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Use page.expect_download() around the action that starts the download, obtain the resulting Download object, and call download.save_as() with a path inside a Python temporary directory. This gives your program an explicit, predictable destination while keeping cleanup under your control.
The reliable download workflow
Playwright downloads are event-driven. Enter the download-waiting context before clicking the link or button that triggers the attachment. Then save the completed (or still-transferring) download to a path you choose.
- Create a temporary directory with Python’s
TemporaryDirectory. - Launch Playwright and create a browser context and page.
- Navigate to the page containing the download control.
- Wrap the triggering action in
page.expect_download(). - Read the resulting
Downloadobject. - Call
download.save_as()with a path in the temporary directory. - Consume the file before the temporary-directory context exits, or move it elsewhere if it must survive.
Microsoft’s Downloads | Playwright Python documentation says attachments are downloaded into a temporary folder and that files belonging to a browser context are deleted when that context closes. An explicit copy made with save_as() has the lifetime of the destination you select.
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Synchronous Python example
This complete script uses a deterministic filename. Replace the URL and locator with the page and control in your application.
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from pathlib import Path
from tempfile import TemporaryDirectory
from playwright.sync_api import sync_playwright
with TemporaryDirectory() as temp_dir:
destination = Path(temp_dir) / "report.csv"
with sync_playwright() as p:
browser = p.chromium.launch()
context = browser.new_context()
page = context.new_page()
page.goto("https://example.com")
with page.expect_download() as download_info:
page.get_by_text("Download file").click()
download = download_info.value
download.save_as(destination)
# Process the file while TemporaryDirectory is still active.
print(destination, destination.stat().st_size)
context.close()
browser.close()
# destination is removed when the TemporaryDirectory block ends.The download event must be registered before the click. If the listener is installed afterward, a fast download can already have fired and your code can time out.
Asynchronous Python version
Use the async API consistently: async_playwright, async with, and await. Do not mix synchronous objects with async ones.
import asyncio
from pathlib import Path
from tempfile import TemporaryDirectory
from playwright.async_api import async_playwright
async def main():
with TemporaryDirectory() as temp_dir:
destination = Path(temp_dir) / "report.csv"
async with async_playwright() as p:
browser = await p.chromium.launch()
context = await browser.new_context()
page = await context.new_page()
await page.goto("https://example.com")
async with page.expect_download() as download_info:
await page.get_by_text("Download file").click()
download = await download_info.value
await download.save_as(destination)
print(destination, destination.stat().st_size)
await context.close()
await browser.close()
asyncio.run(main())The temporary directory remains available for the entire with TemporaryDirectory() block. Read, parse, upload, or copy the file during that block. To retain it after cleanup, move it to a permanent directory before leaving the block.
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Choosing a filename safely
Supply your own name
A fixed name such as report.csv is safest for automation. It avoids collisions caused by server-provided names and prevents page-controlled text from becoming an unsafe path. Add an identifier or create a unique temporary directory when several downloads run concurrently.
Use the suggested filename when appropriate
download.suggested_filename is generally derived from the response’s Content-Disposition header or the link’s download attribute. Browsers can compute this differently. If you use it, treat it as untrusted input: strip directory components, reject unexpected characters, and resolve it beneath your temporary directory rather than concatenating arbitrary path text.
from pathlib import Path
name = Path(download.suggested_filename).name
safe_destination = Path(temp_dir) / name
download.save_as(safe_destination)For the API details and filename behavior, see the Download | Playwright Python reference.
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Temporary-directory lifetime and cleanup
TemporaryDirectory removes its directory when its context manager exits, including normal completion. That is useful for sensitive or intermediate artifacts, but it means this will fail after the block:
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path = Path(temp_dir) / "data.bin"
download.save_as(path)
# The directory and path no longer exist here.If another component needs the file later, copy it before cleanup:
import shutil
from pathlib import Path
from tempfile import TemporaryDirectory
permanent = Path("./processed")
permanent.mkdir(exist_ok=True)
with TemporaryDirectory() as temp_dir:
temporary_path = Path(temp_dir) / "data.bin"
download.save_as(temporary_path)
shutil.copy2(temporary_path, permanent / "data.bin")Playwright’s own managed download is removed when the producing browser context closes, even when you configure a launch directory. An explicit save_as() copy is therefore the appropriate boundary when your application needs a known destination.
