Running the Python Flask API framework
If you want a fast light weight API, then go for Flask. Flask, is a popular micro web framework written in Python, it is one of the tools that enables light weight API communication.
Setting the Stage: Installing Python and Pip
Before installing Flask, we need to check some points. When using Flask, it’s crucial to have Python installed on your system, as Flask is a Python-based framework it needs Python to run.
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Kali Linux and Ubuntu 22.04, both being Linux distributions, usually have Python pre-installed. However, it’s always good to check and ensure that you have the latest versions installed. We will also be using ‘pip’, this is a Python package installer, that we will use to install Flask.
Verifying Python Installation
- Open your terminal.
- If Python is installed, you’ll see the version number.
Installing or Updating Python
- If for some weird reason Python is not installed or you need a different version, use the command
sudo apt-get install python3.
- Update your package list with
sudo apt-get update.
- Install pip using
sudo apt-get install python3-pip.
Installing Flask: The Main Event
Now that Python and pip are ready, installing Flask is straightforward.
- Open your terminal.
pip install Flask.
- This command downloads and installs Flask along with its dependencies.
Verifying Flask Installation
After installing Flask, it’s a good practice to verify the installation.
pythonin the terminal to enter Python’s interactive mode.
- Import Flask by typing
from flask import Flask.
- If no errors appear, Flask is installed correctly.
Creating Your First Flask Application
Let’s put Flask to use by creating a simple web application.
- Create a directory for your project.
- Navigate to this directory in the terminal.
- Create a new Python file, for example,
Writing the Application
app.pyin a text editor.
- Write the following basic Flask application:
from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello, Cyberwarzone World!' if __name__ == '__main__': app.run(debug=True)
This code creates a simple web server that returns “Hello, Cyberwarzone World!” when accessed.
Running Your Flask Application
- In the terminal, navigate to your project directory.
- Run the application with
- Open a web browser and visit
- You should see “Hello, Cyberwarzone World!” displayed.
Troubleshooting Common Issues
While installing Flask is generally straightforward, you might encounter some issues. Common problems include:
- Ensure all dependencies are installed with
pip install -r requirements.txtif you have a requirements file.
sudobefore commands if you encounter permission errors.
Python Version Conflicts
- Ensure you’re using the correct Python version. Use
pythonif your system defaults to Python 2.