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Adds docs for python_modules_excludes. #25725

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Oct 21, 2025
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Adds docs for python_modules_excludes. #25725

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24 changes: 23 additions & 1 deletion src/content/docs/workers/wrangler/configuration.mdx
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Expand Up @@ -992,7 +992,7 @@ The following options are available:
- To specify a custom instance type, see [here](#custom-instance-types).

- `max_instances` <Type text="string" /> <MetaInfo text="optional" />
- The maximum number of concurrent container instances you want to run at any given moment. Stopped containers do not count towards this - you may have more container instances than this number overall, but only this many actively running containers at once. If a request to start a container will exceed this limit, that request will error.
- The maximum number of concurrent container instances you want to run at any given moment. Stopped containers do not count towards this - you may have more container instances than this number overall, but only this many actively running containers at once. If a request to start a container will exceed this limit, that request will error.

- Defaults to 20.

Expand Down Expand Up @@ -1128,6 +1128,28 @@ Any files that match `rules` will also be included as unbundled, external module

See https://developers.cloudflare.com/workers/wrangler/bundling/ for more details and examples.

### Python Workers

By default, Python Workers bundle the files and folders in `python_modules` at the root of your Worker (alongside your wrangler config file).
The files in this directory represent your vendored packages and is where the pywrangler tool copies packages into. In some cases, you
may find that the files in this folder are too large and if your worker doesn't require them then they just grow your bundle size for
no reason.

To fix this, you can exclude certain files from being included. To do this use the `python_modules.excludes` option, for example:

<WranglerConfig>

```toml title="wrangler.toml"
[python_modules]
excludes = ["**/*.pyc", "**/__pycache__"]
```

</WranglerConfig>

This will exclude any .pyc files and `__pycache__` directories inside any subdirectory in `python_modules`.

By default, `python_modules.excludes` is set to `["**/*.pyc"]`, so be sure to include this when setting it to a different value.

## Local development settings

:::note
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