app.py

from flask import request, Flask
import requests
import json

app = Flask(__name__)

KEY = "be1ae457a890894c4854d1796e11012f"

@app.route("/weather/", methods=['GET'])
def weather():
    """get city name and show weather
    """
    # get username from the url params
    cityname = request.args.get('cityname', default=None, type=str)

    response = ""

    if cityname:
        url = f"https://api.openweathermap.org/data/2.5/weather?q={cityname}&appid={KEY}&units=metric"
        res = requests.get(url)
        res = json.loads(res.text)
        try:
            response = f"<h1>The current weather in {cityname} is {res['main']['temp']} °C</h1>"
        except:
            response = "<h1>city wasn't found :(</h1>"
    else:
        response = "<h1>city not found</h1>"

    # return the response
    return response


@app.route('/')
def index():
	return ('<h1>All is working !</h1>')

if __name__ == "__main__":
	app.run()

# while True:
#         city_name = input("enter city name: ").strip()
#         if city_name == 'q':
#                 break
#         params = {
#         "city_name":city_name
#         }
#         url = f"https://api.openweathermap.org/data/2.5/weather?q={city_name}&appid={KEY}&units=metric"
#         res = requests.get(url)
#         res = json.loads(res.text)
#         print(str(res['main']["temp"]) + " °C")