call openweathermap API with python3

1. Create an Account on https://home.openweathermap.org/ and create your API key, save it into config.ini:

[openweathermap]
api=7383374766289c804cbf5a68ac704491

2. create get_weather.py

import configparser
import requests
import sys

def get_api_key():
    config = configparser.ConfigParser()
    config.read('config.ini')
    return config['openweathermap']['api']

def get_weather(api_key, location):
    url = "https://api.openweathermap.org/data/2.5/weather?q={}&units=metric&appid={}".format(location, api_key)
    r = requests.get(url)
    return r.json()

def main():
    if len(sys.argv) != 2:
        exit("Usage: {} LOCATION".format(sys.argv[0]))
    location = sys.argv[1]

    api_key = get_api_key()
    weather = get_weather(api_key, location)

    print(weather['main']['temp'])
    print(weather)

if __name__ == '__main__':
    main()

3. test code:
   C:\Users\zhuby\hans>python get_weather.py Toronto
   20.2
   {‘coord’: {‘lon’: -79.42, ‘lat’: 43.7}, ‘weather’: [{‘id’: 800, ‘main’: ‘Clear’, ‘description’: ‘clear sky’, ‘icon’: ’01d’}], ‘base’: ‘stations’, ‘main’: {‘temp’: 20.2, ‘feels_like’: 18.43, ‘temp_min’: 18, ‘temp_max’: 22.78, ‘pressure’: 1020, ‘humidity’: 52}, ‘visibility’: 14484, ‘wind’: {‘speed’: 2.6, ‘deg’: 100}, ‘clouds’: {‘all’: 1}, ‘dt’: 1591637542, ‘sys’: {‘type’: 1, ‘id’: 941, ‘country’: ‘CA’, ‘sunrise’: 1591608974, ‘sunset’: 1591664262}, ‘timezone’: -14400, ‘id’: 6167865, ‘name’: ‘Toronto’, ‘cod’: 200}