data_fetcher.py

import pandas as pd

def get_hydrogen_data():
    """
    Simulates fetching data from an open-source model.
    Reads local dataset electrolysis_data.csv as a fallback.
    """
    try:
        df = pd.read_csv("electrolysis_data.csv")
        return df
    except Exception as e:
        print(f"⚠️ Error loading dataset: {e}")
        return None