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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["pytest","python","python-library","python-package","testing"],"created_at":"2024-12-05T05:07:23.046Z","updated_at":"2026-02-10T00:03:33.072Z","avatar_url":"https://github.com/artisanofcode.png","language":"Python","readme":"# Conjecture\n\nA pythonic assertion library.\n\n## 🛠 Installing\n\n### Poetry\n\n```\npoetry add conjecture\n```\n\n### pip\n\n```\npip install conjecture\n```\n\n## 🎓 Usage\n\n\n### Basic\n\nA basic assertion.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 5 == conjecture.has(lambda v: v \u003c 10)\n\u003e\u003e\u003e assert 5 == conjecture.has(lambda v: v \u003e 10)\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nAssertionError\n```\n\n### Built-in conjectures\n\n#### General\n\nMatching none.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert None == conjecture.none()\n```\n\nMatching anything.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert None == conjecture.anything()\n\u003e\u003e\u003e assert 123 == conjecture.anything()\n\u003e\u003e\u003e assert \"abc\" == conjecture.anything()\n```\n\n#### Mapping\n\nMatching keys.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert {\"a\": 1} == conjecture.has_key(\"a\")\n\u003e\u003e\u003e assert {\"a\": 1} == conjecture.has_key(\"a\", of=1)\n\u003e\u003e\u003e assert {\"a\": 1} == conjecture.has_key(\"a\", of=conjecture.less_than(5))\n```\n\n#### Object\n\nMatching instances of a class.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 123 == conjecture.instance_of(int)\n\u003e\u003e\u003e assert \"abc\" == conjecture.instance_of((str, bytes))\n```\n\nMatching values.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 123 == conjecture.equal_to(123)\n\u003e\u003e\u003e assert \"abc\" == conjecture.equal_to(\"abc\")\n```\n\nMatching attributes.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 1 == conjecture.has_attribute(\"__class__\")\n\u003e\u003e\u003e assert 1 == conjecture.has_attribute(\"__class__\", of=int)\n\u003e\u003e\u003e assert 1 == conjecture.has_attribute(\"__class__\", of=conjecture.instance_of(type))\n```\n\n#### Rich ordering\n\nMatching lesser values.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 5 == conjecture.greater_than(1)\n\u003e\u003e\u003e assert 5 == conjecture.greater_than_or_equal_to(1)\n```\n\nMatching greater values.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 1 == conjecture.less_than(5)\n\u003e\u003e\u003e assert 1 == conjecture.less_than_or_equal_to(5)\n```\n\n#### Size\n\nMatching empty collections.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert list() == conjecture.empty()\n\u003e\u003e\u003e assert set() == conjecture.empty()\n\u003e\u003e\u003e assert tuple() == conjecture.empty()\n\u003e\u003e\u003e assert dict() == conjecture.empty()\n```\n\nMatching length of collections.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert [1, 2, 3, 4, 5] == conjecture.length_of(5)\n\u003e\u003e\u003e assert [1, 2, 3] == conjecture.length_of(conjecture.less_than(5))\n```\n\n#### String\n\nMatching string prefixes.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert \"foo bar baz\" == conjecture.prefixed_with(\"foo\")\n\u003e\u003e\u003e assert b\"foo bar baz\" == conjecture.prefixed_with(b\"foo\")\n```\n\nMatching string suffixes.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert \"foo bar baz\" == conjecture.suffixed_with(\"baz\")\n\u003e\u003e\u003e assert b\"foo bar baz\" == conjecture.suffixed_with(b\"baz\")\n```\n\n### Combined conjectures\n\nMatching all conditions.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 5 == conjecture.has(lambda v: v \u003c= 5) \u0026 conjecture.has(lambda v: v =\u003e 5)\n\u003e\u003e\u003e assert 6 == conjecture.has(lambda v: v \u003c= 5) \u0026 conjecture.has(lambda v: v =\u003e 5)\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nAssertionError\n\u003e\u003e\u003e assert 5 == conjecture.all_of(\n...     conjecture.has(lambda v: v \u003c= 5),\n...     conjecture.has(lambda v: v =\u003e 5)\n... )\n\u003e\u003e\u003e assert 6 == conjecture.all_of(\n...     conjecture.has(lambda v: v \u003c= 5),\n...     conjecture.has(lambda v: v =\u003e 5)\n... )\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nAssertionError\n```\n\nMatching any conditions.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 0 == conjecture.has(lambda v: v == 5) | conjecture.has(lambda v: v == 0)\n\u003e\u003e\u003e assert 5 == conjecture.has(lambda v: v == 5) | conjecture.has(lambda v: v == 0)\n\u003e\u003e\u003e assert 6 == conjecture.has(lambda v: v == 5) | conjecture.has(lambda v: v == 0)\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nAssertionError\n\u003e\u003e\u003e assert 5 == conjecture.any_of(\n...     conjecture.has(lambda v: v == 5),\n...     conjecture.has(lambda v: v == 0)\n... )\n\u003e\u003e\u003e assert 6 == conjecture.any_of(\n...     conjecture.has(lambda v: v == 5),\n...     conjecture.has(lambda v: v == 0)\n... )\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nAssertionError\n```\n\n### Negation\n\nA negative assertion.\n\n```pycon\n\u003e\u003e\u003e import conjecture\n\u003e\u003e\u003e assert 5 != conjecture.has(lambda v: v == 10)\n\u003e\u003e\u003e assert 5 == ~conjecture.has(lambda v: v == 10)\n\u003e\u003e\u003e assert 10 == ~conjecture.has(lambda v: v == 10)\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nAssertionError\n```\n\n## ⚖️ Licence\n\nThis project is licensed under the [MIT licence](http://dan.mit-license.org/).\n\nAll documentation and images are licenced under the \n[Creative Commons Attribution-ShareAlike 4.0 International License][cc_by_sa].\n\n[cc_by_sa]: https://creativecommons.org/licenses/by-sa/4.0/\n\n## 📝 Meta\n\nThis project uses [Semantic Versioning](http://semver.org/).\n","funding_links":["https://github.com/sponsors/artisanofcode","https://ko-fi.com/danielknell"],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fartisanofcode%2Fpython-conjecture","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fartisanofcode%2Fpython-conjecture","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fartisanofcode%2Fpython-conjecture/lists"}