.. # ------------------( LICENSE )------------------ .. # Copyright (c) 2014-2026 Beartype authors. .. # See "LICENSE" for further details. .. # .. # ------------------( SEO )------------------ .. # Metadata converted into HTML-specific meta tags parsed by search engines. .. # Note that: .. # * The "description" should be no more than 300 characters and ideally no .. # more than 150 characters, as search engines may silently truncate this .. # description to 150 characters in edge cases.
.. meta:: :description lang=en: Beartype is an open-source pure-Python PEP-compliant constant-time runtime type checker emphasizing efficiency and portability.
.. # ------------------( SYNOPSIS )------------------
================= |beartype-banner| =================
|rtd-badge| |ci-badge| |codecov-badge|
⚠
Beartype documentation lives at ReadTheDocs (RTD) __. It's
readable, structured, and soothing to the deep folds of your big galactic
brain. Open your mind to an ocean of mundane knowledge that will exhaust
you at work. Enter... the Bearpedia:
https://beartype.readthedocs.io
The document you are now reading was once a monolithic ~316Kb file known to induce migraines in 22% of the whole devops population. For your safety, that document no longer exists. This is how much beartype cares.
Beartype is an open-source __ pure-Python __ PEP-compliant __ near-real-time __
hybrid runtime-static __ third-generation __ type checker __ emphasizing efficiency,
usability, unsubstantiated jargon we just made up, and thrilling puns.
.. #FIXME: Once we actually receive a sponsor at this tier, please remove this
.. #placeholder as well as the icon links below. kthx
.. #The Bear Team __ gratefully thanks our family of
.. #breathtaking GitHub Sponsors __:
.. #
.. #* Your iconic URL here. Let us bestow you with eyeballs __.
.. #FIXME: Once we actually receive a sponsor at this tier, please remove this
.. #placeholder as well as the icon links below. kthx
.. # |icon-for-glorious-sponsor|
.. code-block:: bash
# Install beartype. $ pip install beartype
# Edit the "{your_package}.__init__" submodule with your favourite IDE. $ vim {your_package}/__init__.py # <-- so, i see that you too vim
.. code-block:: python
from beartype.claw import beartype_this_package # <-- hype comes beartype_this_package() # <-- hype goes
Beartype now implicitly type-checks all annotated classes, callables, and variable assignments across all submodules of your package. Congrats. This day all bugs die.
But why stop at the burning tires in only your code? Your app depends on a sprawling ghetto of other packages, modules, and services. How riddled with infectious diseases is that code? You're about to find out.
.. code-block:: python
# ....................{ BIG BEAR }.................... # Warn about type hint violations in OTHER packages outside your control; # only raise exceptions from violations in your package under your control. # Again, at the very top of your "{your_package}.__init__" submodule: from beartype import BeartypeConf # <-- this isn't your fault from beartype.claw import beartype_all, beartype_this_package # <-- you didn't sign up for this beartype_this_package() # <-- raise exceptions in your code beartype_all(conf=BeartypeConf(violation_type=UserWarning)) # <-- emit warnings from other code
Beartype now implicitly type-checks all annotated classes, callables, and variable assignments across all submodules of all packages. When your package violates type safety, beartype raises an exception. When any other package violates type safety, beartype just emits a warning. The triumphal fanfare you hear is probably your userbase cheering. This is how the QA was won.
Beartype also publishes a plethora of APIs for fine-grained control over
type-checking . For those who are about to QA, beartype salutes
you. Would you like to know more?
# So let's do this. $ python3
.. code-block:: python
# ....................{ RAISE THE PAW }.................... # Manually enforce type hints across individual classes and callables. # Do this only if you want a(nother) repetitive stress injury.
# Import the @beartype decorator. >>> from beartype import beartype # <-- eponymous import; it's eponymous
# Annotate @beartype-decorated classes and callables with type hints. >>> @beartype # <-- you too will believe in magic ... def quote_wiggum(lines: list[str]) -> None: ... print('“{}”\n\t— Police Chief Wiggum'.format("\n ".join(lines)))
# Call those callables with valid parameters. >>> quote_wiggum(["Okay, folks. Show's over!", " Nothing to see here. Show's…",]) “Okay, folks. Show's over! Nothing to see here. Show's…” — Police Chief Wiggum
