LangChain – Building Practical Chains
Hands-on examples of chaining prompts and integrating APIs with LangChain (LCEL & Modern API)
Prerequisites
Basic Python skills (functions, imports)
OpenAI API account and key
External API key (e.g., OpenWeatherMap)
pip installpermissions
Introduction & Chain Types
LangChain is a modular framework for orchestrating LLMs, tools, and retrievers into chains—pipelines that pass data step-by-step. As of LangChain v0.1.x (mid‑2025), the LangCh…
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