🎵 mahler

Web browser automation wrapper.

About

mahler is a web browser automation wrapper that offers a standard API regardless of what automation suite is being used.

This allows for swapping between automation solutions (playwright, selenium) without having to rewrite the actual browser control code.

mahler is named after Gustav Mahler, a 19th century composer that wrote some sweet bass solos.

Documentation

See the full documentation.

Quickstart

Run pip install mahler to install package.

Let's launch a browser, visit a site, and click the first link on the page.

from mahler import Controller


controller = Controller(
    "playwright",
    "chrome",
    headless=False,
)
controller.goto("https://example.com")
link = controller.query_selector_all("a")
link.click()

Nice! Now let's change 1 line of code to do it in a different automation suite.

from mahler import Controller

controller = Controller(
    "selenium",  # Changed
    "chrome",
    headless=False,
)
controller.goto("https://example.com")
link = controller.query_selector_all("a")
link.click()

A slightly more involved example. Let's login to a website! (Don't worry, these aren't real credentials.)

from mahler import Controller

controller = Controller(
    "selenium",
    "firefox",
    headless=False,
)
controller.goto("https://www.scrapethissite.com/login/")
email_field = controller.query_selector("input#email")
email_field.type_on("jeanluc@ufop.org")
password_field = controller.query_selector("//input[@id='password']")
password_field.type_on("makeitso", delay=0.05)
login_button = controller.query_selector("input[type='submit']")
login_button.click()

Let's change 2 arguments to do it in a different automation suite with a different browser type.

from mahler import Controller

controller = Controller(
    "playwright",  # Changed
    "chrome",  # Changed
    headless=False,
)
controller.goto("https://www.scrapethissite.com/login/")
email_field = controller.query_selector("input#email")
email_field.type_on("jeanluc@ufop.org")
password_field = controller.query_selector("//input[@id='password']")
password_field.type_on("makeitso", delay=0.05)
login_button = controller.query_selector("input[type='submit']")
login_button.click()

To Do

• Expand fingerprint dataclass and usage to capture and apply full browser fingerprint.
• Add some blackbox functional tests for browser engines.
• Async browser support. Selenium doesn't have a native async implementation and selenium-async is no longer maintained.
• Support request interception. selenium-wire is no longer maintained.
• Support mokr when it is fully released.