app.py

from pydantic import BaseModel
from fastapi import FastAPI
from typing import List, Optional

app = FastAPI()

# 1. Define the blueprint for APIs
class Customer(BaseModel):
    name: str
    email: str
    phone: Optional[str] = None
    address: Optional[str] = None

customers_list = []
# Create
@app.post("/customers", response_model=Customer)
def create_customer(customer: Customer):
    customers_list.append(customer)
    return customer
# Read
@app.get("/customers", response_model=List[Customer])
def get_customers():
    return customers_list
#Update
@app.put("/customers/{customer_id}", response_model=Customer)
def update_customer(customer_id: int, customer: Customer):
    customers_list[customer_id] = customer
    return customer
#Delete
@app.delete("/customers/{customer_id}", response_model=Customer)
def delete_customer(customer_id: int):
    customers_list.pop(customer_id)
    return {"message": "Customer deleted successfully"}