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Flask is a popular Python module used for web development. It’s simple to use and great for beginners. Flask can also act as a third-party plugin or be used for creating prototypes. It’s made up of various libraries and modules to help build web applications. Flask is fully written in Python, unlike Django. Since Flask is based on Python, you need to have Python installed on your system before you can install Flask.
In this tutorial, we’ll explore how to install Flask in Python using step-by-step instructions.
You must fulfill the following prerequisites for installing Flask in Python:
You can install Flask in Python in a code editor like VS Code or PyCharm to write and manage your Flask project.
You can install Flask in Python by setting up and activating a virtual environment, then using pip to install Flask. Let’s go through the following stepwise instructions to learn how to install Flask in Python:
Let’s execute the below-given command to install the python3-venv package:
sudo apt install python3-venv
This package provides tools to create isolated Python 3 virtual environments:
Read also How to Install Python on Ubuntu
Now set up a project directory named ultahost by executing the command below:
mkdir ultahost
Let’s access the ultahost directory by running the following command:
cd ultahost
After this, we use the virtualenv command to create a new isolated Python environment named venv:
virtualenv venv
After setting up a virtual environment using virtualenv, you can activate it by running the following command:
source ./venv/bin/activate
Once the virtual environment is activated, you can proceed with the Flask installation. However, it’s recommended to check the pip version using the following command to ensure you’re using the correct version for your environment:
pip -V
If you are using an outdated PIP version, refer to this guide to upgrade the PIP to the latest version.
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Now that everything is set up, you can install Flask in Python using pip as follows:
pip install flask
Let’s open the Python interpreter by running the following command:
python
In the Python interactive shell, run the following command to import Flask:
import flask
If Flask is installed in Python, this command runs successfully without throwing any error. However, if Flask is not installed, you’ll encounter a Module not found error:
That’s all about installing Flask in Python.
Flask is a popular, lightweight Python web framework known for its simplicity and ease of use in building web applications. Installing Flask in Python is a straightforward process that involves setting up a virtual environment, ensuring the necessary prerequisites are in place, and using pip to install Flask. In this article, we explained how to install Flask in Python using step-by-step instructions.
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Flask is a micro Python web framework used to build web applications. It’s easy to use and great for beginners in web development.
Yes, since Flask is a Python module, you need to have Python installed on your system before installing Flask.
First, install the python3-venv package, then, use the virtualenv command to set up the environment and activate it to isolate your Flask project.
While it’s possible to install Flask globally, it’s highly recommended to use a virtual environment to keep your project dependencies isolated and avoid conflicts with other Python projects.
To install Flask in Python, activate your virtual environment and run the command: pip install flask
After installing Flask, you can open the Python interpreter and run import flask command. If Flask is installed correctly, no error will occur. Otherwise, you’ll see a ModuleNotFoundError.
If your pip version is outdated, you can upgrade it using the following command: pip install –upgrade pip
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