# Call those callables with invalid parameters.
>>> quote_wiggum([b"Oh, my God! A horrible plane crash!", b"Hey, everybody! Get a load of this flaming wreckage!",])
Traceback (most recent call last):
File "
# ....................{ MAKE IT SO }.................... # Squash bugs by refining type hints with @beartype validators. >>> from beartype.vale import Is # <---- validator factory >>> from typing import Annotated # <---------------- if Python ≥ 3.9.0 # >>> from typing_extensions import Annotated # <-- if Python < 3.9.0
# Validators are type hints constrained by lambda functions. >>> ListOfStrings = Annotated[ # <----- type hint matching non-empty list of strings ... list[str], # <----------------- type hint matching possibly empty list of strings ... Is[lambda lst: bool(lst)] # <-- lambda matching non-empty object ... ]
# Annotate @beartype-decorated callables with validators. >>> @beartype ... def quote_wiggum_safer(lines: ListOfStrings) -> None: ... print('“{}”\n\t— Police Chief Wiggum'.format("\n ".join(lines)))
# Call those callables with invalid parameters. >>> quote_wiggum_safer([]) beartype.roar.BeartypeCallHintParamViolation: @beartyped quote_wiggum_safer() parameter lines=[] violates type hint typing.Annotated[list[str], Is[lambda lst: bool(lst)]], as value [] violates validator Is[lambda lst: bool(lst)].
# ....................{ AT ANY TIME }.................... # Type-check anything against any type hint – anywhere at anytime. >>> from beartype.door import ( ... is_bearable, # <-------- like "isinstance(...)" ... die_if_unbearable, # <-- like "assert isinstance(...)" ... ) >>> is_bearable(['The', 'goggles', 'do', 'nothing.'], list[str]) True >>> die_if_unbearable([0xCAFEBEEF, 0x8BADF00D], ListOfStrings) beartype.roar.BeartypeDoorHintViolation: Object [3405692655, 2343432205] violates type hint typing.Annotated[list[str], Is[lambda lst: bool(lst)]], as list index 0 item 3405692655 not instance of str.
# ....................{ GO TO PLAID }.................... # Type-check anything in around 1µs (one millionth of a second) – including # this list of one million 2-tuples of NumPy arrays. >>> from beartype.door import is_bearable >>> from numpy import array, ndarray >>> data = [(array(i), array(i)) for i in range(1000000)] >>> %time is_bearable(data, list[tuple[ndarray, ndarray]]) CPU times: user 31 µs, sys: 2 µs, total: 33 µs Wall time: 36.7 µs True
# ....................{ MAKE US DO IT }.................... # Don't know type hints? Do but wish you didn't? What if somebody else could # write your type hints for you? @beartype: it's somebody. Let BeartypeAI™ # write your type hints for you. When you no longer care, call BeartypeAI™. >>> from beartype.bite import infer_hint # <----- caring begins
# What type hint describes the root state of a Pygments lexer, BeartypeAI™? >>> from pygments.lexers import PythonLexer >>> infer_hint(PythonLexer().tokens["root"]) list[ tuple[str | pygments.token._TokenType[str], ...] | tuple[str | collections.abc.Callable[ typing.Concatenate[object, object, ...], object], ...] | typing.Annotated[ collections.abc.Collection[str], beartype.vale.IsInstance[pygments.lexer.include]] ] # <---- caring ends
# ...all righty then. Guess I'll just take your word for that, BeartypeAI™.
Beartype brings Rust_- and C++_-inspired zero-cost abstractions __ into the lawless world of dynamically-typed_ Python by
enforcing type safety at the granular level of functions and methods __ against type hints standardized by the Python community __ in O(1) non-amortized worst-case time with negligible constant
factors __. If the prior sentence was unreadable jargon, see
our friendly and approachable FAQ for a human-readable synopsis __.
Beartype is portably implemented __ in Python 3
__, continuously stress-tested __ via GitHub
Actions_ × tox_ × pytest_ × Codecov_, and permissively
distributed __ under the MIT license_. Beartype has no
runtime dependencies, only one test-time dependency __, and only
one documentation-time dependency __. Beartype supports all actively
developed Python versions __, all Python package managers
__, and multiple platform-specific package managers
__.
.. # FIXME: Gah! Libraries.io has fallen down and cannot get back up... AGAIN.
.. # Beartype powers quality assurance across the Python ecosystem __.
