74 lines
2.8 KiB
Python
74 lines
2.8 KiB
Python
from datetime import date
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import requests
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from decimal import Decimal
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# Import your database model and the session from your database configuration
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from app.models.auto import Auto_Temp
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from database import session
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def Average(lst):
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"""Calculates the average of a list of numbers."""
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return sum(lst) / len(lst)
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def fetch_and_store_daily_temp() -> bool:
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"""
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Fetches the current day's weather for Worcester, MA, calculates the
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Heating Degree Day (HDD), and stores it in the database if it doesn't already exist.
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Returns:
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bool: True if the temperature is successfully fetched and stored (or already exists),
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False if an error occurs.
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"""
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# 1. Check if the temperature for today already exists in the database
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today = date.today()
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if session.query(Auto_Temp).filter(Auto_Temp.todays_date == today).first():
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print(f"Temperature for {today} already exists in the database. Skipping fetch.")
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return True
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# 2. If it doesn't exist, fetch it from the API
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print(f"Fetching temperature for {today} from OpenWeatherMap...")
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try:
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# API key and location
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api_key = '21648d8c8d1a4ae495ace0b7810b4d36'
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location = 'Worcester,US'
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# Make request to OpenWeatherMap Current Weather API with imperial units for Fahrenheit
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url = f"http://api.openweathermap.org/data/2.5/weather?q={location}&appid={api_key}&units=imperial"
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response = requests.get(url)
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response.raise_for_status() # Raise an error for bad status codes
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data = response.json()
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# Extract temperatures in Fahrenheit
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main = data.get('main', {})
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current_temp = Decimal(main.get('temp', 0))
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low_temp = Decimal(main.get('temp_min', 0))
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high_temp = Decimal(main.get('temp_max', 0))
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# Calculate average temperature and Heating Degree Days (HDD)
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avg_temp = (low_temp + high_temp) / 2
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# HDD is based on a baseline of 65°F. It cannot be negative for heating calculations.
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degree_day = max(Decimal(0), 65 - avg_temp)
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# 3. Create a new database object
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add_new_temp = Auto_Temp(
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temp=current_temp,
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temp_max=high_temp,
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temp_min=low_temp,
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temp_avg=round(avg_temp, 2),
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degree_day=round(degree_day),
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todays_date=today
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)
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# 4. Add the new record to the session (it will be committed by the calling function)
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session.add(add_new_temp)
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print(f"Successfully fetched and staged temperature for {today}.")
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return True
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except Exception as e:
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print(f"An error occurred while fetching weather data: {e}")
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# Make sure to rollback the session in case of a partial failure
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session.rollback()
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return False
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