Welcome to Pylenium

Web Test Automation for Python

The mission is simple

Bring the best of Selenium, Cypress and Python into one package.

This means:

  • Automatic waiting and synchronization

  • Quick setup to start writing tests

  • Easy to use and clean syntax for amazing readability and maintainability

  • Automatic driver installation so you don't need to manage drivers

  • Leverage the awesome Python language

  • and more!

Test Example

Let's use this simple scenario to show the difference between using Selenium and Pylenium:

  1. Visit the QA at the Point website: https://qap.dev

  2. Hover the About link to reveal a menu

  3. Click the Leadership link in that menu

  4. Assert Carlos Kidman is on the Leadership page

Using Pylenium
def test_carlos_is_on_leadership(py):
    assert py.contains("Carlos Kidman")
The same test using Selenium
# Define your setup and teardown fixture
def driver():
    driver = webdriver.Chrome()
    yield driver

def test_carlos_is_on_leadership(driver):
    wait = WebDriverWait(driver, timeout=10)

    # Hover About link
    about_link = driver.find_element(By.CSS_SELECTOR, "a[href='/about']")
    actions = ActionChains(driver)

    # Click Leadership link in About menu
    wait.until(EC.element_visible(By.CSS_SELECTOR, "a[href='/leadership'][class^='Header-nav']")).click()

    # Check if 'Carlos Kidman' is on the page
    assert wait.until(lambda _: driver.find_element(By.XPATH, "//*[contains(text(), 'Carlos Kidman')]"))


I teach courses and do trainings for Selenium, Cypress, and Playwright, but Selenium, out of the box, feels clunky. When you start at a new place, you almost always need to "setup" the framework from scratch all over again. Instead of getting right to creating meaningful tests, you end up spending most of your time building a custom framework, maintaining it, and having to teach others to use it.

Also, many people blame Selenium for bad or flaky tests. This usually tells me that they have yet to experience someone that truly knows how to make Selenium amazing! This also tells me that they are not aware of the usual root causes that make Test Automation fail:

  • Poor programming skills, test design, and practices

  • Flaky applications

  • Complex frameworks

What if we tried to get the best from both worlds and combine it with a fantastic language?

Selenium has done an amazing job of providing W3C bindings to many languages, making scaling a breeze. W3C is the standard for the web, so leveraging it just makes sense.

Cypress has done an amazing job of making the testing experience more enjoyable - especially for beginners. It's easy to start with and the API is readable and flows nicely.

Pylenium looks to bring more Cypress-like bindings and techniques to Selenium (like automatic waits) and still leverage Selenium's power along with the ease of use and power of Python.

Quick Start

If you are new to Selenium or Python, do the Getting Started steps 1-4

You can also watch the Getting Started video with Pylenium's creator, Carlos Kidman!

You don't need to worry about installing any driver binaries like chromedriver. Pylenium does this all for you automatically :)

1. Install pyleniumio

Terminal $
pip install pyleniumio


pipenv install pyleniumio


poetry add pyleniumio

2. Initialize Pylenium

Terminal $
pylenium init

Execute this command at your Project Root

This creates three files:

  • conftest.py - This has the fixtures needed for Pylenium

  • pylenium.json - This is the configuration file for Pylenium

  • pytest.ini - This is the configuration file for pytest

By default, Pylenium uses the Chrome browser. You have to install Chrome or update the pylenium.json file to use the browser of your choice.

3. Write a test

Create a directory called tests and then a test file called test_google.py

Define a new test called test_google_search

def test_google_search(py)

Pylenium uses pytest as the Test Framework. You only need to pass in pyto the function!

Now we can use Pylenium Commands to interact with the browser.

from pylenium.driver import Pylenium

def test_google_search(py: Pylenium):
    assert py.should().contain_title('puppies')

Some IDEs, like PyCharm, auto-detect pytest fixtures and provide intellisense and autocomplete.

4. Run the Test

This will depend on your IDE, but you can always run tests from the CLI:

Terminal $ (venv)
pytest tests/test_google.py

You're all set! You should see the browser open and complete the commands we had in the test :)

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