.. # FIXME: Remove ALL of the following URLs except those specifically .. # required above -- which should be most of them, frankly.
.. # ------------------( IMAGES )------------------ .. |beartype-banner| image:: https://raw.githubusercontent.com/beartype/beartype-assets/main/banner/logo.svg :target: https://beartype.readthedocs.io :alt: beartype —[ the bare-metal type checker ]— .. |beartype-contributors| image:: https://contrib.rocks/image?repo=beartype/beartype :target: https://github.com/beartype/beartype/graphs/contributors :alt: Beartype contributors .. |beartype-stars| image:: https://star-history.com/#beartype/beartype&Date :target: https://github.com/beartype/beartype/stargazers :alt: Beartype stargazers
.. # ------------------( IMAGES ~ badge )------------------ .. |bear-ified| image:: https://raw.githubusercontent.com/beartype/beartype-assets/main/badge/bear-ified.svg :align: top :target: https://beartype.readthedocs.io :alt: bear-ified .. |ci-badge| image:: https://github.com/beartype/beartype/actions/workflows/python_test.yml/badge.svg :target: https://github.com/beartype/beartype/actions?workflow=tests :alt: beartype continuous integration (CI) status .. |codecov-badge| image:: https://codecov.io/gh/beartype/beartype/branch/main/graph/badge.svg?token=E6F4YSY9ZQ :target: https://codecov.io/gh/beartype/beartype :alt: beartype test coverage status .. |rtd-badge| image:: https://readthedocs.org/projects/beartype/badge/?version=latest :target: https://beartype.readthedocs.io/en/latest/?badge=latest :alt: beartype Read The Docs (RTD) status
.. # ------------------( IMAGES ~ downstream )------------------ .. # Insert links to GitHub Sponsors funding at the icon level here, please!
.. # ------------------( LINKS ~ beartype : funding )------------------ .. _BETSE: https://github.com/betsee/betse .. _BETSEE: https://github.com/betsee/betsee .. _GitHub Sponsors: https://github.com/sponsors/leycec .. _Paul Allen: https://en.wikipedia.org/wiki/Paul_Allen .. _Paul Allen Discovery Center: http://www.alleninstitute.org/what-we-do/frontiers-group/discovery-centers/allen-discovery-center-tufts-university .. _Paul Allen Discovery Center award: https://www.alleninstitute.org/what-we-do/frontiers-group/news-press/press-resources/press-releases/paul-g-allen-frontiers-group-announces-allen-discovery-center-tufts-university .. _Paul G. Allen Frontiers Group: https://www.alleninstitute.org/what-we-do/frontiers-group .. _Tufts University: https://www.tufts.edu .. _beartype sponsorship: https://github.com/sponsors/leycec
.. # ------------------( LINKS ~ beartype : local )------------------ .. _beartype license: LICENSE
.. # ------------------( LINKS ~ beartype : local : module )------------------ .. _beartype errormain: beartype/_decor/_code/_pep/_error/errormain.py .. _beartype pephint: beartype/_decor/_code/_pep/_pephint.py .. _beartype test data pep: beartype_test/unit/data/hint/pep/proposal/ .. _beartype test data pep 484: beartype_test/unit/data/hint/pep/proposal/data_hintpep484.py .. _@callable_cached: beartype/_util/cache/utilcachecall.py .. _beartype util data pep: beartype/_util/hint/data/pep/proposal/ .. _beartype util data pep parent: beartype/_util/hint/data/pep/utilhintdatapep.py .. _beartype util pep: beartype/_util/hint/pep/proposal
.. # ------------------( LINKS ~ beartype : package )------------------ .. _beartype Anaconda: https://anaconda.org/conda-forge/beartype .. _beartype Gentoo: https://github.com/leycec/raiagent .. _beartype Homebrew: https://github.com/beartype/homebrew-beartype .. _beartype MacPorts: https://ports.macports.org/port/py-beartype .. _beartype PyPI: https://pypi.org/project/beartype
.. # ------------------( LINKS ~ beartype : package : meta )------------------ .. _Libraries.io: https://libraries.io .. _beartype dependents: https://libraries.io/pypi/beartype/dependents
