fetch_data.py

import requests


def fetch_data(url):

    try:
        response = requests.get(url)
        ret = response.json()
        response.raise_for_status()
        
        return ret
    except (ValueError, requests.exceptions.RequestException) as e:
        print({'error': e, 'url': url})


def fetch_forecast(city_id='2643743'):
    url = "http://api.openweathermap.org/data/2.5/forecast?id=%s&APPID=34892dee8e50ad1f088d6d9a6271c58b" % city_id
    ret = fetch_data(url)
    if 'cod' in ret and ret['cod'] == '200':
        return ret['list']

    return None


def get_24h_forecast_temps(city_id='2643743'):
    forecasts = fetch_forecast(city_id)

    if forecasts is None:
        return None
    # api gives us every 3 hour until 5 days
    forecasts = forecasts[:9]
    ret = {}
    for forecast in forecasts:
        # convert to Celsius
        forecast['main']['cel_temp'] = round((float(forecast['main']['temp']) - 273.15), 2)
        ret[forecast['dt']] = forecast
    return ret