FastAPI installation and setup - Cheat Sheet & Quick Revision

Recall & Review

beginner

What command do you use to install FastAPI?

You use pip install fastapi to install FastAPI.

beginner

Why do you also need to install an ASGI server like Uvicorn when using FastAPI?

FastAPI is a framework, but it needs an ASGI server like Uvicorn to run your app and handle web requests.

beginner

What is the command to install Uvicorn with recommended extras?

You run pip install "uvicorn[standard]" to install Uvicorn with useful extras for production.

beginner

How do you start a FastAPI app using Uvicorn from the command line?

Use uvicorn main:app --reload where main is your Python file and app is your FastAPI instance. The --reload option restarts the server on code changes.

beginner

What is the minimal FastAPI app code to test your setup?

```python
from fastapi import FastAPI
app = FastAPI()

@app.get("/")
async def read_root():
    return {"Hello": "World"}
```

Which command installs FastAPI?

A pip install uvicorn

B pip install flask

C pip install fastapi

D pip install django

FastAPI is installed using pip install fastapi.

What role does Uvicorn play in FastAPI setup?

A It is an ASGI server to run the app

B It is a database

C It is a frontend framework

D It is a testing tool

Uvicorn is an ASGI server that runs FastAPI apps and handles web requests.

What does the --reload option do when running Uvicorn?

A Restarts server on code changes

B Enables debugging mode

C Runs server in production mode

D Disables logging

The --reload option restarts the server automatically when you change your code.

Which file and variable do you specify to run a FastAPI app with Uvicorn?

A server.py:fastapi

B app.py:main

C filename:app

D main:app

You specify main:app where main.py is the file and app is the FastAPI instance.

What is the first step after installing FastAPI and Uvicorn to see your app running?

A Install a database

B Write a FastAPI app code

C Run <code>python main.py</code>

D Open a browser

You need to write a FastAPI app code before running it with Uvicorn.

Describe the steps to install and run a basic FastAPI app.

Think about installation, coding, and running the server.

Explain why you need both FastAPI and Uvicorn to run a web app.

One builds, the other runs.