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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"3.12.0a7 changes behavior of PropertyMock","articleBody":"# Bug report\r\n\r\n3.12.0a7 changed the behavior of `unittest.mock.PropertyMock`\r\n\r\nSetup:\r\n```\r\nfrom unittest.mock import MagicMock, PropertyMock\r\nm = MagicMock()\r\np1 = PropertyMock(return_value=3)\r\np2 = PropertyMock(side_effect=ValueError)\r\ntype(m).foo = p1\r\ntype(m).bar = p2\r\n```\r\n\r\nIn Python 3.12.0a6 and earlier, `m.foo` evaluates as 3, and `m.bar` raises a ValueError.\r\n\r\nIn Python 3.12.0a7, `m.foo` evaluates as 3, and `m.bar` returns `\u003cMagicMock name='mock.bar' id=...\u003e`\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on: 3.12.0a7, 3.12.0a6, 3.11.2, 3.10.10, 3.9.16, 3.8.16\r\n- Operating system and architecture: \r\n  - macOS Ventura 13.2.1, on an M1 MacBook Pro.\r\n  - GitHub Actions macOS 12 x86_64 \r\n  - GitHub Actions Ubuntu 22.04\r\n  - GitHub Actions Windows Server 2022\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-103358\n* gh-103364\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/freakboy3742","@type":"Person","name":"freakboy3742"},"datePublished":"2023-04-07T04:02:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/103329/cpython/issues/103329"}