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 6.5.7

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 6.5.7
File	Size	Uploaded
tornado-6.5.7.tar.gz	519.3 kB	Jun 8, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for tornado 6.5.7
File	Interpreter	ABI	Platform	Reset
tornado-6.5.7-cp39-abi3-win_arm64.whl 450.5 kB Jun 8, 2026	CPython 3.9	abi3	Windows ARM64	Details
tornado-6.5.7-cp39-abi3-win_amd64.whl 451.5 kB Jun 8, 2026	CPython 3.9	abi3	Windows x86-64	Details
tornado-6.5.7-cp39-abi3-win32.whl 451.0 kB Jun 8, 2026	CPython 3.9	abi3	Windows x86-32	Details
tornado-6.5.7-cp39-abi3-musllinux_1_2_x86_64.whl 450.0 kB Jun 8, 2026	CPython 3.9	abi3	Linux musl 1.2+ x86-64	Details
tornado-6.5.7-cp39-abi3-musllinux_1_2_aarch64.whl 450.6 kB Jun 8, 2026	CPython 3.9	abi3	Linux musl 1.2+ ARM64	Details
tornado-6.5.7-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl 450.7 kB Jun 8, 2026	CPython 3.9	abi3	Linux glibc 2.17+ ARM64, Linux glibc 2.28+ ARM64	Details
tornado-6.5.7-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl 449.8 kB Jun 8, 2026	CPython 3.9	abi3	Linux glibc 2.5+ x86-64, Linux glibc 2.28+ x86-64	Details
tornado-6.5.7-cp39-abi3-macosx_10_9_x86_64.whl 446.7 kB Jun 8, 2026	CPython 3.9	abi3	macOS 10.9+ x86-64	Details
tornado-6.5.7-cp39-abi3-macosx_10_9_universal2.whl 448.5 kB Jun 8, 2026	CPython 3.9	abi3	macOS 10.9+ universal2 (ARM64, x86-64)	Details

Total release size: 4.6 MB

Release files / tornado-6.5.7.tar.gz

Download URL	tornado-6.5.7.tar.gz
Size	519.3 kB
Tags	Source
SHA-256 checksum How to use checksums	`66c513a76cda70d53907bc27cf1447557699c2e95aa48ba27a442ff61c3ddfc2`
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7.tar.gz
SHA-256 checksum: 66c513a76cda70d53907bc27cf1447557699c2e95aa48ba27a442ff61c3ddfc2 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-win_arm64.whl

Download URL	tornado-6.5.7-cp39-abi3-win_arm64.whl
Size	450.5 kB
Tags	CPython 3.9 Windows ARM64 abi3
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-win_arm64.whl
SHA-256 checksum: ff934fce95643af5f11efdae618eaa73d469dc588641e5c8d19295a0c65c4796 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-win_amd64.whl

Download URL	tornado-6.5.7-cp39-abi3-win_amd64.whl
Size	451.5 kB
Tags	CPython 3.9 Windows x86-64 abi3
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-win_amd64.whl
SHA-256 checksum: de942f843533a039ef9fa3d9c88c7cd8a7c94553fb5ad0154270989b3d99a2c4 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-win32.whl

Download URL	tornado-6.5.7-cp39-abi3-win32.whl
Size	451.0 kB
Tags	CPython 3.9 Windows x86-32 abi3
SHA-256 checksum How to use checksums	`f8de3bf12d3efdd0cbe7c8887868198f8a91415e3f29fcf258d9b8eb7b1d9ae4`
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-win32.whl
SHA-256 checksum: f8de3bf12d3efdd0cbe7c8887868198f8a91415e3f29fcf258d9b8eb7b1d9ae4 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-musllinux_1_2_x86_64.whl

Download URL	tornado-6.5.7-cp39-abi3-musllinux_1_2_x86_64.whl
Size	450.0 kB
Tags	CPython 3.9 Linux musl 1.2+ x86-64 abi3
SHA-256 checksum How to use checksums	`e726f0c75da7726eec023aa62751ff8878bd2737e34fbdd33b1ae5897d2200f5`
BLAKE2b-256 checksum How to use checksums	`0230a7444fb23aa76860a14198fab96ac79f1866b0a6e19e26c4381b0938e50f`
Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-musllinux_1_2_x86_64.whl
SHA-256 checksum: e726f0c75da7726eec023aa62751ff8878bd2737e34fbdd33b1ae5897d2200f5 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-musllinux_1_2_aarch64.whl

Download URL	tornado-6.5.7-cp39-abi3-musllinux_1_2_aarch64.whl
Size	450.6 kB
Tags	CPython 3.9 Linux musl 1.2+ ARM64 abi3
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-musllinux_1_2_aarch64.whl
SHA-256 checksum: 7778b30bef919231265e91c69963ce0f49a1e9c07ac900bbe75b19ce2575ba92 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl

Download URL	tornado-6.5.7-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl
Size	450.7 kB
Tags	CPython 3.9 Linux glibc 2.17+ ARM64 Linux glibc 2.28+ ARM64 abi3
SHA-256 checksum How to use checksums	`8a46347a18f23fb92b396beebe0fb78f61dda0cc302445202c16203d8a18848b`
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl
SHA-256 checksum: 8a46347a18f23fb92b396beebe0fb78f61dda0cc302445202c16203d8a18848b Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl

Download URL	tornado-6.5.7-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl
Size	449.8 kB
Tags	CPython 3.9 Linux glibc 2.28+ x86-64 Linux glibc 2.5+ x86-64 abi3
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl
SHA-256 checksum: 8d759e71906ee783f8867b93bf26a265743da4c1e2f4a018464c1ba019862972 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-macosx_10_9_x86_64.whl

Download URL	tornado-6.5.7-cp39-abi3-macosx_10_9_x86_64.whl
Size	446.7 kB
Tags	CPython 3.9 abi3 macOS 10.9+ x86-64
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BLAKE2b-256 checksum How to use checksums	`924f090b1431e5a43df696feceffc268c5383cc079ecb5f08ce58f917109aafe`
Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

Provenance

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Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-macosx_10_9_x86_64.whl
SHA-256 checksum: 9da38de27f1da3b78a966f0dae12b5a1ea9afe72ca805d84ff06508272ddf100 Verifying attestations

Release files / tornado-6.5.7-cp39-abi3-macosx_10_9_universal2.whl

Download URL	tornado-6.5.7-cp39-abi3-macosx_10_9_universal2.whl
Size	448.5 kB
Tags	CPython 3.9 abi3 macOS 10.9+ universal2 (ARM64, x86-64)
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Upload date	Jun 8, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/tornadoweb/tornado
Publishing commit: github.com/tornadoweb/tornado/tree/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4

Workflow

Publishing configuration: github.com/tornadoweb/tornado/blob/48fc2d43d1f48b8b3b0be5dcf6a7634c6f45b1c4/.github/workflows/build.yml
Publishing logs: github.com/tornadoweb/tornado/actions/runs/27154659617/attempts/1

Artifact

Subject: tornado-6.5.7-cp39-abi3-macosx_10_9_universal2.whl
SHA-256 checksum: 148b2eb15c2c765a50796172c1e499649b35f30d2e3c3d3e15913cfa56bfb163 Verifying attestations