Create a Weather app using Flask | Python

Last Updated : 17 Sep, 2019

Flask is a lightweight framework written in Python. It is lightweight because it does not require particular tools or libraries and allow rapid web development. today we will create a weather app using flask as a web framework. this weather web app will provide current weather updates of cities searched.

Basic setup :

Create a file and name it as weather.py

Linux command to create a file

touch weather.py

Now, create a folder templates with a file name index.html

Linux command to create a folder and a file

 mkdir templates && cd templates && touch index.html

The project folder will look like :

Editing files :
Use your own API key from Weather API and place it in API variable. Now edit weather.py file.

from flask import Flask, render_template, request 
  
# import json to load JSON data to a python dictionary 
import json 
  
# urllib.request to make a request to api 
import urllib.request 
  
  
app = Flask(__name__) 
  
@app.route('/', methods =['POST', 'GET']) 
def weather(): 
    if request.method == 'POST': 
        city = request.form['city'] 
    else: 
        # for default name mathura 
        city = 'mathura'
  
    # your API key will come here 
    api = api_key_here 
  
    # source contain json data from api 
    source = urllib.request.urlopen('http://api.openweathermap.org/data/2.5/weather?q =' + city + '&appid =' + api).read() 
  
    # converting JSON data to a dictionary 
    list_of_data = json.loads(source) 
  
    # data for variable list_of_data 
    data = { 
        "country_code": str(list_of_data['sys']['country']), 
        "coordinate": str(list_of_data['coord']['lon']) + ' ' 
                    + str(list_of_data['coord']['lat']), 
        "temp": str(list_of_data['main']['temp']) + 'k', 
        "pressure": str(list_of_data['main']['pressure']), 
        "humidity": str(list_of_data['main']['humidity']), 
    } 
    print(data) 
    return render_template('index.html', data = data) 
  
  
  
if __name__ == '__main__': 
    app.run(debug = True) 