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# 极客时间专栏学习之旅
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# Sample Code
This code is used to demonstrate A2A capabilities as the spec progresses.\ Samples are divided into 3 sub directories:
* [**Common**](/samples/python/common)
Common code that all sample agents and apps use to speak A2A over HTTP.
* [**Agents**](/samples/python/agents/README.md)
Sample agents written in multiple frameworks that perform example tasks with tools. These all use the common A2AServer.
* [**Hosts**](/samples/python/hosts/README.md)
Host applications that use the A2AClient. Includes a CLI which shows simple task completion with a single agent, a mesop web application that can speak to multiple agents, and an orchestrator agent that delegates tasks to one of multiple remote A2A agents.
## Prerequisites
- Python 3.13 or higher
- [UV](https://docs.astral.sh/uv/)
## Running the Samples
Run one (or more) [agent](/samples/python/agents/README.md) A2A server and one of the [host applications](/samples/python/hosts/README.md).
The following example will run the langgraph agent with the python CLI host:
1. Navigate to the agent directory:
\`\`\`bash
cd samples/python/agents/langgraph
\`\`\`
2. Run an agent:
\`\`\`bash
uv run .
\`\`\`
3. In another terminal, navigate to the CLI directory:
\`\`\`bash
cd samples/python/hosts/cli
\`\`\`
4. Run the example client
\`\`\`
uv run .
\`\`\`
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**NOTE:**
This is sample code and not production-quality libraries.
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