bind() — langchain Function Reference

Architecture documentation for the bind() function in base.py from the langchain codebase.

Function python LangChainCore Runnables calls 1 called by 2

Entity Profile

LangChainCore→ Runnables→ bind() — langchain Function Reference

Dependency Diagram

graph TD
  00bd9223_b529_b9b6_8840_dfaa74cdb507["bind()"]
  4a62481c_02cb_a5de_1833_50669d5351a6["Runnable"]
  00bd9223_b529_b9b6_8840_dfaa74cdb507 -->|defined in| 4a62481c_02cb_a5de_1833_50669d5351a6
  b259cdaa_baff_74d1_86dc_2d7da84c4711["bind()"]
  b259cdaa_baff_74d1_86dc_2d7da84c4711 -->|calls| 00bd9223_b529_b9b6_8840_dfaa74cdb507
  65d78490_cc2d_e086_e4c4_bcee7b7af69f["bind()"]
  65d78490_cc2d_e086_e4c4_bcee7b7af69f -->|calls| 00bd9223_b529_b9b6_8840_dfaa74cdb507
  b259cdaa_baff_74d1_86dc_2d7da84c4711["bind()"]
  00bd9223_b529_b9b6_8840_dfaa74cdb507 -->|calls| b259cdaa_baff_74d1_86dc_2d7da84c4711
  style 00bd9223_b529_b9b6_8840_dfaa74cdb507 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/runnables/base.py lines 1610–1642

    def bind(self, **kwargs: Any) -> Runnable[Input, Output]:
        """Bind arguments to a `Runnable`, returning a new `Runnable`.

        Useful when a `Runnable` in a chain requires an argument that is not
        in the output of the previous `Runnable` or included in the user input.

        Args:
            **kwargs: The arguments to bind to the `Runnable`.

        Returns:
            A new `Runnable` with the arguments bound.

        Example:
            ```python
            from langchain_ollama import ChatOllama
            from langchain_core.output_parsers import StrOutputParser

            model = ChatOllama(model="llama3.1")

            # Without bind
            chain = model | StrOutputParser()

            chain.invoke("Repeat quoted words exactly: 'One two three four five.'")
            # Output is 'One two three four five.'

            # With bind
            chain = model.bind(stop=["three"]) | StrOutputParser()

            chain.invoke("Repeat quoted words exactly: 'One two three four five.'")
            # Output is 'One two'
            ```
        """
        return RunnableBinding(bound=self, kwargs=kwargs, config={})