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frigid

Immutable data structures.

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                                 frigid

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šŸ”’ A Python library package which provides immutable data structures - collections which cannot be modified after creation.

Key Features ⭐

  • šŸ“– Immutable Dictionary: Like a regular dict <https://docs.python.org/3/library/stdtypes.html#dict>, but entries cannot be modified or removed. Also has variant for validation on initialization. And provides set operations not found on MappingProxyType <https://docs.python.org/3/library/types.html#types.MappingProxyType>.
  • šŸ—ƒļø Immutable Namespace: Similar to SimpleNamespace <https://docs.python.org/3/library/types.html#types.SimpleNamespace>_, but attributes are immutable from creation.
  • 🧱 Additional Types: Classes (including abstract base classes), modules, and objects with immutable behavior.
  • šŸ—ļø Flexible Initialization: Support for unprotected attributes during initialization; useful for compatibility with class decorators, such as dataclasses <https://docs.python.org/3/library/dataclasses.html#dataclasses.dataclass>_.
  • šŸ”“ Flexible Mutability: Support for declaring specific attributes as mutable, enabling selective modification while maintaining immutability for other attributes.

Installation šŸ“¦

::

pip install frigid

Note on Immutability šŸ“¢

Enforcement of immutability is quite difficult in Python. While this library enforces immutability by default, it can be circumvented by anyone who has intermediate knowledge of Python machinery and who is determined to circumvent the immutability. Use the library in the spirit of making programs safer, but understand that it cannot truly prevent unwanted state tampering.

Examples šŸ’”

Immutable Namespaces šŸ—ƒļø

An immutable namespace, similar to types.SimpleNamespace, is available. This namespace can be initialized from multiple iterables and from keyword arguments. (Keyword arguments shown below; see documentation for additional forms of initialization.)

from frigid import Namespace ns = Namespace( apples = 12, bananas = 6 ) ns.cherries = 42 # āŒ Attempted assignment raises error. Traceback (most recent call last): ... frigid.exceptions.AttributeImmutability: Could not assign or delete attribute 'cherries'. del ns.apples # āŒ Attempted deletion raises error. Traceback (most recent call last): ... frigid.exceptions.AttributeImmutability: Could not assign or delete attribute 'apples'. ns frigid.namespaces.Namespace( apples = 12, bananas = 6 )

Immutable Dictionaries šŸ“–

An immutable dictionary, similar to dict, is available. This dictionary can be initialized from multiple iterables and from keyword arguments. (Keyword arguments shown below; see documentation for additional forms of initialization.)

from frigid import Dictionary dct = Dictionary( apples = 12, bananas = 6) dct['cherries'] = 42 # āŒ Attempted assignment raises error. Traceback (most recent call last): ... frigid.exceptions.EntryImmutability: Cannot assign entry for 'cherries'. del dct['bananas'] # āŒ Attempted removal raises error. Traceback (most recent call last): ... frigid.exceptions.EntryImmutability: Cannot delete entry for 'bananas'. dct frigid.dictionaries.Dictionary( {'apples': 12, 'bananas': 6} )

Immutable Objects 🧱

The with_standard_behaviors decorator can be applied to any class to make its instances fully immutable after initialization.

from frigid import with_standard_behaviors @with_standard_behaviors( ) ... class Config: ... def init( self, debug = False ): ... self.debug = debug ... config = Config( debug = True ) config.verbose = True # āŒ Attempted addition raises error Traceback (most recent call last): ... frigid.exceptions.AttributeImmutability: Could not assign or delete attribute 'verbose'. config.debug = False # āŒ Attempted reassignment raises error Traceback (most recent call last): ... frigid.exceptions.AttributeImmutability: Could not assign or delete attribute 'debug'.

Use Cases šŸŽÆ

  • šŸ”’ Configuration Objects: Objects which must maintain consistent state throughout program execution.
  • šŸ“Š Value Objects: Objects which represent values and should be immutable, like numbers or strings.
  • 🧱 Immutable Collections: Many scenarios requiring collections with complete immutability guarantees.

More Flair <https://www.imdb.com/title/tt0151804/characters/nm0431918>_

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Other Projects by This Author 🌟

  • python-absence <https://github.com/emcd/python-absence>_ (absence <https://pypi.org/project/absence/>_ on PyPI)

    šŸ•³ļø A Python library package which provides a sentinel for absent values - a falsey, immutable singleton that represents the absence of a value in contexts where None or False may be valid values.

  • python-accretive <https://github.com/emcd/python-accretive>_ (accretive <https://pypi.org/project/accretive/>_ on PyPI)

    🌌 A Python library package which provides accretive data structures - collections which can grow but never shrink.

  • python-classcore <https://github.com/emcd/python-classcore>_ (classcore <https://pypi.org/project/classcore/>_ on PyPI)

    šŸ­ A Python library package which provides foundational class factories and decorators for providing classes with attributes immutability and concealment and other custom behaviors.

  • python-dynadoc <https://github.com/emcd/python-dynadoc>_ (dynadoc <https://pypi.org/project/dynadoc/>_ on PyPI)

    šŸ“ A Python library package which bridges the gap between rich annotations and automatic documentation generation with configurable renderers and support for reusable fragments.

  • python-falsifier <https://github.com/emcd/python-falsifier>_ (falsifier <https://pypi.org/project/falsifier/>_ on PyPI)

    šŸŽ­ A very simple Python library package which provides a base class for falsey objects - objects that evaluate to False in boolean contexts.

  • python-icecream-truck <https://github.com/emcd/python-icecream-truck>_ (icecream-truck <https://pypi.org/project/icecream-truck/>_ on PyPI)

    šŸ¦ Flavorful Debugging - A Python library which enhances the powerful and well-known icecream package with flavored traces, configuration hierarchies, customized outputs, ready-made recipes, and more.

  • python-mimeogram <https://github.com/emcd/python-mimeogram>_ (mimeogram <https://pypi.org/project/mimeogram/>_ on PyPI)

    šŸ“Ø A command-line tool for exchanging collections of files with Large Language Models - bundle multiple files into a single clipboard-ready document while preserving directory structure and metadata... good for code reviews, project sharing, and LLM interactions.

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