"Honestly, what you've built looks super solid and polished. In many ways, it's
what I wanted Hug to be - it's really inspiring to see someone build that."
Timothy Crosley - Hug [http://www.hug.rest/] creator 
[https://news.ycombinator.com/item?id=19455465]
"If you're looking to learn one modern framework for building REST APIs, check
out FastAPI [...] It's fast, easy to use and easy to learn [...]"
"We've switched over to FastAPI for our APIs [...] I think you'll like it [...]"
Ines Montani - Matthew Honnibal - Explosion AI [https://explosion.ai]
founders - spaCy [https://spacy.io] creators 
[https://twitter.com/_inesmontani/status/1144173225322143744] -
 [https://twitter.com/honnibal/status/1144031421859655680]
"We adopted the FastAPI library to spawn a REST server that can be queried to
obtain predictions. [for Ludwig]"
Piero Molino, Yaroslav Dudin, and Sai Sumanth Miryala - Uber 
[https://eng.uber.com/ludwig-v0-2/]
Requirements
Python 3.6+
FastAPI stands on the shoulders of giants:
Starlette[↪] for the web parts.
Pydantic[↪] for the data parts.
Installation
(ref)
(ref)
(ref)
(ref)

You will also need an ASGI server, for production such as Uvicorn[↪] or

Hypercorn[↪].

Example

Create it

Create a ﬁle main.py with:

pip install fastapi

pip install uvicorn

from fastapi import FastAPI

app = FastAPI()

@app.get("/")

def read_root():

return {"Hello": "World"}

@app.get("/items/{item_id}")

def read_item(item_id: int, q: str = None):

return {"item_id": item_id, "q": q}

Or use async def ...

If your code uses async / await , use async def :





from fastapi import FastAPI

app = FastAPI()

@app.get("/")

async def read_root():

return {"Hello": "World"}

@app.get("/items/{item_id}")

async def read_item(item_id: int, q: str = None):

return {"item_id": item_id, "q": q}

Run it

Run the server with:

Check it

Open your browser at http://127.0.0.1:8000/items/5?q=somequery[↪].

You will see the JSON response as:

You already created an API that:

Receives HTTP requests in the paths / and /items/{item_id} .

Both paths take GET operations (also known as HTTP methods).

The path /items/{item_id} has a path parameter item_id that should be

an int .

The path /items/{item_id} has an optional str query parameter q .

Interactive API docs

Note:

If you don't know, check the "In a hurry?" section about async and await in the docs

[https://fastapi.tiangolo.com/async/#in-a-hurry].

uvicorn main:app --reload

About the command uvicorn main:app --reload ...

The command uvicorn main:app refers to:

main : the ﬁle main.py (the Python "module").

app : the object created inside of main.py with the line app = FastAPI() .

--reload : make the server restart after code changes. Only do this for development.





{"item_id": 5, "q": "somequery"}

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