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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsUse Playwright for a new Python end-to-end test or browser-automation project when you want one modern API with synchronous and asynchronous interfaces. Use Selenium when your team already depends on WebDriver infrastructure, Selenium Grid, or an established Selenium suite. Neither tool is a proven universal speed or reliability winner in the documentation reviewed. Choose according to the browsers and operating systems you must support, your async needs, and the workflow you already maintain.
This guide installs both options, shows runnable Python examples, explains the trade-offs, and covers the failures that most often stop a first run.
What browser automation in Python does
Browser automation drives a real browser to open pages, locate elements, enter text, click controls, wait for page state, inspect results, and capture evidence. It is useful for end-to-end tests, regression checks, repetitive workflows, data collection where permitted, and generating screenshots or PDFs.
Playwright’s Python documentation describes the library as a general-purpose tool for automating web applications with both sync and async Python APIs. It also says, “Playwright was created specifically to accommodate the needs of end-to-end testing.” Selenium’s Python bindings automate browsers through the WebDriver protocol.
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Choose Playwright or Selenium
| Question | Prefer Playwright when… | Prefer Selenium when… |
|---|---|---|
| Project type | You are starting a new end-to-end test or browser workflow. | You are extending an existing WebDriver-based suite. |
| Python API | You want either a synchronous API or an asyncio-compatible API from the same library. | Your codebase already uses Selenium’s WebDriver model and conventions. |
| Browsers | You need documented Chromium, Firefox, and WebKit coverage, with optional branded Chrome or Edge channels subject to environment and enterprise-policy constraints. | You need Selenium’s documented browser/platform set, including Chrome, Edge, Firefox, Safari, WebKitGTK, or WPEWebKit, subject to the current environment. |
| Test runner | You write pytest end-to-end tests and can use Playwright’s pytest plugin. | Your organization already has Selenium fixtures, Grid, reporting, or driver-management practices. |
| Driver management | You install the Playwright package and its matching browser binaries. | Modern Selenium uses Selenium Manager for driver installation on most supported platforms and browsers. |
Browser support and installation behavior change with releases, operating systems, browser policies, and CI images. Check the current official Playwright and Selenium documentation before pinning a deployment. Do not select a library based on an unsupported claim that it is always faster.
Install Playwright
- Create and activate a virtual environment:
python -m venv .venv, then activate.venvScriptsactivateon Windows orsource .venv/bin/activateon macOS and Linux. - Install the Python package:
pip install playwright. - Install the browser binaries with the Playwright CLI:
playwright install.
The package and browser-install steps are separate. Playwright browser versions track library releases, so after upgrading Playwright you may need to run playwright install again. In restricted CI environments, cache the installed browsers or install them during image creation.
First Playwright script (synchronous)
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
browser = p.chromium.launch(headless=True)
page = browser.new_page(viewport={"width": 1280, "height": 800})
page.goto("https://example.com", wait_until="domcontentloaded")
print(page.title())
print(page.locator("h1").inner_text())
page.screenshot(path="example.png", full_page=True)
browser.close()sync_playwright is convenient for scripts and synchronous test code. Keep the browser inside the context manager so processes close even when the script exits normally.
Async Playwright
import asyncio
from playwright.async_api import async_playwright
async def main():
async with async_playwright() as p:
browser = await p.chromium.launch(headless=True)
page = await browser.new_page()
await page.goto("https://example.com", wait_until="domcontentloaded")
print(await page.title())
await page.screenshot(path="example-async.png", full_page=True)
await browser.close()
asyncio.run(main())Use the async API when the rest of your service already uses asyncio. Do not call synchronous Playwright APIs from an active event loop; choose one style per execution path.
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Playwright with pytest
For end-to-end tests written with pytest, Playwright recommends its pytest plugin. Install the test dependencies in your project, then use the supplied page fixture:
def test_example_title(page):
page.goto("https://example.com")
assert page.title() == "Example Domain"
Keep assertions focused on user-visible outcomes. Prefer locators that describe accessible roles, labels, or stable test IDs over brittle absolute XPath expressions.
Install and use Selenium
- Activate the same kind of virtual environment used for any Python project.
- Install Selenium:
pip install selenium. - Create a WebDriver for the browser you need. Current Selenium documentation lists Python 3.10+ and support for Chrome, Edge, Firefox, Safari, WebKitGTK, and WPEWebKit.
Modern Selenium includes Selenium Manager, which handles driver installation for most supported platforms and browsers. A driver still mediates between your Python code and the selected browser; do not assume that every unusual browser build or locked-down enterprise machine can be configured automatically.
