`typing.Union` does not support attribute assignment post gh-105511 · Issue #132139 · python/cpython · GitHub

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Pull requests 2.6k

Security and quality 0

3.14bugs and security fixes

extension-modulesC modules in the Modules dir

stdlibStandard Library Python modules in the Lib/ directory

type-bugAn unexpected behavior, bug, or error

gh-105499: Merge typing.Union and types.UnionType #105511

https://github.com/metaopt/optree/blob/v0.15.0/optree/typing.py#L246-L254

Before #105511, typing.Union is implemented in Python, and custom attributes can be assigned to a Union variable.

gh-132139: Document that you can no longer set attributes on unions #132146

gh-132139: 3.14 what's new: elaborate on why you can no longer set Union attributes #132157