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# Markdown Exec
[](https://github.com/pawamoy/markdown-exec/actions?query=workflow%3Aci)
[](https://pawamoy.github.io/markdown-exec/)
[](https://pypi.org/project/markdown-exec/)
[](https://app.gitter.im/#/room/#markdown-exec:gitter.im)
[](https://app.radicle.at/nodes/seed.radicle.at/rad:z77aiLJkzYXtuNpZuvizfGkDuZbQ)
Utilities to execute code blocks in Markdown files.
For example, you write a Python code block that computes some HTML,
and this HTML is injected in place of the code block.
## Installation
```bash
pip install "markdown-exec[ansi]"
```
The `ansi` extra provides the necessary bits (`pygments-ansi-color` and a CSS file)
to render ANSI colors in HTML code blocks. The CSS file is automatically added
to MkDocs' `extra_css` when Markdown Exec is activated via `plugins` (see below).
## Configuration
This extension relies on the
[SuperFences](https://facelessuser.github.io/pymdown-extensions/extensions/superfences/)
extension of
[PyMdown Extensions](https://facelessuser.github.io/pymdown-extensions/).
To allow execution of code blocks,
configure a custom fence from Python:
```python
from markdown import Markdown
from markdown_exec import formatter, validator
Markdown(
extensions=["pymdownx.superfences"],
extension_configs={
"pymdownx.superfences": {
"custom_fences": [
{
"name": "python",
"class": "python",
"validator": validator,
"format": formatter,
}
# ...one fence for each language we support:
# bash, console, md, markdown, py, python, pycon, pyodide, sh, tree, etc.
]
}
}
)
```
...or in MkDocs configuration file, as a Markdown extension:
```yaml
# mkdocs.yml
markdown_extensions:
- pymdownx.superfences:
custom_fences:
- name: python
class: python
validator: !!python/name:markdown_exec.validator
format: !!python/name:markdown_exec.formatter
# ...one fence for each language we support:
# bash, console, md, markdown, py, python, pycon, sh, tree
```
...or in MkDocs configuration file, as a plugin:
```yaml
# mkdocs.yml
plugins:
- search
- markdown-exec
# SuperFences must still be enabled!
markdown_extensions:
- pymdownx.superfences
```
TIP: We recommend enabling Markdown Exec with the MkDocs plugin
if you are using MkDocs: it will take care of adding relevant
assets (CSS/JS) to the final site when needed.
WARNING: **Limitation of configuration through Markdown/PyMDown.**
Configuration through `pymdownx.superfences` directly is not well supported for fences that require assets inclusion, like `pyodide`.
For these you will have to include the assets manually. In the future we will provide ways to include them automatically.
## Usage
You are now able to execute code blocks instead of displaying them:
````md
```python exec="on"
print("Hello Markdown!")
```
````
The `exec` option will be true for every possible value except `0`, `no`, `off` and `false` (case insensitive).
Below you can see an example of running a bash script that is expected to
return a non-zero exit code:
````md
```bash exec="1" source="tabbed-left" returncode="2"
grep extra_css README.md && exit 2
```
````
See [usage](https://pawamoy.github.io/markdown-exec/usage/) for more details,
and the [gallery](https://pawamoy.github.io/markdown-exec/gallery/) for more examples!
## Sponsors
<!-- sponsors-start -->
<div id="premium-sponsors" style="text-align: center;">
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