<img src="/img/tutorial/body/image05.png">

/// tip

# Debugging { #debugging }

You can connect the debugger in your editor, for example with Visual Studio Code or PyCharm.

## Call `uvicorn` { #call-uvicorn }

In your FastAPI application, import and run `uvicorn` directly:

{* ../../docs_src/debugging/tutorial001.py hl[1,15] *}

### About `__name__ == "__main__"` { #about-name-main }

The main purpose of the `__name__ == "__main__"` is to have some code that is executed when your file is called with:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

* in <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a>:

![editor support](https://fastapi.tiangolo.com/img/pycharm-completion.png)

## Design { #design }

Then I spent some time designing the developer "API" I wanted to have as a user (as a developer using FastAPI).

I tested several ideas in the most popular Python editors: PyCharm, VS Code, Jedi based editors.

* <a href="https://code.visualstudio.com/docs/python/environments#_select-and-activate-an-environment" class="external-link" target="_blank">VS Code</a>
* <a href="https://www.jetbrains.com/help/pycharm/creating-virtual-environment.html" class="external-link" target="_blank">PyCharm</a>

/// tip

You normally have to do this only **once**, when you create the virtual environment.

///

https://medium.com/@williamhayes link: https://medium.com/@williamhayes/fastapi-starlette-debug-vs-prod-5f7561db3a59 title: FastAPI/Starlette debug vs prod - author: Mukul Mantosh author_link: https://x.com/MantoshMukul link: https://www.jetbrains.com/pycharm/guide/tutorials/fastapi-aws-kubernetes/ title: Developing FastAPI Application using K8s & AWS - author: KrishNa author_link: https://medium.com/@krishnardt365 link: https://medium.com/@krishnardt365/fastapi-docker-and-postgres-91943e71be92 title:...

* Add note about [PyCharm Pydantic plugin](https://github.com/koxudaxi/pydantic-pycharm-plugin) to docs. PR [#1420](https://github.com/tiangolo/fastapi/pull/1420) by [@koxudaxi](https://github.com/koxudaxi).