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Weather Forecast App in Python

Building a Weather Forecast App in Python

Building a Weather Forecast App in Python

Weather forecasting is an essential part of our daily lives, helping us plan our activities. In this article, we'll walk through the process of building a simple weather forecast app using Python. We’ll use the OpenWeatherMap API to get real-time weather data and display it in a user-friendly format.



Prerequisites

Before we start, make sure you have the following:

  • Python installed on your machine.
  • An API key from OpenWeatherMap (you can sign up for a free account to get one).
  • Flask or Tkinter (depending on whether you want a web-based or GUI-based app).

Step 1: Setting Up the Project

First, let's set up a basic Python project. Create a new directory for your project and navigate into it:

mkdir weather_app
cd weather_app

Next, create a new Python file named app.py where we will write our code:

touch app.py

Step 2: Installing Required Packages

We need to install some Python packages to work with APIs and handle HTTP requests. If you're using Flask, you'll also need to install it:

pip install requests Flask

Step 3: Writing the Python Code

In your app.py file, start by importing the necessary libraries:

import requests
from flask import Flask, render_template, request

Now, let's define the basic structure of our Flask app and set up a route to handle the weather data:

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def home():
    weather_data = None
    if request.method == 'POST':
        city = request.form.get('city')
        api_key = 'your_api_key_here'
        url = f'http://api.openweathermap.org/data/2.5/weather?q={city}&appid={api_key}&units=metric'
        response = requests.get(url)
        weather_data = response.json()
    return render_template('index.html', weather=weather_data)

Step 4: Creating the HTML Template

Create an index.html file in a new directory named templates. This file will display the weather information:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Weather Forecast</title>
</head>
<body>
    <h1>Weather Forecast</h1>
    <form method="post">
        <input type="text" name="city" placeholder="Enter city name" required>
        <button type="submit">Get Weather</button>
    </form>

    {% if weather %}
    <h2>Weather in {{ weather['name'] }}</h2>
    <p>Temperature: {{ weather['main']['temp'] }}°C</p>
    <p>Description: {{ weather['weather'][0]['description'] }}</p>
    {% endif %}
</body>
</html>

Step 5: Running the App

Finally, run your Flask app by executing the following command in your terminal:

python app.py

Visit http://localhost:5000 in your browser, and you'll be able to see your weather forecast app in action!

Conclusion

In this article, we built a simple weather forecast app using Python and Flask. This project demonstrates how easy it is to interact with APIs in Python and create user-friendly web applications. You can extend this project by adding more features, such as a weather forecast for multiple days, or even integrating it into a larger project.

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