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Python Flask framework building blog tutorial

王林Original: 2023-06-17 15:06:122029browse

Python Flask framework is a lightweight web application framework suitable for small to medium-sized web applications. This article will introduce how to use the Flask framework to build a simple blog application.

Prerequisites

Before you begin, you need to know the following:

Python programming language
Python virtual environment (virtualenv)
Flask Framework

If you are not familiar with the above knowledge, please study the relevant tutorials first.

Step 1: Create a virtual environment

First, we need to create a virtual environment to ensure that our application will not be affected by the local Python environment.

Open a terminal and run the following command:

virtualenv venv

This will create a virtual environment directory named "venv".

Now, we need to activate the virtual environment. Run the following command:

source venv/bin/activate

If you are prompted to install virtualenv, please use the following command to install it:

pip install virtualenv

Step 2: Install Flask

In the virtual environment, run the following command Let’s install Flask:

pip install Flask

Now that we have the Flask framework installed, we can start creating our blogging application.

Step 3: Create a Flask application

Create a new folder in the virtual environment and create the Python file "app.py" in it.

Add the following code to the file:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run(debug=True)

This is a minimal Flask application with the root route returning a simple "Hello, World!" message for testing our application Whether the program is working properly.

Step 4: Run the application

Run the application using the following command:

export FLASK_APP=app
flask run

The Flask application is now running and can be opened in the browser at http://localhost :5000/, see the "Hello, World!" message.

Step 5: Create a blog

Now we will create a simple blog. Add the following code to the app.py file:

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello, World!'

@app.route('/blog')
def blog():
    posts = [
        {'title': 'First Post', 'content': 'This is my first post.'},
        {'title': 'Second Post', 'content': 'This is my second post.'}
    ]
    return render_template('blog.html', posts=posts)

if __name__ == '__main__':
    app.run(debug=True)

In this new route, we create a list called "posts" that contains our blog posts.

We also used the render_template function to link this function with the blog.html file.

Step 6: Create Template

Now we need to create a template to display our blog posts. Create a folder called "templates" in the root directory of your application and a file called "blog.html" inside it.

Add the following code in blog.html:

<!DOCTYPE html>
<html>
<head>
    <title>Blog</title>
</head>
<body>
    {% for post in posts %}
        <h2>{{ post.title }}</h2>
        <p>{{ post.content }}</p>
    {% endfor %}
</body>
</html>

In this template, we use a for loop to iterate over the "posts" list and display the title and content of each blog post.

Step 7: Run the application

Run the application again using the following command:

export FLASK_APP=app
flask run

Now you can open http://localhost:5000/blog in your browser, See our blog post already shown.

Summary

In this article, we learned how to use Python’s Flask framework to build a simple blogging application. We cover Python virtual environments, installing the Flask framework, and creating Flask applications, routing, templates, and more. This is just a simple example, but you can extend this sample application into a more complex application.

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