.. # ------------------( LINKS ~ beartype : github )------------------ .. _beartype: https://github.com/beartype/beartype .. _beartype issues: https://github.com/beartype/beartype/issues .. _beartype 1.0.0: https://github.com/beartype/beartype/issues/7 .. _beartype codebase: https://github.com/beartype/beartype/tree/main/beartype .. _beartype organization: https://github.com/beartype .. _beartype profiler: https://github.com/beartype/beartype/blob/main/bin/profile.bash .. _beartype pulls: https://github.com/beartype/beartype/pulls .. _beartype tests: https://github.com/beartype/beartype/actions?workflow=tests
.. # ------------------( LINKS ~ beartype : github : user )------------------ .. _patrick-kidger: https://github.com/patrick-kidger .. _harens: https://github.com/harens .. _leycec: https://github.com/leycec
.. # ------------------( LINKS ~ beartype : rtd )------------------ .. _beartype APIs: https://beartype.readthedocs.io/en/latest/api .. _beartype RTD: https://beartype.readthedocs.io .. _beartype ELI5: https://beartype.readthedocs.io/en/latest/eli5 .. _beartype FAQ: https://beartype.readthedocs.io/en/latest/faq .. _beartype PEPs: https://beartype.readthedocs.io/en/latest/pep .. _beartype hybrid: https://beartype.readthedocs.io/en/latest/faq/#faq-hybrid .. _beartype install: https://beartype.readthedocs.io/en/latest/install .. _beartype math: https://beartype.readthedocs.io/en/latest/math .. _beartype pure: https://beartype.readthedocs.io/en/latest/faq/#faq-pure .. _beartype third: https://beartype.readthedocs.io/en/latest/faq/#faq-third
.. # ------------------( LINKS ~ github )------------------ .. _GitHub Actions: https://github.com/features/actions .. _GitHub account signin: https://github.com/login .. _GitHub account signup: https://github.com/join .. _gitter: https://gitter.im
.. # ------------------( LINKS ~ idea )------------------ .. _Denial-of-Service: https://en.wikipedia.org/wiki/Denial-of-service_attack .. _DRY: https://en.wikipedia.org/wiki/Don%27t_repeat_yourself .. _IDE: https://en.wikipedia.org/wiki/Integrated_development_environment .. _JIT: https://en.wikipedia.org/wiki/Just-in-time_compilation .. _SQA: https://en.wikipedia.org/wiki/Software_quality_assurance .. _amortized analysis: https://en.wikipedia.org/wiki/Amortized_analysis .. _computer vision: https://en.wikipedia.org/wiki/Computer_vision .. _continuous integration: https://en.wikipedia.org/wiki/Continuous_integration .. _duck typing: https://en.wikipedia.org/wiki/Duck_typing .. _gratis versus libre: https://en.wikipedia.org/wiki/Gratis_versus_libre .. _memory safety: https://en.wikipedia.org/wiki/Memory_safety .. _multiple dispatch: https://en.wikipedia.org/wiki/Multiple_dispatch .. _near-real-time: https://en.wikipedia.org/wiki/Real-time_computing#Near_real-time .. _random walk: https://en.wikipedia.org/wiki/Random_walk .. _real-time: https://en.wikipedia.org/wiki/Real-time_computing .. _set theory: https://en.wikipedia.org/wiki/Set_theory .. _shield wall: https://en.wikipedia.org/wiki/Shield_wall .. _dynamic typing: .. _dynamically-typed: .. _static typing: .. _statically-typed: https://en.wikipedia.org/wiki/Type_system .. _topological sort: https://en.wikipedia.org/wiki/Topological_sorting .. _type inference: https://en.wikipedia.org/wiki/Type_inference .. _zero-cost abstraction: https://boats.gitlab.io/blog/post/zero-cost-abstractions
.. # ------------------( LINKS ~ kipling )------------------ .. _The Jungle Book: https://www.gutenberg.org/files/236/236-h/236-h.htm .. _Shere Khan: https://en.wikipedia.org/wiki/Shere_Khan
.. # ------------------( LINKS ~ math )------------------ .. _Euler–Mascheroni constant: https://en.wikipedia.org/wiki/Euler%E2%80%93Mascheroni_constant .. _coupon collector's problem: https://en.wikipedia.org/wiki/Coupon_collector%27s_problem .. _Big O: https://en.wikipedia.org/wiki/Big_O_notation
