slackblocks

library2.0.0pypypi✓ verified 85d ago

Python wrapper for the Slack Blocks API, providing a fluent interface for constructing Block Kit messages. Current version 1.2.3 works with Python >= 3.8.1, released occasionally with minor updates. It aims to simplify building complex Slack message layouts.

communication serialization

pip install slackblocks

package ↗

INSTALL

IMPORT

SIG · SLACKBLOCKS

slackblocks

communicationpythonv2.0.0

Install

1.7s avg

Import

54ms

Disk

16MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v2.0.0 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.058s · 18.2MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 1.7s · import 0.050s · 19MB

16MB installed

● package 16MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Message

✓ from slackblocks import Message

Main entry point for creating Slack messages.

SectionBlock

✓ from slackblocks import SectionBlock

Used to add section blocks to messages.

ImageBlock

✓ from slackblocks import ImageBlock

Used to add image blocks.

DividerBlock

✓ from slackblocks import DividerBlock

Used to add a divider line.

ContextBlock

✓ from slackblocks import ContextBlock

Used to add context elements.

Construct a basic Slack message with a section and an image block, then send using slack_sdk.

import os from slackblocks import Message, SectionBlock, ImageBlock message = Message( channel="#general", text="Hello, world!", blocks=[ SectionBlock(text="This is a section block"), ImageBlock(image_url="https://example.com/image.png", alt_text="Example Image") ] ) # Send via slack_sdk or similar from slack_sdk import WebClient client = WebClient(token=os.environ.get("SLACK_TOKEN", "")) response = client.chat_postMessage(**message) print(response)

Debug

Known issues

gotcha`Message` does not directly send requests; it only builds the payload. You must use an HTTP client (e.g., slack_sdk) to send.

fix

Use `client.chat_postMessage(**message)` where `message` is a SlackBlocks Message object.

affects: all

gotchaBlocks must be passed as a list to `Message`; passing a single block without list wrapping will break.

fix

Always wrap blocks: `blocks=[SectionBlock(...)]` even if one block.

affects: all

deprecatedThe `channel` parameter in `Message` may be deprecated in future versions; prefer passing channel when sending via the client.

fix

Omit channel from Message constructor and set it in the HTTP call: `client.chat_postMessage(channel="#general", **message)`.

affects: >=1.0

gotchaText in SectionBlock must be a string, not a dict; using Block Kit object syntax incorrectly may cause errors.

fix

Use plain strings: `SectionBlock(text="Hello")`. For rich text, use `mrkdwn=True` or similar parameters.

affects: all

Errors

Common errors & fixes

TypeError: Object of type SectionBlock is not JSON serializable

Trying to serialize the Message object directly without calling its `build()` or using `**message`

fix

Use `**message` when passing to slack_sdk: `client.chat_postMessage(**message)`. Or call `message.build()` to get a dict.

ModuleNotFoundError: No module named 'slackblocks'

slackblocks is not installed or installed in a different environment.

fix

Run `pip install slackblocks` in your active environment.

KeyError: 'blocks'

The Slack API requires a 'blocks' field in the payload, but Message without blocks may omit it.

fix

Always provide a `blocks` parameter when constructing Message, even if empty list: `blocks=[]`.

Upgrade

Version history

2.0.0latest on PyPI · released May 15, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

36 hits · last 30 days

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OpenAI (training)

Resources

packagehttps://pypi.org/project/slackblocks/ ↗