create main.py

main.py

@@ -0,0 +1,50 @@
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+from typing import List
+
+app = FastAPI(
+    title="FastAPI CRUD Example",
+    description="A simple CRUD API with FastAPI",
+    version="1.0.0",
+    docs_url="/docs",
+    redoc_url="/redoc"
+)
+
+# In-memory storage
+items = []
+
+class Item(BaseModel):
+    id: int
+    name: str
+    description: str = None
+
+@app.get("/")
+async def root():
+    return {"message": "Welcome to FastAPI CRUD API! Go to /docs to test the API."}
+
+@app.get("/items", response_model=List[Item])
+async def get_items():
+    return items
+
+@app.post("/items", response_model=Item)
+async def add_item(item: Item):
+    if any(i.id == item.id for i in items):
+        raise HTTPException(status_code=400, detail="Item ID already exists")
+    items.append(item)
+    return item
+
+@app.put("/items/{item_id}", response_model=Item)
+async def update_item(item_id: int, updated_item: Item):
+    for index, item in enumerate(items):
+        if item.id == item_id:
+            items[index] = updated_item
+            return updated_item
+    raise HTTPException(status_code=404, detail="Item not found")
+
+@app.delete("/items/{item_id}")
+async def delete_item(item_id: int):
+    for item in items:
+        if item.id == item_id:
+            items.remove(item)
+            return {"message": "Item deleted"}
+    raise HTTPException(status_code=404, detail="Item not found")