python web front end framework
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title: introduction to flask: a python web front-end framework
i. overview:
a. definition:
flask is a lightweight and versatile python web framework used for building web applications. it follows the wsgi standard and is known for its simplicity and flexibility.
b. key features:
1. minimalistic: flask provides only the essentials, allowing developers the freedom to choose and integrate components as needed.
2. extensible: the framework supports a wide range of extensions for added functionalities.
3. jinja2 templating: flask uses jinja2 for templating, enabling dynamic content generation.
ii. installation:
a. prerequisites:
1. python: ensure python is installed on your system.
2. pip: use the package manager pip to install flask.
b. installation steps:
pip install flask
iii. setting up a basic flask application:
a. import flask:
python from flask import flask
b. create an app instance:
python app = flask(__name__)
c. define a route:
python @app.route('/') def hello_world(): return 'hello, world!'
d. run the app:
python if _name_ == '__main__': app.run(debug=true)
iv. templating with jinja2:
a. folder structure:
create a folder named 'templates' in the project directory to store html templates.
b. rendering html:
1. create an html file ('index.html') in the 'templates' folder.
2. modify the route function to render the html template:
```python
from flask import render_template
v. handling form submissions:
a. import flask's 'request' module:
python from flask import request
b. create a form:
1. add an html form to 'index.html'.
2. modify the route function to handle form submissions:
python @app.route('/', methods=['get', 'post']) def hello_world(): if request.method == 'post': user_name = request.form['user_name'] return f'hello, {user_name}!' return render_template('index.html')
vi. conclusion:
a. recap:
flask simplifies web development in python by offering a lightweight and flexible framework. this tutorial covered the basics of setting up a flask application, ...
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