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Title: bpo-43892: Make match patterns explicit in AST by ncoghlan · Pull Request #25585 · python/cpython · GitHub

Open Graph Title: bpo-43892: Make match patterns explicit in AST by ncoghlan · Pull Request #25585 · python/cpython

X Title: bpo-43892: Make match patterns explicit in AST by ncoghlan · Pull Request #25585 · python/cpython

Description: Separates "pattern" and "expr" nodes in AST Adds a new "Pattern matching" section in the ast docs, separate from the "Control flow" section AST node names are inspired by the AST proposed in PEP 642, but adjusted to better match the semantics of PEP 634 and to be more consistent with the existing AST Grammar definition has been updated to emit the newly defined AST nodes Parser now emits SyntaxError for ill-formed complex literals (so the AST optimiser no longer has to do it) Code generator consumes the new nodes AST validator consumes the new nodes AST unparser consumes new nodes test_unparse always checks the AST roundtrip for test_patma.py Add some clarifying comments to the unparsing code https://bugs.python.org/issue43892

Open Graph Description: Separates "pattern" and "expr" nodes in AST Adds a new "Pattern matching" section in the ast docs, separate from the "Control flow" section AST node names ar...

X Description: Separates "pattern" and "expr" nodes in AST Adds a new "Pattern matching" section in the ast docs, separate from the "Control flow&...

Opengraph URL: https://github.com/python/cpython/pull/25585

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