.. # ------------------( LINKS ~ math : set )------------------ .. _conjunction: https://en.wikipedia.org/wiki/Logical_conjunction .. _disjunction: https://en.wikipedia.org/wiki/Logical_disjunction .. _intersection: https://en.wikipedia.org/wiki/Intersection_(set_theory) .. _relative set complement: https://en.wikipedia.org/wiki/Complement_(set_theory)#Relative_complement
.. # ------------------( LINKS ~ math : type )------------------ .. _covariance: https://en.wikipedia.org/wiki/Covariance_and_contravariance_(computer_science)
.. # ------------------( LINKS ~ meme )------------------ .. _RNGesus: https://knowyourmeme.com/memes/rngesus .. _goes up to eleven: https://www.youtube.com/watch?v=uMSV4OteqBE .. _greased lightning: https://www.youtube.com/watch?v=H-kL8A4RNQ8 .. _ludicrous speed: https://www.youtube.com/watch?v=6tTvklMXeFE .. _the gripping hand: http://catb.org/jargon/html/O/on-the-gripping-hand.html
.. # ------------------( LINKS ~ os : linux )------------------ .. _Gentoo: https://www.gentoo.org
.. # ------------------( LINKS ~ os : macos )------------------ .. _macOS: https://en.wikipedia.org/wiki/MacOS .. _HomeBrew: https://brew.sh .. _MacPorts: https://www.macports.org
.. # ------------------( LINKS ~ other )------------------ .. _heliotrope: https://en.wikipedia.org/wiki/Heliotropium
.. # ------------------( LINKS ~ py )------------------ .. _Python: https://www.python.org .. _Python status: https://devguide.python.org/#status-of-python-branches .. _pip: https://pip.pypa.io
.. # ------------------( LINKS ~ py : cli )------------------ .. _-O: https://docs.python.org/3/using/cmdline.html#cmdoption-o .. _PYTHONOPTIMIZE: https://docs.python.org/3/using/cmdline.html#envvar-PYTHONOPTIMIZE
.. # ------------------( LINKS ~ py : interpreter )------------------ .. _Brython: https://brython.info .. _CPython: https://github.com/python/cpython .. _Nuitka: https://nuitka.net .. _Numba: https://numba.pydata.org .. _PyPy: https://www.pypy.org
.. # ------------------( LINKS ~ py : interpreter : cpython )------------------ .. _CPython bug tracker: https://github.com/python/cpython/issues
.. # ------------------( LINKS ~ py : lang )------------------ .. _generic alias parameters: https://docs.python.org/3/library/stdtypes.html#genericalias.__parameters__ .. _isinstancecheck: https://docs.python.org/3/reference/datamodel.html#customizing-instance-and-subclass-checks .. _mro: https://docs.python.org/3/library/stdtypes.html#class.__mro__ .. _object: https://docs.python.org/3/reference/datamodel.html#basic-customization .. _operator precedence: https://docs.python.org/3/reference/expressions.html#operator-precedence
.. # ------------------( LINKS ~ py : misc )------------------ .. _Guido van Rossum: https://en.wikipedia.org/wiki/Guido_van_Rossum .. _RealPython: https://realpython.com/python-type-checking
.. # ------------------( LINKS ~ py : package )------------------ .. _Django: https://www.djangoproject.com .. _NetworkX: https://networkx.org .. _Pandas: https://pandas.pydata.org .. _PyTorch: https://pytorch.org .. _SymPy: https://www.sympy.org .. _numerary: https://github.com/posita/numerary .. _pyenv: https://operatingops.org/2020/10/24/tox-testing-multiple-python-versions-with-pyenv .. _typing_extensions: https://pypi.org/project/typing-extensions
.. # ------------------( LINKS ~ py : package : boto3 )------------------ .. _Boto3: https://aws.amazon.com/sdk-for-python .. _bearboto3: https://github.com/beartype/bearboto3 .. _mypy-boto3: https://mypy-boto3.readthedocs.io
.. # ------------------( LINKS ~ py : package : jax )------------------ .. _jax.numpy: https://jax.readthedocs.io/en/latest/notebooks/thinking_in_jax.html
.. # ------------------( LINKS ~ py : package : numpy )------------------ .. _NumPy: https://numpy.org .. _numpy.dtype: https://numpy.org/doc/stable/reference/arrays.dtypes.html .. _numpy.empty_like: https://numpy.org/doc/stable/reference/generated/numpy.empty_like.html .. _numpy.floating: https://numpy.org/doc/stable/reference/arrays.scalars.html?highlight=numpy%20generic#numpy.floating .. _numpy.generic: https://numpy.org/doc/stable/reference/arrays.scalars.html?highlight=numpy%20generic#numpy.generic .. _numpy.integer: https://numpy.org/doc/stable/reference/arrays.scalars.html?highlight=numpy%20generic#numpy.integer .. _numpy.typing: https://numpy.org/devdocs/reference/typing.html .. _numpy.typing.NDArray: https://numpy.org/devdocs/reference/typing.html#ndarray
