', 'VBD', 'NN', 'JJ', etc.) not Universal Dependencies. Using wrong tags returns empty results silently.

fix

Use PTB tags: VB (verb base), VBD (past), VBG (gerund), VBN (past participle), VBP (present non-3rd), VBZ (present 3rd), NN (noun), NNS (plural noun), JJ (adjective), JJR (comparative), JJS (superlative), RB (adverb), RBR (comparative adverb), RBS (superlative adverb).

affects: all

gotchaThe function returns an empty list/tuple if the word is unknown or the lemma cannot be found. It does not raise exceptions.

fix

Always check the return value: e.g., result = getLemma('word', 'NN'); if result: ... else: handle unknown.

affects: all

deprecatedThe module is not actively maintained; last release 0.2.3 was in 2022. No support for newer spaCy versions or Python 3.12+ out of the box.

fix

Consider using spaCy's built-in lemmatizer or the 'simplemma' library for active development.

affects: 0.2.3

Errors

Common errors & fixes

lemminflect doesn't handle 'ran' as past tense of 'run'

LemmInflect relies heavily on a lookup dictionary. Some irregular forms may be missing or have gaps.

fix

Use fallback to a rule-based lemmatizer (e.g., NLTK's WordNetLemmatizer) or add custom mappings.

getInflection('fly', 'VBD') returns an empty tuple

The word lemma 'fly' is stored but the past tense form 'flew' might be missing from the inflections dictionary in some cases.

fix

Check if the lemma exists: getLemma('fly', 'VB') should return 'fly'. Then try getInflection with the correct lemma. If still empty, consider using getAllInflections('fly') to see all known forms.

Upgrade

Version history

0.2.3latest on PyPI · released Oct 2, 2022

Audit

Dependencies

numpyoptionalUsed internally for array operations; may be optional in future builds.

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/bjascob/LemmInflect ↗

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