update_weather.py

# The Python script that gets the weather from the Dark Sky API
# and writes it to the epaper.
# If it runs into any problems it should fail gracefully.

import os
from datetime import date, datetime

from darksky import forecast
from papirus import PapirusComposite

LEXINGTON = 42.4430, -71.2290

try:
    file = open("/home/pi/dark_sky_api_key")
    key = file.read().rstrip()
    print(key)
    if not key:
        raise Exception("DarkSky API Key file not found. Create a text file called dark_sky_api_key with the key inside it in the /home/pi directory and try again.")

    ''' Possible lexington.daily.icon values:
    clear-day, clear-night, rain, snow, sleet, wind, fog, cloudy, partly-cloudy-day, or partly-cloudy-night.'''

except :
    raise

os.chdir("/home/pi/rp.weather")

def format_temp(s):
    return str("{:.0f}".format(s))+u"\u00b0"


def update_weather():
    try:

        textNImg = PapirusComposite(False)
        # os.system("sudo hwclock --hctosys")
        weekday = date.today()
        print(key)
        with forecast(key, *LEXINGTON) as lexington:
            long_date_name = date.strftime(weekday, '%A, %b %d')
            prefix = "./assets/icons/"
            path = prefix + lexington.currently.icon + ".bmp"
            low = None
            high = None
            for hour in lexington.hourly[6:21]:
                print(hour.temperature)
                if low is None or hour.temperature < low:
                    low = hour.temperature
                if high is None or hour.temperature > high:
                    high = hour.temperature
            textNImg.AddText(long_date_name, 10, 0, size=22, Id="Day Name")
            try:
                textNImg.AddImg(path, 10, 25, (90,90), Id="Icon")
            except:
                textNImg.AddText(lexington.daily[0].icon, 10,25, Id="Icon")
            precipSummary = getattr(lexington.daily[0], "precipType", None)
            if hasattr(lexington.daily[0], "precipAccumulation"):
                precipSummary += ": " + "{0:.1f}".format((lexington.daily[0].precipAccumulation)) + '"'
            if precipSummary:
                chance = "{0:.0%}".format(lexington.daily[0].precipProbability)
                precipSummary = " ".join([chance, precipSummary.capitalize()])
                offset = len(precipSummary) * 5
                textNImg.AddText(precipSummary, 185 - offset, 35, size=15, Id="Precipitation")


            textNImg.AddText(format_temp(low) + "-" + format_temp(high), 110, 65, size=35, Id="TempRange")
            textNImg.AddText(lexington.daily[0].summary, 10, 120, size=15, Id="Forecast")
            textNImg.AddText(datetime.now().strftime("%I:%M%p"), 10, 164, size=10, Id="Time")
            textNImg.AddText("Powered by Dark Sky", 145, 164, size=10, Id="Attribution")
            textNImg.WriteAll()
    except:
        textNImg.AddText("Error reaching Dark Sky API", 10, 10, Id="Error")
        textNImg.AddText("{0}".format(weekday), 10, 60, Id="Date")
        textNImg.WriteAll()


if __name__ == "__main__":
    update_weather()