playwright/docs/src/library-python.md

---
id: library
title: "Library"
---

## Installation

### Pip

[![PyPI version](https://badge.fury.io/py/playwright.svg)](https://pypi.python.org/pypi/playwright/)

```bash
pip install --upgrade pip
pip install playwright
playwright install
```

### Conda

[![Anaconda version](https://img.shields.io/conda/v/microsoft/playwright)](https://anaconda.org/Microsoft/playwright)

```bash
conda config --add channels conda-forge
conda config --add channels microsoft
conda install playwright
playwright install
```

These commands download the Playwright package and install browser binaries for Chromium, Firefox and WebKit. To modify this behavior see [installation parameters](./browsers.md#installing-browsers).

## Usage

Once installed, you can `import` Playwright in a Python script, and launch any of the 3 browsers (`chromium`, `firefox` and `webkit`).

```py
from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    browser = p.chromium.launch()
    page = browser.new_page()
    page.goto("http://playwright.dev")
    print(page.title())
    browser.close()
```

Playwright supports two variations of the API: synchronous and asynchronous. If your modern project uses [asyncio](https://docs.python.org/3/library/asyncio.html), you should use async API:

```py
import asyncio
from playwright.async_api import async_playwright

async def main():
    async with async_playwright() as p:
        browser = await p.chromium.launch()
        page = await browser.new_page()
        await page.goto("http://playwright.dev")
        print(await page.title())
        await browser.close()

asyncio.run(main())
```

## First script

In our first script, we will navigate to `whatsmyuseragent.org` and take a screenshot in WebKit.

```py
from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    browser = p.webkit.launch()
    page = browser.new_page()
    page.goto("http://whatsmyuseragent.org/")
    page.screenshot(path="example.png")
    browser.close()
```

By default, Playwright runs the browsers in headless mode. To see the browser UI, pass the `headless=False` flag while launching the browser. You can also use [`option: slowMo`] to slow down execution. Learn more in the debugging tools [section](./debug.md).

```py
firefox.launch(headless=False, slow_mo=50)
```

## Interactive mode (REPL)

You can launch the interactive python REPL:

```bash
python
```

and then launch Playwright within it for quick experimentation:

```py
>>> from playwright.sync_api import sync_playwright
>>> playwright = sync_playwright().start()
# Use playwright.chromium, playwright.firefox or playwright.webkit
# Pass headless=False to launch() to see the browser UI
>>> browser = playwright.chromium.launch()
>>> page = browser.new_page()
>>> page.goto("http://whatsmyuseragent.org/")
>>> page.screenshot(path="example.png")
>>> browser.close()
>>> playwright.stop()
```

Async REPL such as `asyncio` REPL:

```bash
python -m asyncio
```

```py
>>> from playwright.async_api import async_playwright
>>> playwright = await async_playwright().start()
>>> browser = await playwright.chromium.launch()
>>> page = await browser.new_page()
>>> await page.goto("http://whatsmyuseragent.org/")
>>> await page.screenshot(path="example.png")
>>> await browser.close()
>>> await playwright.stop()
```

## Pyinstaller

You can use Playwright with [Pyinstaller](https://www.pyinstaller.org/) to create standalone executables.

```py
# main.py
from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    browser = p.chromium.launch()
    page = browser.new_page()
    page.goto("http://whatsmyuseragent.org/")
    page.screenshot(path="example.png")
    browser.close()
```

If you want to bundle browsers with the executables:

```bash tab=bash-bash
PLAYWRIGHT_BROWSERS_PATH=0 playwright install chromium
pyinstaller -F main.py
```

```batch tab=bash-batch
set PLAYWRIGHT_BROWSERS_PATH=0
playwright install chromium
pyinstaller -F main.py
```

```powershell tab=bash-powershell
$env:PLAYWRIGHT_BROWSERS_PATH="0"
playwright install chromium
pyinstaller -F main.py
```

:::note
Bundling the browsers with the executables will generate bigger binaries.
It is recommended to only bundle the browsers you use.
:::

## Known issues

### `time.sleep()` leads to outdated state

Most likely you don't need to wait manually, since Playwright has [auto-waiting](./actionability.md). If you still rely on it, you should use `page.wait_for_timeout(5000)` instead of `time.sleep(5)` and it is better to not wait for a timeout at all, but sometimes it is useful for debugging. In these cases, use our wait (`wait_for_timeout`) method instead of the `time` module. This is because we internally rely on asynchronous operations and when using `time.sleep(5)` they can't get processed correctly.


### incompatible with `SelectorEventLoop` of `asyncio` on Windows

Playwright runs the driver in a subprocess, so it requires `ProactorEventLoop` of `asyncio` on Windows because `SelectorEventLoop` does not supports async subprocesses.

On Windows Python 3.7, Playwright sets the default event loop to `ProactorEventLoop` as it is default on Python 3.8+.

### Threading

Playwright's API is not thread-safe. If you are using Playwright in a multi-threaded environment, you should create a playwright instance per thread. See [threading issue](https://github.com/microsoft/playwright-python/issues/623) for more details.


## System requirements

Playwright requires Python 3.7 or above. The browser binaries for Chromium,
Firefox and WebKit work across the 3 platforms (Windows, macOS, Linux):

### Windows

Works with Windows and Windows Subsystem for Linux (WSL).

### macOS

Requires 11 (Big Sur) or above.

### Linux

Depending on your Linux distribution, you might need to install additional
dependencies to run the browsers.

:::note
Only Ubuntu 18.04, 20.04, and 22.04 are officially supported.
:::

See also in the [Command line tools](./cli.md#install-system-dependencies)
which has a command to install all necessary dependencies automatically for Ubuntu
LTS releases.