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LangChain Tutorial: Build Your First LLM App in Python

Quick answer LangChain is a Python framework for building applications powered by large language models, and in current LangChain 1.x you compose those applications with LCEL, the LangChain Expression Language, written as prompt | model | parser. This post builds a working support-ticket triage cha…

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  1. 2026-11-14 07:16 · DEV Community — AI
    LangChain Tutorial: Build Your First LLM App in Python

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