.. # ------------------( LINKS ~ py : package : sphinx )------------------ .. _Sphinx: https://www.sphinx-doc.org .. _sphinx.ext.autodoc: https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html
.. # ------------------( LINKS ~ py : package : test )------------------ .. _Codecov: https://about.codecov.io .. _pytest: https://docs.pytest.org .. _tox: https://tox.readthedocs.io
.. # ------------------( LINKS ~ py : service )------------------ .. _Anaconda: https://docs.conda.io/en/latest/miniconda.html .. _PyPI: https://pypi.org
.. # ------------------( LINKS ~ py : type : runtime )------------------ .. _enforce: https://github.com/RussBaz/enforce .. _enforce_typing: https://github.com/matchawine/python-enforce-typing .. _pydantic: https://pydantic-docs.helpmanual.io .. _pytypes: https://github.com/Stewori/pytypes .. _typeen: https://github.com/k2bd/typen .. _typical: https://github.com/seandstewart/typical
.. # ------------------( LINKS ~ py : type : runtime : typeg )------------------ .. _typeguard: https://github.com/agronholm/typeguard .. _typeguard.check_type: https://typeguard.readthedocs.io/en/latest/userguide.html#checking-types-directly
.. # ------------------( LINKS ~ py : type : runtime : data )------------------ .. _PyContracts: https://github.com/AlexandruBurlacu/pycontracts .. _contracts: https://pypi.org/project/contracts .. _covenant: https://github.com/kisielk/covenant .. _dpcontracts: https://pypi.org/project/dpcontracts .. _icontract: https://github.com/Parquery/icontract .. _pyadbc: https://pypi.org/project/pyadbc .. _pcd: https://pypi.org/project/pcd
.. # ------------------( LINKS ~ py : type : static )------------------ .. _Pyre: https://pyre-check.org .. _pytype: https://github.com/google/pytype
.. # ------------------( LINKS ~ py : type : static : pyright)------------------ .. _pyright: https://github.com/Microsoft/pyright .. _pyright plugins: https://github.com/microsoft/pyright/issues/607#issuecomment-873467941 .. _pyright PEP violation #1: https://github.com/beartype/beartype/issues/126 .. _pyright PEP violation #2: https://github.com/beartype/beartype/issues/127
.. # ------------------( LINKS ~ py : type : static : mypy )------------------ .. _mypy: http://mypy-lang.org .. _mypy install: https://mypy.readthedocs.io/en/stable/getting_started.html .. _mypy plugin: https://mypy.readthedocs.io/en/stable/extending_mypy.html .. _type narrowing: https://mypy.readthedocs.io/en/stable/type_narrowing.html
.. # ------------------( LINKS ~ py : type : tensor )------------------ .. _jaxtyping: https://github.com/google/jaxtyping .. _nptyping: https://github.com/ramonhagenaars/nptyping .. _TorchTyping: https://github.com/patrick-kidger/torchtyping
.. # ------------------( LINKS ~ soft : ide )------------------ .. _PyCharm: https://en.wikipedia.org/wiki/PyCharm .. _Vim: https://www.vim.org
.. # ------------------( LINKS ~ soft : ide : vscode )------------------ .. _Pylance: https://github.com/microsoft/pylance-release .. _VSCode: https://code.visualstudio.com .. _VSCode Mypy extension: https://marketplace.visualstudio.com/items?itemName=matangover.mypy
.. # ------------------( LINKS ~ soft : lang )------------------ .. _C: https://en.wikipedia.org/wiki/C_(programming_language) .. _C++: https://en.wikipedia.org/wiki/C%2B%2B .. _Ruby: https://www.ruby-lang.org .. _Rust: https://www.rust-lang.org
.. # ------------------( LINKS ~ soft : license )------------------ .. _MIT license: https://opensource.org/licenses/MIT
.. # ------------------( LINKS ~ soft : web )------------------ .. _React: https://reactjs.org