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First Selenium script
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
options = webdriver.ChromeOptions()
options.add_argument("--headless=new")
options.add_argument("--window-size=1280,800")
driver = webdriver.Chrome(options=options)
try:
driver.get("https://example.com")
heading = WebDriverWait(driver, 10).until(
EC.visibility_of_element_located((By.TAG_NAME, "h1"))
)
print(driver.title)
print(heading.text)
driver.save_screenshot("example-selenium.png")
finally:
driver.quit()The try/finally is important: quit() closes the browser and the WebDriver session even when an assertion or element lookup fails.
Build reliable automation
Wait for a condition, not an arbitrary sleep
Pages render in stages. In Playwright, use locator actions and navigation options such as wait_until; in Selenium, use WebDriverWait with an expected condition. A fixed sleep can be too short on a busy runner and unnecessarily slow on a fast one.
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Use stable selectors
- Prefer an accessible role and name, a label, or a deliberate test ID.
- Use CSS selectors tied to stable attributes rather than generated class names.
- Keep selectors close to the action so a failure identifies the broken assumption.
Control test state
Start each test with predictable data, isolate accounts where possible, and clean up records you create. Reusing one browser can reduce startup time, but sharing pages or cookies between unrelated tests creates order-dependent failures.
Configure headed runs for diagnosis
Run headed locally when a failure is visual. Capture a screenshot, page URL, console output, and relevant HTML at the point of failure. In CI, keep headless execution and publish those artifacts from failed jobs.
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Browser and platform decisions
Playwright’s Python documentation covers Chromium, Firefox, and WebKit on Windows, Linux, and macOS. It also documents branded Chrome and Edge channels; enterprise policies and the installed browser environment can affect those channels. Selenium’s supported list includes additional platform-specific engines, but the exact combination depends on the current Selenium release and machine.
Make a support matrix before choosing:
- Which operating systems run locally and in CI?
- Do you need Chromium, Firefox, WebKit, Safari, or a branded Chrome/Edge channel?
- Must the suite run inside an existing Selenium Grid or WebDriver service?
- Does the application already expose asyncio-based infrastructure?
- Will pytest fixtures, reports, and parallelization determine the test runner?
Troubleshooting common failures
Playwright says an executable is missing
Cause: The Python package is installed but browser binaries are not. Fix: Run playwright install with the same environment and user that runs the script. Re-run it after a library upgrade if the browser revision changed.
Playwright cannot start in CI
Cause: The image lacks required system libraries, has a restricted sandbox, or blocks browser processes. Fix: Use a supported base image, install the dependencies required by that image, and review the runner’s sandbox and process policy. Reproduce with a headed or locally equivalent environment before changing test logic.
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Selenium reports a driver or browser mismatch
Cause: The browser, driver, or Selenium Manager environment is incompatible. Fix: Record the browser and Selenium versions, update Selenium, verify that the browser is on PATH or discoverable, and check the current Selenium Manager guidance. Avoid copying an old manual-driver recipe into a modern installation without a reason.
An element is present but not interactable
Cause: The element is hidden, covered by an overlay, outside the viewport, or not yet ready. Fix: Wait for visibility or an enabled state, dismiss the legitimate application overlay, scroll only when necessary, and capture a screenshot to confirm what the browser displayed.
Tests pass locally but fail intermittently
Cause: Shared state, timing assumptions, animations, network variance, or an unstable selector. Fix: Isolate data, replace sleeps with condition-based waits, disable or await animations where appropriate, and retain failure artifacts. Do not simply increase every timeout.
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Operational and cost notes
Launching a browser is substantially more work than making an HTTP request, so reuse a browser process where your isolation model permits it and create separate contexts or sessions for independent tests. Keep browser binaries and Python dependencies pinned in CI, but schedule updates so security fixes are not missed. Parallel workers reduce wall-clock time while increasing CPU, memory, browser-process, and test-data pressure; measure your own suite rather than assuming a fixed worker count.
For Selenium, account for the browser, WebDriver, and any Grid nodes in your infrastructure. For Playwright, account for the downloaded browser binaries and their cache in build images. The libraries themselves do not establish a universal cost, speed, or reliability ranking; your browser matrix and environment determine the result.
Frequently Asked Questions
Can I use Playwright and Selenium in the same Python project?
Yes, but isolate their fixtures, browser processes, and dependency choices. Mixing them in one test usually adds complexity without providing a benefit.
Which library should a beginner learn first?
For a new end-to-end project, start with Playwright’s documented Python workflow. If your workplace already standardizes on WebDriver, learn Selenium first so your code fits the existing infrastructure.
Do I need a visible desktop to run browser automation?
No. Both examples can run headlessly. A headed run is useful when diagnosing a visual or environment-specific failure.
What Python version does Selenium’s current API documentation list?
It lists Python 3.10 and newer; verify the current support table before choosing a future Python release.
Quick Recap
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