Summary - FastAPI

Combine @app.get, Pydantic and path params to write a tasks API.

Summary - FastAPI

In this group you learned the core concepts of FastAPI. FastAPI() for the app, @app.get for GET routes, BaseModel for the request body, path parameter for the URL path, query parameter for the URL query.

@app.get("/tasks/{task_id}")
def read(task_id: int, q: str = None):
    return {"task_id": task_id, "q": q}

In the final step you will combine all of these to write a tasks API.

Exercise Tasks API

Start with from fastapi import FastAPI and from fastapi.testclient import TestClient. Define app = FastAPI(). With @app.get("/tasks/{task_id}") define def read(task_id: int, q: str = None): returning {"task_id": task_id, "q": q}. Create a client with client = TestClient(app). Print the response body with print(client.get("/tasks/5?q=ara").text).

Show example solution

from fastapi import FastAPI
from fastapi.testclient import TestClient

app = FastAPI()

@app.get("/tasks/{task_id}")
def read(task_id: int, q: str = None):
    return {"task_id": task_id, "q": q}

client = TestClient(app)
print(client.get("/tasks/5?q=ara").text)

Test yourself

Which one declares a path parameter?
- @app.get("/items")
- @app.get("/items/{id}")
- @app.get("/items?id=5")
- @app.get("/")
Show answer

@app.get("/items/{id}") — The {id} placeholder declares a path parameter.
Match the group tools

FastAPI()

Creates the app
@app.get

Defines a GET route
BaseModel

Is the request body
{item_id}

Is a path parameter

Next lesson: BaseModel

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