---
title: "Using PKI Express on Python"
description: "Using PKI Express on Python with the Flask sample project on GitHub, which also uses Web PKI, and the steps to run it."
canonical: "https://docs.lacunasoftware.com/en-us/articles/pki-express/python"
locale: "en"
product: "PKI Express"
last_updated: "2026-10-12"
---

# Using PKI Express on Python

This article describes how to use [PKI Express](https://docs.lacunasoftware.com/en-us/articles/pki-express) on Python

## Sample project

The sample project shows the usage of PKI Express together with the [Web PKI](https://docs.lacunasoftware.com/en-us/articles/web-pki) browser component
on a **Python** project. It is hosted on GitHub:

https://github.com/LacunaSoftware/PkiSuiteSamples/tree/master/python/flask

> **Note**
>
> If you are using a previous version of Ptyhon, please [contact us](https://www.lacunasoftware.com/en/home/purchase).

### Running the project

1. [Install PKI Express](https://docs.lacunasoftware.com/en-us/articles/pki-express/setup)
1. [Download the project](https://github.com/LacunaSoftware/PkiSuiteSamples/archive/master.zip) or clone the [repository](https://github.com/LacunaSoftware/PkiSuiteSamples.git)
1. In a command prompt, navigate to the folder `python/flask` and run the command `pip install -r requirements.txt` to download the dependencies
1. Define the `FLASK_APP` environment variable to define the name of app the should be run: `FLASK_APP=sample`
1. Run the web application: `flask run` or `python -m flask run`
1. Access the URL: [http://localhost:5000](http://localhost:5000)

Optionally, you can create and activate a "virtualenv" to avoid mixing library versions:

```sh
virtualenv <venv>
source bin/activate (on Windows: ./<venv>/Scripts/activate)
```

### PyPi package

In order to use PKI Express on Python, you must includ the PyPi package [pkiexpress](https://pypi.org/project/pkiexpress)

To add it to your project, add the line below to your `requirements.txt` file:

```text
pkiexpress==1.10.4
```

After that, do a `pip install -r requirements.txt` to download the package and its dependencies.

The package is open-source, hosted on [GitHub](https://github.com/LacunaSoftware/PkiExpressPython). Feel free to fork it if you need to make any customizations, and even submit an *pull request*.