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save_as(), path(), and downloads_path
| Approach | What it controls | Important limitation | Best use |
|---|---|---|---|
download.save_as(path) |
Copies one download to your chosen path | The destination still follows your directory’s cleanup rules | An application-managed temporary file, deterministic name, or handoff to another process |
download.path() |
Returns Playwright’s managed file path after a successful transfer | Throws when connected remotely; the filename is a random GUID and context cleanup still applies | Short-lived local processing when you do not need to choose the name |
browser_type.launch(downloads_path=...) |
Selects the browser launch’s accepted-download directory | Does not override deletion when the producing context closes | Global storage configuration for a launch, not durable retention |
save_as() may be called while the transfer is in progress; it waits as necessary. path() waits for completion and returns only after a successful download. See the BrowserType reference for launch configuration.
Waiting, timeouts, and failed downloads
Default timeout
page.expect_download() has a 30,000 millisecond default timeout. Set a larger value for a legitimately slow transfer, preferably for the specific wait:
with page.expect_download(timeout=120_000) as download_info:
page.get_by_role("button", name="Export").click()You can also configure a context default timeout, but a local timeout documents which operation is expected to take longer. The Page API reference describes the event and timeout behavior.
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Check the failure property
After receiving the object, inspect download.failure() (or await download.failure() asynchronously) when you need an explicit diagnostic. A failed transfer cannot be saved successfully; fix authentication, navigation, network, or server errors before processing the file.
When a click does not start a download
- Confirm that the control really returns an attachment rather than opening a new tab, rendering a PDF, or navigating to an error page.
- Register
expect_download()immediately before the exact action, including any required preceding click that opens a menu. - Wait for authentication or application state before clicking; an expired session often produces HTML instead of the expected file.
- Use a locator that targets the intended control, not a similarly named hidden element.
Common errors and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| “Timeout 30000ms exceeded” while waiting | The action did not emit a download, or the transfer exceeded 30 seconds | Verify the UI behavior and locator; then increase the expectation timeout for known slow files. |
save_as reports a missing parent |
The destination directory was never created or the temporary scope already ended | Create the directory first and save inside the active TemporaryDirectory block. |
| File disappears after the script | It was Playwright-managed or inside a temporary directory that has been cleaned up | Call save_as(), then copy or move the result to a persistent location before closing the context or temporary-directory block. |
| Unexpected filename or path traversal risk | Using a server- or page-supplied suggested name directly | Prefer a fixed name; otherwise reduce it to a basename and validate the extension and characters. |
| Async type errors | Synchronous and asynchronous APIs were mixed | Use one style throughout and await the async event result, actions, and save operation. |
path() fails in a remote connection |
The API does not expose the managed path remotely | Use save_as() to copy the file to a path accessible to the process that needs it. |
Performance, concurrency, and reliability
- Keep the browser alive for related downloads. Closing the context invalidates its managed files.
- Use one temporary directory per job. This prevents concurrent workers from overwriting a common filename and makes cleanup atomic at the job boundary.
- Do not poll the filesystem. The download event and
save_as()provide synchronization and wait for transfer completion. - Limit retention deliberately. Temporary files can contain personal or confidential data; clean them promptly and set restrictive permissions when your operating system or deployment requires it.
- Choose timeouts from observed transfer characteristics. A longer timeout handles slow servers; it does not repair a locator that never initiates a download.
- Validate the result. Check that the destination exists and has the expected size or format before handing it to downstream code.
Install and use the Playwright Python library according to the Getting started - Library documentation, including the browser installation step required by your environment.
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FAQ
Does save_as() rename the original browser download?
No. It copies the download to the destination path; the browser-managed file remains subject to context cleanup.
Can I save before the download finishes?
Yes. save_as() waits for the transfer to finish when necessary.
Is downloads_path a permanent archive?
No. It selects launch storage, but context-owned downloads are still deleted when that context closes.
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