nocasedict
A case-insensitive list for Python
Decision gist · record as of 2026-08-14
Yes, if you need case-insensitive dictionary semantics with key-case preservation. The package is actively maintained, production-stable, has low install friction, and covers a genuine use case not well-served by existing alternatives. The LGPL-2.1-or-later license requires attention in proprietary projects but poses no barrier for open-source work.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low install friction with a single runtime dependency (typing-extensions).
- Actively maintained with recent commits and production-stable status across modern Python versions.
License · maintenance · safety
LGPL-2.1-or-later (copyleft) — Licensed under LGPL-2.1-or-later (copyleft). Derivative works and modifications must be released under compatible terms; suitable for open-source projects but requires care in proprietary contexts.
last release 2026-01-04 (222 days) · last repo commit 2026-07-20 · 4 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 107,769 downloads/mo, #12,598 on PyPI
Alternatives
Verify before relying
pip install nocasedict
from nocasedict import NocaseDict
dict1 = NocaseDict({'Alpha': 1, 'Beta': 2})
print(dict1['ALPHA']) # Returns 1
print(dict1) # Prints NocaseDict({'Alpha': 1, 'Beta': 2})- Performance characteristics compared to standard dict for large datasets
- Behavior when keys differ only in case (e.g., 'Alpha' vs 'ALPHA' as separate inserts)
What it is and what it does
NocaseDict is an ordered dictionary implementation that performs case-insensitive key lookups while preserving the original lexical case of keys as they were inserted. When you access a key, the lookup is case-insensitive (so 'ALPHA', 'alpha', and 'Alpha' all retrieve the same value), but when you print or iterate the dictionary, keys appear in their original form.
The package implements the full Python 3.14 dict API on all supported Python versions (3.9+), with customizable casefolding behavior via str.casefold() for unicode strings and bytes.lower() for byte strings by default. It also provides mixin classes for adding hashability and attribute-based key access, making it suitable for scenarios where case-insensitive matching is needed without sacrificing the ability to preserve the original key format.
Use it for
- HTTP header handling where header names are case-insensitive but original casing should be preserved in responses
- Configuration file parsing where option names are matched case-insensitively but displayed in their original form
- API parameter matching where user input may vary in case but should map to canonical keys
- Database column name lookups where case-insensitive matching is needed but original column names must be retained
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need case-insensitive dictionary semantics with key-case preservation.
The package is actively maintained, production-stable, has low install friction, and covers a genuine use case not well-served by existing alternatives. The LGPL-2.1-or-later license requires attention in proprietary projects but poses no barrier for open-source work.
Install
nocasedict on PyPI
Before you install
Low install friction with a single runtime dependency (typing-extensions). Actively maintained with recent commits and production-stable status across modern Python versions.
License in practice
Licensed under LGPL-2.1-or-later (copyleft). Derivative works and modifications must be released under compatible terms; suitable for open-source projects but requires care in proprietary contexts.
Quickstart
pip install nocasedict
from nocasedict import NocaseDict
dict1 = NocaseDict({'Alpha': 1, 'Beta': 2})
print(dict1['ALPHA']) # Returns 1
print(dict1) # Prints NocaseDict({'Alpha': 1, 'Beta': 2})Verify before relying
- Performance characteristics compared to standard dict for large datasets
- Behavior when keys differ only in case (e.g., 'Alpha' vs 'ALPHA' as separate inserts)
Package facts
| License | LGPL-2.1-or-later copyleft |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagetyping-extensions |
| Maintenance | Actively maintained 222 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 107,769 / month, #12,598 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries :: Python Modules |
Evidence: nocasedict-2.2.0-py3-none-any.whl
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