LangChain/Blog/25/04/17 LangChain Python Improved Content Blocks Retry Logic and More

• LangChain Python Updates: Improved Content Blocks, Retry Logic and More

  • Original Announcement

  • Standardized Multimodal Content Blocks

    • Documentation
    • Example:
      • python

        from langchain_core.messages import HumanMessage, AIMessage
        from langchain_core.messages.content import ImageContent, TextContent
        
        # Create a message with both text and image content
        message = HumanMessage(
            content=[
                TextContent(text="What's in this image?"),
                ImageContent(
                    image_url="https://example.com/image.jpg",
                    image_path=None,
                    mime_type="image/jpeg"
                )
            ]
        )

  • ChatPromptTemplate with Arbitrary Content Blocks

    • Documentation
    • Example:
      • python

        from langchain_core.prompts import ChatPromptTemplate
        from langchain_core.messages import HumanMessage
        
        # Create a template that can handle text and images
        template = ChatPromptTemplate.from_messages([
            ("human", [
                {"type": "text", "text": "Describe this image:"},
                {"type": "image_url", "image_url": "{image_url}"}
            ])
        ])
        
        # Format the template
        messages = template.format_messages(
            image_url="https://example.com/image.jpg"
        )

  • Custom Programming/Error/Handling/Retry Logic/Exponential Backoff for Runnable.with_retry

    • Documentation
    • Example:
      • python

        from langchain_core.runnables import RunnableConfig
        
        # Configure custom retry parameters
        chain_with_retries = chain.with_retry(
            retry_patterns={
                "ConnectionError": {
                    "max_attempts": 3,
                    "initial_delay": 1.0,
                    "max_delay": 60.0,
                    "exponential_base": 2.0,
                }
            }
        )