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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"misleading SyntaxError (f-string and type alias related)","articleBody":"# Bug report\n\n### Bug description:\n\nThe following code produces a misleading syntax error.\n\n```python\nlambda name_3=f'{name_4}': {name_3}\n\ntype {}[name_4] = {}\n\n```\n\noutput (Python 3.12.0rc2+):\n```python\n  File \"/home/frank/projects/pysource-codegen/bug.py\", line 1\n    lambda name_3=f'{name_4}': {name_3}\n    ^^^^^^^^^^^^^^^^^^^^^^^^^^\nSyntaxError: f-string: lambda expressions are not allowed without parentheses\n```\nThe first line should be valid python syntax and I would expect to get an syntax error for the wrong type alias name.\n\nside note:\nThis is generated code. I found this issue during my work for the python 3.12 support for pysource-codegen.\n\n### CPython versions tested on:\n\n3.12\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-109121\n* gh-109155\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/15r10nk","@type":"Person","name":"15r10nk"},"datePublished":"2023-09-07T21:06:09.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/109114/cpython/issues/109114"}