Flask is a popular micro web framework for Python. It is a lightweight framework that allows you to build web applications quickly and easily. Flask is easy to get started with and has a simple, easy-to-use API. It is often used for building simple, single-page web applications or for building the back-end of more complex applications. Flask is also extensible, meaning that you can add additional functionality to your Flask application by using a variety of plugins. To learn more about Flask and how to use it, you can check out the Flask documentation.
To run Flask code in Python, you will need to have Python installed on your computer. Flask is a Python web framework, so you will also need to have Flask installed in your environment. You can do this by running pip install Flask in your terminal.
In addition to Python and Flask, you will also need a text editor to write your Flask code. There are many text editors available, such as Sublime Text or Atom.
Once you have these prerequisites installed and set up, you are ready to start writing Flask code in Python. You can learn more about Flask and how to use it by reading the Flask documentation, or by following tutorials and examples online.
Here is the example:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return 'Hello, World!'
This is a simple example of Flask code in Python. The code creates a Flask app and defines a route for the default URL (‘/’) which returns the string ‘Hello, World!’.
To run this code, you will need to have Flask installed in your environment. You can do this by running pip install Flask in your terminal. Then, you can run the code by navigating to the directory where the file is saved and running python filename.py, where filename.py is the name of the file containing the Flask code. This will start the Flask development server, and you can access the app by going to http://127.0.0.1:5000/ in your web browser.
To create multiple pages in a Flask app in Python, you can use the @app.route decorator to define multiple routes for different URLs. For example:
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
return 'This is the home page.'
@app.route('/about')
def about():
return 'This is the about page.'
@app.route('/contact')
def contact():
return 'This is the contact page.'
if __name__ == '__main__':
app.run()
In this code, the @app.route decorator is used to define three different routes for the URLs ‘/’, ‘/about’, and ‘/contact’. Each of these routes has a corresponding function that returns a string with the content for the page.
To access these pages in your Flask app, you can go to http://127.0.0.1:5000/ to access the home page, http://127.0.0.1:5000/about to access the about page, and http://127.0.0.1:5000/contact to access the contact page.
You can learn more about routing in Flask by reading the Flask documentation or by following tutorials and examples online.