Discover AI-native insights at Testμ Conference‘25

How to use greenlet_main method in Playwright Python

Best Python code snippet using playwright-python

test_greenlet.py

...506        # This has to be an instance variable because507        # Python 2 raises a SyntaxError if we delete a local508        # variable referenced in an inner scope.509        self.glets = [] # pylint:disable=attribute-defined-outside-init510        def greenlet_main():511            try:512                getcurrent().parent.switch()513            except GreenletExit:514                self.glets.append(getcurrent())515        # Before the516        for _ in range(10):517            Greenlet(greenlet_main).switch()518        del self.glets519        self.assertEqual(sys.getrefcount(Greenlet), initial_refs)520    def test_issue_245_reference_counting_subclass_threads(self):521        # https://github.com/python-greenlet/greenlet/issues/245522        from threading import Thread523        from threading import Event524        from greenlet import getcurrent525        class MyGreenlet(greenlet):526            pass527        glets = []528        ref_cleared = Event()529        def greenlet_main():530            getcurrent().parent.switch()531        def thread_main(greenlet_running_event):532            mine = MyGreenlet(greenlet_main)533            glets.append(mine)534            # The greenlets being deleted must be active535            mine.switch()536            # Don't keep any reference to it in this thread537            del mine538            # Let main know we published our greenlet.539            greenlet_running_event.set()540            # Wait for main to let us know the references are541            # gone and the greenlet objects no longer reachable542            ref_cleared.wait()543            # The creating thread must call getcurrent() (or a few other...

greenlet_utils.py

Source:greenlet_utils.py

...24    never in other greenlets unless someone  explicitely calls25    `kill(KeyboardInterrupt)`. Apart from the later case, `KillMask`26    does not delay `KeyboardInterrupt`.27    A typical use case of `KillMask` is this:28        def greenlet_main():29            <setup>30            try:31                <body>32            finally:33                with KillMask(masked_kill_nb=1):34                    <cleanup>35    We assume this code does not run in the main greenlet. Whenever36    you use a cooperative call, you could receive an exception in37    `greenlet_main` originating from a `kill` on the executing greenlet.38    The default exception is `GreenletExit` which is a `BaseException`.39    In the exception could occur in three locations (assuming they40    all use cooperative calls):41        1. exception in <setup>: <cleanup> is not called42        2. exception in <body>: <cleanup> is called thanks to try-finally...

sync_playwright_remote.py

Source: sync_playwright_remote.py

...36            raise Error(37                """It looks like you are using Playwright Sync API inside the asyncio loop.38Please use the Async API instead."""39            )40        def greenlet_main() -> None:41            loop.run_until_complete(self._connection.run_as_sync())42            if own_loop:43                loop.run_until_complete(loop.shutdown_asyncgens())44                loop.close()45        dispatcher_fiber = greenlet(greenlet_main)46        self._connection = self._make_connection(47            dispatcher_fiber,48            create_remote_object,49            WebSocketTransport(loop, self._ws_endpoint),50            loop)51        g_self = greenlet.getcurrent()52        def callback_wrapper(playwright_impl: Playwright) -> None:53            self._playwright = SyncPlaywright(playwright_impl)54            g_self.switch()...

_context_manager.py

Source: _context_manager.py

...36            raise Error(37                """It looks like you are using Playwright Sync API inside the asyncio loop.38Please use the Async API instead."""39            )40        def greenlet_main() -> None:41            loop.run_until_complete(self._connection.run_as_sync())42            if own_loop:43                loop.run_until_complete(loop.shutdown_asyncgens())44                loop.close()45        dispatcher_fiber = greenlet(greenlet_main)46        self._connection = Connection(47            dispatcher_fiber,48            create_remote_object,49            PipeTransport(loop, compute_driver_executable()),50            loop,51        )52        g_self = greenlet.getcurrent()53        def callback_wrapper(playwright_impl: Playwright) -> None:54            self._playwright = SyncPlaywright(playwright_impl)...

StackOverFlow community discussions

Questions

Discussion

Download files with goto in playwright-python

How to get attribute value of an element in Playwright Python

Playwright azure function doesn't install chromium Python based

How to test a single GET request in parallel for specified count?

How can I fetch the html elements within a bounding box using playwright?

What's the best way to setup playwright in Apache Airflow in Docker?

