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README.md

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+---
+title: Backend1
+emoji: 🏢
+colorFrom: yellow
+colorTo: yellow
+sdk: docker
+pinned: false
+---
+
+Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference

app.py

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+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel,Field
+import pandas as pd
+import logging
+
+# Configure logging
+logging.basicConfig(
+    level=logging.INFO,  # Set the logging level to INFO
+    format="%(asctime)s - %(levelname)s - %(message)s",
+    handlers=[
+        logging.FileHandler("app.log"),  # Log to a file named app.log
+        logging.StreamHandler()  # Log to the console
+    ]
+)
+
+# Create logger instance
+logger = logging.getLogger(__name__)
+
+app = FastAPI()
+
+file_path = "C:/java lab/python/backend/world_population.csv"
+
+try:
+    countries_df = pd.read_csv(file_path)
+    # Convert Population and Area to numeric values with error handling
+    countries_df["Population"] = pd.to_numeric(countries_df["Population"])
+    countries_df["Area"] = pd.to_numeric(countries_df["Area"])
+    logger.info("CSV file loaded and processed successfully.")
+except Exception as e:
+    logger.error(f"Failed to load or process CSV file: {e}")
+    raise
+
+# Pydantic models for API response
+class CountryPopulation(BaseModel):
+    country: str
+    population: int
+
+
+class ContinentPopulationResponse(BaseModel):
+    continent: str=Field(description="continent of country")
+    total_population: int
+    total_area: int
+    continent_population_density: float
+    max_population: CountryPopulation
+    min_population: CountryPopulation
+    avg_population: int
+
+
+@app.get("/")
+def home():
+    logger.info("Accessed home endpoint.")
+    return {"message": "Welcome to the World Population API"}
+
+
+@app.get("/continent/{continent_name}", response_model=ContinentPopulationResponse)
+def get_continent_population(continent_name: str):
+    try:
+        logger.info(f"Received request for continent: {continent_name}")
+        
+        # Filter data for the given continent
+        continent_group = countries_df[countries_df["Continent"] == continent_name]
+        continent_group = continent_group.dropna(subset=["Population", "Area"])
+        
+        if continent_group.empty:
+            logger.warning(f"No data found for continent: {continent_name}")
+            raise HTTPException(status_code=404, detail=f"No data found for continent: {continent_name}")
+
+        # Calculate total population and total area
+        total_population = int(continent_group["Population"].sum())
+        total_area = int(continent_group["Area"].sum())
+
+        # Handle case where total_area is zero to avoid division by zero
+        if total_area == 0:
+            logger.error(f"Total area is zero for continent: {continent_name}. Cannot calculate population density.")
+            raise HTTPException(status_code=400, detail="Total area is zero. Cannot calculate population density.")
+
+        # Calculate population density
+        continent_density = total_population / total_area
+
+        # Find max and min population countries
+        max_row = continent_group.loc[continent_group["Population"].idxmax()]
+        min_row = continent_group.loc[continent_group["Population"].idxmin()]
+        avg_population = int(continent_group["Population"].mean())
+
+        logger.info(
+            f"Processed data for continent: {continent_name} | "
+            f"Total Population: {total_population}, Total Area: {total_area}, "
+            f"Population Density: {continent_density:.2f}"
+        )
+
+        return ContinentPopulationResponse(
+            continent=continent_name,
+            total_population=total_population,
+            total_area=total_area,
+            continent_population_density=continent_density,
+            max_population=CountryPopulation(
+                country=max_row["Country"],
+                population=int(max_row["Population"])
+            ),
+            min_population=CountryPopulation(
+                country=min_row["Country"],
+                population=int(min_row["Population"])
+            ),
+            avg_population=avg_population
+        )
+    except HTTPException as http_err:
+        # Log and re-raise HTTP-specific exceptions
+        logger.error(f"HTTP exception occurred: {http_err.detail}")
+        raise http_err
+    except Exception as e:
+        # Handle unexpected errors
+        logger.error(f"Unexpected error occurred while processing continent: {continent_name} | Error: {e}")
+        raise HTTPException(status_code=500, detail="An unexpected error occurred while processing your request.")

dockerfile

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+# Read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
+# you will also find guides on how best to write your Dockerfile
+
+FROM python:3.9
+
+RUN useradd -m -u 1000 user
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
+
+WORKDIR /app
+
+COPY --chown=user ./requirements.txt requirements.txt
+RUN pip install --no-cache-dir --upgrade -r requirements.txt
+
+COPY --chown=user . /app
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]