How to install Flask on Debian 12
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To Install Flask On Debian 12
Introduction
Flask is a free and open-source microweb framework for Python designed to help developers build secure, scalable, and maintainable web applications. Flask is based on Werkzeug and uses Jinja2 as a template engine.
Procedure steps
Step 1: Check the OS version by using the below command
root@linuxhelp:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm
Step 2: Now check the version of the python by using the below command
root@linuxhelp:~# python3 --version
Python 3.11.2
Step 3: Check the version of the pip by using the below command
root@linuxhelp:~# pip -V
bash: pip: command not found
Step 4: If pip is not installed then Install it by using the below command
root@linuxhelp:~# apt install python3-pip -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
libexpat1-dev libjs-jquery libjs-sphinxdoc libjs-underscore libpython3-dev
libpython3.11-dev python3-dev python3-setuptools python3-wheel
python3.11-dev
Suggested packages:
python-setuptools-doc
The following NEW packages will be installed:
libexpat1-dev libjs-jquery libjs-sphinxdoc libjs-underscore libpython3-dev
libpython3.11-dev python3-dev python3-pip python3-setuptools python3-wheel
python3.11-dev
0 upgraded, 11 newly installed, 0 to remove and 106 not upgraded.
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Processing triggers for man-db (2.11.2-2) ...
Step 5: After the installation, check the pip version again by using the below command
root@linuxhelp:~# pip -V
pip 23.0.1 from /usr/lib/python3/dist-packages/pip (python 3.11)
Step 6: Install the Virtualenv package by using the below command
root@linuxhelp:~# apt install python3-venv
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
python3-pip-whl python3-setuptools-whl python3.11-venv
The following NEW packages will be installed:
python3-pip-whl python3-setuptools-whl python3-venv python3.11-venv
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Step 7: Create a new python virtual environment by using the below command
root@linuxhelp:~# python3 -m venv testenv
Step 8: Once the virtual environment is created, run the below command to activate it.
root@linuxhelp:~# source testenv/bin/activate
Step 9: Now install Flask by using pip install command
(testenv) root@linuxhelp:~# pip install flask
Collecting flask
Downloading flask-3.0.3-py3-none-any.whl (101 kB)
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Collecting Werkzeug>=3.0.0
Downloading werkzeug-3.0.3-py3-none-any.whl (227 kB)
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Collecting Jinja2>=3.1.2
Downloading jinja2-3.1.4-py3-none-any.whl (133 kB)
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Collecting blinker>=1.6.2
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Collecting MarkupSafe>=2.0
Downloading MarkupSafe-2.1.5-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (28 kB)
Installing collected packages: MarkupSafe, itsdangerous, click, blinker, Werkzeug, Jinja2, flask
Successfully installed Jinja2-3.1.4 MarkupSafe-2.1.5 Werkzeug-3.0.3 blinker-1.8.2 click-8.1.7 flask-3.0.3 itsdangerous-2.2.0
Step 10: After the installation check the version of the flask by using the below command
(testenv) root@linuxhelp:~# flask --version
Python 3.11.2
Flask 3.0.3
Werkzeug 3.0.3
Step 11: Now create a simple Python code file that will import Flash to print a simple Hello message by using the below command.
(testenv) root@linuxhelp:~# vim flasktest.py
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hello, Flask!'
if __name__ == '__main__':
app.run()
Step 12: Run the file by using the python command.
(testenv) root@linuxhelp:~# python3 flasktest.py
* Serving Flask app 'flasktest'
* Debug mode: off
WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
* Running on http://127.0.0.1:5000
Press CTRL+C to quit
127.0.0.1 - - [14/May/2024 04:04:16] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [14/May/2024 04:04:16] "GET /favicon.ico HTTP/1.1" 404 -
Step 13: Now go to the browser and search the following link http:/127.0.0.1:5000
Conclusion:
We have reached the end of this article. In this guide, we have walked you through the steps required to install Flask on Debian 12. Your feedback is much welcome.
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