FastAPI is quickly becoming the go-to framework for building APIs with Python. With its incredible speed and automatic generation of OpenAPI documentation, it empowers developers to create robust applications with less effort. In this tutorial, we’ll guide you through building your first FastAPI application in just a few simple steps!
### Why Choose FastAPI?
FastAPI is designed for high performance, offering asynchronous capabilities out of the box. What sets it apart? Its automatic data validation and interactive API docs (Swagger UI and ReDoc) make it user-friendly, even for beginners! 🌟
### Prerequisites
Before diving into the code, ensure you have:
– Python 3.7 or later
– Basic knowledge of Python programming
– A code editor (like VSCode) installed
### Step 1: Install FastAPI and Uvicorn
First, let’s install FastAPI and Uvicorn (an ASGI server):
“`bash
pip install fastapi uvicorn
“`
### Step 2: Create Your First FastAPI App
Now, let’s create a simple FastAPI app. Open your code editor and create a new file called `main.py`. Add the following code:
“`python
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, “query”: q}
“`
### Step 3: Run Your FastAPI Application
Next, you can run your application using the Uvicorn server. Open your terminal and execute:
“`bash
uvicorn main:app –reload
“`
– `main`: This refers to the file name (without `.py`).
– `app`: This is the FastAPI instance we created.
Visit [http://127.0.0.1:8000](http://127.0.0.1:8000) in your browser. You should see the message `{“Hello”: “World”}`! 🎉
### Step 4: Explore Your Interactive API Docs
FastAPI automatically generates API documentation. You can access it at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs) for Swagger UI or [http://127.0.0.1:8000/redoc](http://127.0.0.1:8000/redoc) for ReDoc. Here, you’ll see the routes you defined and can interact with them seamlessly.
### Conclusion
Congratulations! You’ve successfully built your first API with FastAPI. This brief introduction just scratches the surface of what FastAPI can do, from data validation to background tasks.
FastAPI streamlines your development process and enhances performance, making it ideal for building high-performing applications.
### Next Steps
To deepen your knowledge, you can explore advanced topics such as:
– Dependency Injection
– OAuth2 authentication
– Middleware integration
– Asynchronous database connections
Jump into the FastAPI documentation for more detailed and context-rich examples: [FastAPI Documentation](https://fastapi.tiangolo.com/).
Happy coding! 💻✨
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