tornado

Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.

Hello, world

Here is a simple “Hello, world” example web app for Tornado:

import asyncio
import tornado

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),
    ])

async def main():
    app = make_app()
    app.listen(8888)
    await asyncio.Event().wait()

if __name__ == "__main__":
    asyncio.run(main())

This example does not use any of Tornado’s asynchronous features; for that see this simple chat room.

Documentation

Documentation and links to additional resources are available at https://www.tornadoweb.org

Metadata

Release files for tornado 6.5.8

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for tornado 6.5.8
File	Size	Uploaded
tornado-6.5.8.tar.gz	520.5 kB	Aug 7, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for tornado 6.5.8
File	Interpreter	ABI	Platform	Reset
tornado-6.5.8-cp39-abi3-win_arm64.whl 451.4 kB Aug 7, 2026	CPython 3.9	abi3	Windows ARM64	Details
tornado-6.5.8-cp39-abi3-win_amd64.whl 452.4 kB Aug 7, 2026	CPython 3.9	abi3	Windows x86-64	Details
tornado-6.5.8-cp39-abi3-win32.whl 452.0 kB Aug 7, 2026	CPython 3.9	abi3	Windows x86-32	Details
tornado-6.5.8-cp39-abi3-musllinux_1_2_x86_64.whl 450.9 kB Aug 7, 2026	CPython 3.9	abi3	Linux musl 1.2+ x86-64	Details
tornado-6.5.8-cp39-abi3-musllinux_1_2_aarch64.whl 451.5 kB Aug 7, 2026	CPython 3.9	abi3	Linux musl 1.2+ ARM64	Details
tornado-6.5.8-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 451.7 kB Aug 7, 2026	CPython 3.9	abi3	Linux glibc 2.17+ ARM64, Linux glibc 2.28+ ARM64	Details
tornado-6.5.8-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl 450.7 kB Aug 7, 2026	CPython 3.9	abi3	Linux glibc 2.5+ x86-64, Linux glibc 2.28+ x86-64	Details
tornado-6.5.8-cp39-abi3-macosx_10_9_x86_64.whl 447.6 kB Aug 7, 2026	CPython 3.9	abi3	macOS 10.9+ x86-64	Details
tornado-6.5.8-cp39-abi3-macosx_10_9_universal2.whl 449.5 kB Aug 7, 2026	CPython 3.9	abi3	macOS 10.9+ universal2 (ARM64, x86-64)	Details

Total release size: 4.6 MB

Release files / tornado-6.5.8.tar.gz

Download URL	tornado-6.5.8.tar.gz
Size	520.5 kB
Tags	Source
SHA-256 checksum How to use checksums	`9452e1b208a8bd771e2cb1f2ff564985b9b214bdebbe622793e1799e0a6bd23f`
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8.tar.gz
SHA-256 checksum: 9452e1b208a8bd771e2cb1f2ff564985b9b214bdebbe622793e1799e0a6bd23f Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-win_arm64.whl

Download URL	tornado-6.5.8-cp39-abi3-win_arm64.whl
Size	451.4 kB
Tags	CPython 3.9 Windows ARM64 abi3
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-win_arm64.whl
SHA-256 checksum: 68a7468c7e289f8514d7d664101753903217eff1bb6822c6b5994a0b5f5bcb26 Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-win_amd64.whl

Download URL	tornado-6.5.8-cp39-abi3-win_amd64.whl
Size	452.4 kB
Tags	CPython 3.9 Windows x86-64 abi3
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-win_amd64.whl
SHA-256 checksum: 11881db6b7c168494be2c2d12e65931451bdf7ee718535418ae1d8855dd5a0ee Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-win32.whl

Download URL	tornado-6.5.8-cp39-abi3-win32.whl
Size	452.0 kB
Tags	CPython 3.9 Windows x86-32 abi3
SHA-256 checksum How to use checksums	`67832909c4779c64942380cb5f044a5c6163d00831472d80e25e115de9917836`
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-win32.whl
SHA-256 checksum: 67832909c4779c64942380cb5f044a5c6163d00831472d80e25e115de9917836 Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-musllinux_1_2_x86_64.whl

Download URL	tornado-6.5.8-cp39-abi3-musllinux_1_2_x86_64.whl
Size	450.9 kB
Tags	CPython 3.9 Linux musl 1.2+ x86-64 abi3
SHA-256 checksum How to use checksums	`7b94ff0e128fe0542f3bd331fb44d06260fc4ac16881545159f34ef08aad4195`
BLAKE2b-256 checksum How to use checksums	`29b593185859245ad3f00e62175f29607346788b696369347f0146e0421286bb`
Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-musllinux_1_2_x86_64.whl
SHA-256 checksum: 7b94ff0e128fe0542f3bd331fb44d06260fc4ac16881545159f34ef08aad4195 Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-musllinux_1_2_aarch64.whl

Download URL	tornado-6.5.8-cp39-abi3-musllinux_1_2_aarch64.whl
Size	451.5 kB
Tags	CPython 3.9 Linux musl 1.2+ ARM64 abi3
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-musllinux_1_2_aarch64.whl
SHA-256 checksum: 5d242290bdf7ab3151bc1065fdd75c0dcc21cbc7b49f22a4c56329c2d6566d22 Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl

Download URL	tornado-6.5.8-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl
Size	451.7 kB
Tags	CPython 3.9 Linux glibc 2.17+ ARM64 Linux glibc 2.28+ ARM64 abi3
SHA-256 checksum How to use checksums	`7e2360a0ffbe145eca8af0b19cb7203d79b1a98dd4cccdd6b368f6f49c2e3808`
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl
SHA-256 checksum: 7e2360a0ffbe145eca8af0b19cb7203d79b1a98dd4cccdd6b368f6f49c2e3808 Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl

Download URL	tornado-6.5.8-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl
Size	450.7 kB
Tags	CPython 3.9 Linux glibc 2.28+ x86-64 Linux glibc 2.5+ x86-64 abi3
SHA-256 checksum How to use checksums	`547d63f450d570c14fe0e8db2cfb14c9bbd1c2503b4a6612586267955aa47b58`
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

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Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl
SHA-256 checksum: 547d63f450d570c14fe0e8db2cfb14c9bbd1c2503b4a6612586267955aa47b58 Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-macosx_10_9_x86_64.whl

Download URL	tornado-6.5.8-cp39-abi3-macosx_10_9_x86_64.whl
Size	447.6 kB
Tags	CPython 3.9 abi3 macOS 10.9+ x86-64
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-macosx_10_9_x86_64.whl
SHA-256 checksum: 9715b5eb79735b2bcd454ce216a9275b7c0470e64ea1bf5742f78b2f72b26eeb Verifying attestations

Release files / tornado-6.5.8-cp39-abi3-macosx_10_9_universal2.whl

Download URL	tornado-6.5.8-cp39-abi3-macosx_10_9_universal2.whl
Size	449.5 kB
Tags	CPython 3.9 abi3 macOS 10.9+ universal2 (ARM64, x86-64)
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Upload date	Aug 7, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

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Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/a55abe3e3bf59994f29b2f7084c46341f0d4f6a7/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/31139652306/attempts/1

Artifact

Subject: tornado-6.5.8-cp39-abi3-macosx_10_9_universal2.whl
SHA-256 checksum: cc6aa787d7cfab7c3d35189dc7a56fbd2399a569624c730c6b55b3d6531d0403 Verifying attestations