Unbearably fast near-real-time hybrid runtime-static type-checking in pure Python.
.. # ------------------( LICENSE )------------------ .. # Copyright (c) 2014-2024 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 )------------------
|rtd-badge| |ci-badge| |codecov-badge|
⚠
`Beartype documentation lives at ReadTheDocs (RTD) <beartype 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 <beartype license_>__ pure-Python <beartype pure_>__ PEP-compliant <beartype PEPs_>__ near-real-time <beartype FAQ_>__
hybrid runtime-static <beartype hybrid_>__ third-generation <beartype third_>__ type checker <beartype ELI5_>__ 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 <beartype organization_>__ gratefully thanks our family of .. #breathtaking GitHub Sponsors <beartype sponsorship_>:
.. #
.. #* Your iconic URL here. Let us bestow you with eyeballs <beartype .. # sponsorship_>.
.. #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
$ pip3 install beartype
$ 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
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 <beartype APIs>. For those who are about to QA, beartype salutes
you. Would you like to know more?
$ python3
.. code-block:: python
from beartype import beartype # <-- eponymous import; it's eponymous
@beartype # <-- you too will believe in magic ... def quote_wiggum(lines: list[str]) -> None: ... print('“{}”\n\t— Police Chief Wiggum'.format("\n ".join(lines)))
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
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 "", line 1, in File "", line 30, in quote_wiggum File "/home/springfield/beartype/lib/python3.9/site-packages/beartype/_decor/_code/_pep/_error/errormain.py", line 220, in get_beartype_violation raise exception_cls( beartype.roar.BeartypeCallHintParamViolation: @beartyped quote_wiggum() parameter lines=[b'Oh, my God! A horrible plane crash!', b'Hey, everybody! Get a load of thi...'] violates type hint list[str], as list item 0 value b'Oh, my God! A horrible plane crash!' not str.
from beartype.vale import Is # <---- validator factory from typing import Annotated # <---------------- if Python ≥ 3.9.0
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 ... ]
@beartype ... def quote_wiggum_safer(lines: ListOfStrings) -> None: ... print('“{}”\n\t— Police Chief Wiggum'.format("\n ".join(lines)))
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)].
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.
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
Beartype brings Rust_- and C++-inspired zero-cost abstractions <zero-cost abstraction_>__ into the lawless world of dynamically-typed Python by
enforcing type safety at the granular level of functions and methods <beartype ELI5_>__ against type hints standardized by the Python community <beartype PEPs_>__ in O(1) non-amortized worst-case time with negligible constant factors <beartype math_>. If the prior sentence was unreadable jargon, see our friendly and approachable FAQ for a human-readable synopsis <beartype FAQ_>.
Beartype is portably implemented <beartype codebase_>__ in Python 3 <Python_>, continuously stress-tested <beartype tests_> via GitHub Actions_ × tox_ × pytest_ × Codecov_, and permissively distributed <beartype license_>__ under the MIT license_. Beartype has no
runtime dependencies, only one test-time dependency <pytest_>, and only one documentation-time dependency <Sphinx_>. Beartype supports all actively developed Python versions <Python status_>, all Python package managers <beartype install_>, and multiple platform-specific package managers <beartype install_>__.
.. # FIXME: Gah! Libraries.io has fallen down and cannot get back up... AGAIN.
.. # Beartype powers quality assurance across the Python ecosystem <beartype .. # dependents_>__.
.. # 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.png :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/workflows/test/badge.svg :target: https://github.com/beartype/beartype/actions?workflow=test :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
FAQs
Unbearably fast near-real-time hybrid runtime-static type-checking in pure Python.
We found that beartype demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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