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docs: clarify behavior of --extras and subcommands (#7563)
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evanrittenhouse authored Mar 4, 2023
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Expand Up @@ -395,6 +395,14 @@ You can install all extras with the `--all-extras` option:
poetry install --all-extras
```

{{% note %}}
Note that `install --extras` and the variations mentioned above (`--all-extras`, `--extras foo`, etc.) only work on dependencies defined in the current project. If you want to install extras defined by dependencies, you'll have to express that in the dependency itself:
```toml
[tool.poetry.group.dev.dependencies]
fastapi = {version="^0.92.0", extras=["all"]}
```
{{% /note %}}

When installing or specifying Poetry-built packages, the extras defined in this section can be activated
as described in [PEP 508](https://www.python.org/dev/peps/pep-0508/#extras).

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