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import datetime
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import os.path
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import requests
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def get_weather_json(lat, lon):
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"""
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fetches weather from the Norwegian meteorological institute
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for a given latitude and longitude. Returns an object with a
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3-day forecast with morning, afternoon, evening and overnight
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periods. NOTE: This is not tidied up. Use get_forecast for
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nicer formatted stuff.
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"""
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url = "https://api.met.no/weatherapi/locationforecast/1.9/.json"
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params = { "lat": lat, "lon": lon }
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# https://api.met.no/weatherapi/locationforecast/1.9/.json?lat=52.50639&lon=13.4063
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resp = requests.get(url=url, params=params)
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return resp.json()
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def get_forecast(lat, lon):
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"""
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returns a list of forecast dicts:
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forecast = { "fromtime": datetime, "totime": datetime,
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"symbol": "pathto.svg", "mintemp": "12.7",
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"maxtemp": "16.8", "period": "Morning"}
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"""
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thisdir = os.path.dirname(os.path.abspath(__file__))
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periods = {6: "Morning", 12: "Afternoon", 18: "Evening", 0: "Night"}
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# Berlin - "52.5", "13.4"
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w = get_weather_json(lat, lon)
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forecasts = []
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for t in w["product"]["time"]:
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# need to strip the trainling 'Z' char which indicates UTC
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fr = datetime.datetime.fromisoformat(t["from"][:-1])
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to = datetime.datetime.fromisoformat(t["to"][:-1])
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dtdelta = datetime.date.today() - fr.date()
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if dtdelta == datetime.timedelta(days=0):
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day_of = "Today"
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elif dtdelta == datetime.timedelta(days=-1):
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day_of = "Tomorrow"
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else:
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days = ("Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday")
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day_of = days[fr.weekday()]
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if fr.hour not in (0, 6, 12, 18):
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continue
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if(to-fr == datetime.timedelta(hours=6)):
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mintemp = t["location"]["minTemperature"]["value"]
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maxtemp = t["location"]["maxTemperature"]["value"]
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symbol = t["location"]["symbol"]["id"].lower()
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png = symbol
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if fr.hour in (18, 0):
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symbol += "-night.svg"
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png += "-night.png"
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else:
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symbol += ".svg"
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png += ".png"
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icon = os.path.join(thisdir, "weather_icons", symbol)
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png = os.path.join(thisdir, "weather_icons", png)
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forecast = {"fromtime": fr, "totime": to, "symbol": icon,
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"mintemp": mintemp, "maxtemp": maxtemp, "png": png,
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"period": periods[fr.hour], "day": day_of}
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forecasts.append(forecast)
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return forecasts
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if __name__ == "__main__":
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from pprint import pprint
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pprint(get_forecast("52.5","13.4"))
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