main.py

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.properties import ListProperty
from kivy.logger import Logger

from datetime import datetime

from api_key import API_KEY
from rest import RESTConnection


UNL_LATITUDE = 40.8207
UNL_LONGITUDE = -96.7005
UNITS = 'imperial'


def to_human_readable_time(timestamp):
    return datetime.fromtimestamp(timestamp).strftime('%A %I:%M %p')


def format_forecast_record(record):
    try:
        time = to_human_readable_time(record['dt'])
        description = ', '.join(condition['description'] for condition in record['weather'])
        temperature = record['main']['temp']
        humidity = record['main']['humidity']
        feels_like = record['main']['feels_like']
        return \
            f'{time}: {description}, {temperature:.1f} degrees F, {humidity:.0f}% humidity, ' + \
            f'feels like {feels_like:.1f} degrees F'
    except KeyError:
        return '[invalid forecast record]'


class Record(Label):
    pass


class Records(BoxLayout):
    records = ListProperty([])

    def rebuild(self):
        self.clear_widgets()
        for record in self.records:
            self.add_widget(Record(text=record))

    def on_records(self, _, __):
        self.rebuild()


class RestApp(App):
    records = ListProperty([])

    def load_records(self):
        self.records = []
        connection = RESTConnection('api.openweathermap.org', 443, '/data/2.5')
        connection.send_request(
            'weather',
            {
                'appid': API_KEY,
                'lat': UNL_LATITUDE,
                'lon': UNL_LONGITUDE,
                'units': UNITS,
            },
            None,
            self.on_records_loaded,
            self.on_records_not_loaded,
            self.on_records_not_loaded
        )

    def on_records_loaded(self, _, response):
        self.records = [format_forecast_record(response)]

    def on_records_not_loaded(self, _, error):
        self.records = ['[Failed to load records]']
        Logger.error(f'{self.__class__.__name__}: {error}')


if __name__ == '__main__':
    app = RestApp()
    app.run()