Install playwright from a local directory

How to quickly find out if an element exists in a page or not using playwright

bytesio type abnormal Two pictures saved in the same way are of different types ： <class '_io.BytesIO'> and <class 'bytes'>

How to check for element existence without getting an error in Playwright

The only way I found is wrap the goto inside a try-except block

Content of main.py

from playwright.sync_api import Playwright, sync_playwright, expect

with sync_playwright() as p:
    #We define the browser, the context and the page
    browser = p.chromium.launch(headless=False)
    context = browser.new_context()
    page = browser.new_page()
    with page.expect_download() as download_info:
        #If we navigate without try, it will throw an exception and it will stop our script, so, we wrap it inside a try except block
        try:
            page.goto("https://manueltgomes.com/wp-content/uploads/2021/09/ParseHTMLLInks_1_0_0_1.zip")
        except:
            pass
    download = download_info.value
    download.save_as(f"./{download.suggested_filename}")
    context.close()
    browser.close()

Then just run python3 main.py

The file will be saved in the same path of the main.py file

https://stackoverflow.com/questions/73652378/download-files-with-goto-in-playwright-python

You can access the href in an almost similar way to that of selenium.

element_handle = page.locator("//a")
link = element_handle.get_attribute('href')

https://stackoverflow.com/questions/70716831/how-to-get-attribute-value-of-an-element-in-playwright-python

PLAYWRITH_BROWSERS_PATH=0

Please make sure your above configuration was correct. There are some spelling mistakes in the settings. Its like PLAYWRIGHT_BROWSERS_PATH = 0

In your local.settings.json it should be

{

"IsEncrypted": false,

    "Values": {
    
        "AzureWebJobsStorage": "",
        
        "FUNCTIONS_WORKER_RUNTIME": "python",
        
        "PLAYWRIGHT_BROWSERS_PATH": "0"
    
    }

}

And In your requirement.txt file it should be

azure-functions
playwright==1.18.0

here we can see the playwright running in local as well as azure after deployment Local: enter image description here

Azure:

enter image description here

https://stackoverflow.com/questions/70778405/playwright-azure-function-doesnt-install-chromium-python-based

import requests
import threading

totalRequests = 0
numberOfThreads = 10
threads = [0] * numberOfThreads


def worker(thread):
    r = requests.get("url")
    threads[thread] = 0  # free thread


while totalRequests < 100:
    for thread in range(numberOfThreads):
        if threads[thread] == 0:
            threads[thread] = 1  # occupy thread
            t = threading.Thread(target=worker, args=(thread,))
            t.start()
            totalRequests += 1

https://stackoverflow.com/questions/74631728/how-to-test-a-single-get-request-in-parallel-for-specified-count

You can use one of those options :

const element = await page.$$("text='element'");
if (element) {
    // ...
}

const element = await page.$$("text='element'");
if (element.length) {
    // ...
}

await expect(page.locator(".MyClass")).toHaveCount(0)

https://stackoverflow.com/questions/70770526/how-to-quickly-find-out-if-an-element-exists-in-a-page-or-not-using-playwright

You could use something called element_handle.is_visible() from here.

your code should look something like below.

href_element = page.query_selector("a")
href_element.is_visible()

https://stackoverflow.com/questions/73181978/how-to-check-for-element-existence-without-getting-an-error-in-playwright

Blogs

Check out the latest blogs from LambdaTest on this topic:

Webinar: Test Orchestration using HyperExecute

The speed at which tests are executed and the “dearth of smartness” in testing are the two major problems developers and testers encounter.

Selenium Tutorial: Basics and Getting Started

Selenium is still the most influential and well-developed framework for web automation testing. Being one of the best automation frameworks with constantly evolving features, it is poised to lead the industry in all aspects as compared to other trending frameworks like Cypress, Puppeteer, PlayWright, etc. Furthermore, using Selenium gives you the flexibility to use different programming languages like C#, Ruby, Perl, Java, Python, etc., and also accommodate different operating systems and web browsers for Selenium automation testing.

Playwright End To End Testing Tutorial: A Complete Guide

It is essential for a team, when speaking about test automation, to take the time needed to think, analyze and try what will be the best tool, framework, and language that suits your team’s needs.

30 Top Automation Testing Tools In 2022

The sky’s the limit (and even beyond that) when you want to run test automation. Technology has developed so much that you can reduce time and stay more productive than you used to 10 years ago. You needn’t put up with the limitations brought to you by Selenium if that’s your go-to automation testing tool. Instead, you can pick from various test automation frameworks and tools to write effective test cases and run them successfully.

Website Testing: A Detailed Guide

Websites and web apps are growing in number day by day, and so are the expectations of people for a pleasant web experience. Even though the World Wide Web (WWW) was invented only in 1989 (32 years back), this technology has revolutionized the world we know back then. The best part is that it has made life easier for us. You no longer have to stand in long queues to pay your bills. You can get that done within a few minutes by visiting their website, web app, or mobile app.

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.