Pdf - Fastapi Tutorial

from fastapi import FastAPI, Depends, HTTPException from sqlalchemy.orm import Session import models, schemas, database models.Base.metadata.create_all(bind=database.engine) app = FastAPI() @app.post("/users/", response_model=schemas.UserResponse) def create_user(user: schemas.UserCreate, db: Session = Depends(database.get_db)): db_user = db.query(models.DbUser).filter(models.DbUser.email == user.email).first() if db_user: raise HTTPException(status_code=400, detail="Email already registered") # In production, make sure to hash the password before saving! new_user = models.DbUser(email=user.email, hashed_password=user.password) db.add(new_user) db.commit() db.refresh(new_user) return new_user Use code with caution. 10. Best Practices for Production Deployment

@app.get("/validate/") def validate( q: str = Query(..., min_length=3, max_length=50, regex="^[a-z]+$"), item_id: int = Path(..., ge=1, le=1000) ): return "q": q, "item_id": item_id

from fastapi import FastAPI # Initialize the FastAPI application app = FastAPI( title="FastAPI PDF Tutorial API", description="A sample API built for our comprehensive FastAPI guide.", version="1.0.0" ) @app.get("/") def read_root(): return "message": "Welcome to the FastAPI Tutorial!" @app.get("/items/item_id") def read_item(item_id: int, q: str = None): return "item_id": item_id, "query": q Use code with caution. Running the Application Start your development server by running: fastapi dev main.py Use code with caution. (Alternatively, you can use: uvicorn main:app --reload )

from typing import Optional from fastapi import FastAPI from pydantic import BaseModel, Field app = FastAPI() # Define the Pydantic schema class Item(BaseModel): name: str = Field(..., example="Wireless Mouse") description: Optional[str] = Field(None, max_length=300) price: float = Field(..., gt=0, description="The price must be greater than zero") tax: Optional[float] = None @app.post("/items/") def create_item(item: Item): # The data is already validated here item_dict = item.dict() if item.tax: price_with_tax = item.price + item.tax item_dict.update("price_with_tax": price_with_tax) return item_dict Use code with caution. 6. Response Models and Status Codes fastapi tutorial pdf

FastAPI leverages Python type hints to validate incoming request data automatically. Path Parameters

FastAPI handles URL components natively using Python type hints, validating data automatically. Path Parameters

The official FastAPI documentation is extensive. You can use browser extensions like "Print Friendly & PDF" to curate specific sections into a single document. Summary Roadmap Basics: Routing, Path/Query Params. Data: Pydantic models and request bodies. Database: Integration with SQLAlchemy or Tortoise ORM. Security: Implementing JWT authentication. Best Practices for Production Deployment @app

from fastapi import FastAPI from pydantic import BaseModel

Now, install FastAPI and Uvicorn, an ASGI server that will run your application: pip install fastapi uvicorn Creating Your First API Create a file named main.py and add the following code: from fastapi import FastAPI app = FastAPI() @app.get("/")def read_root():return "Hello": "World"

Always pair your FastAPI tutorial PDF with the official documentation to ensure you are using the latest best practices, as the framework updates frequently. If you'd like to dive deeper, let me know if you'd like to: . CMD ["uvicorn"

# Create a list to store our items items = [ "id": 1, "name": "Item 1", "description": "This is item 1", "id": 2, "name": "Item 2", "description": "This is item 2", ]

FROM python:3.11 WORKDIR /app COPY requirements.txt . RUN pip install --no-cache-dir -r requirements.txt COPY . . CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

Reuses standard logic, connection systems, or security rules raise HTTPException(404) Aborts operations to return strict semantic error codes How to Save This Tutorial as a PDF