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core: Add Ellipsis ... syntax support for implicit RunnablePassthrough #29570

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core: Add Ellipsis ... syntax support for implicit RunnablePassthrough #29570

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m7mdhka
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@m7mdhka m7mdhka commented Feb 4, 2025 •
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  • PR message: Delete this entire checklist and replace with
    • Description: Adds support for using Python's Ellipsis (...) as shorthand for RunnablePassthrough() in LCEL chains. Enables cleaner syntax:
    chain = retriever | prompt | llm | {"passthrough": ..., "somerunnable": lambda_runnable}

      chain = (
    ...
    | llm
    | {
        "A": ...,
        "b": ...
    }
)
    • Dependencies: None
    • Twitter handle: @m7md_hka

@dosubot dosubot bot added the size:XS This PR changes 0-9 lines, ignoring generated files. label Feb 4, 2025
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vercel bot commented Feb 4, 2025 •
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@dosubot dosubot bot added the 🤖:nit Small modifications/deletions, fixes, deps or improvements to existing code or docs label Feb 4, 2025
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🤖:nit Small modifications/deletions, fixes, deps or improvements to existing code or docs size:XS This PR changes 0-9 lines, ignoring generated files.
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