Introduction

Introduction #

Poetry is a tool for dependency management and packaging in Python. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you. Poetry offers a lockfile to ensure repeatable installs, and can build your project for distribution.

System requirements #

Poetry requires Python 3.7+. It is multi-platform and the goal is to make it work equally well on Linux, macOS and Windows.

Installation #

Note

If you are viewing documentation for the development branch, you may wish to install a preview or development version of Poetry. See the advanced installation instructions to use a preview or alternate version of Poetry.

We provide a custom installer that will install Poetry in a new virtual environment to isolate it from the rest of your system. This ensures that dependencies will not be accidentally upgraded or uninstalled, and allows Poetry to manage its own environment.

Install Poetry

The installer script is available directly at install.python-poetry.org, and is developed in its own repository. The script can be executed directly (i.e. ‘curl python’) or downloaded and then executed from disk (e.g. in a CI environment).

Warning

The previous get-poetry.py and install-poetry.py installers are deprecated. Any installs performed using get-poetry.py should be uninstalled and reinstalled using install.python-poetry.org to ensure in-place upgrades are possible.

Linux, macOS, Windows (WSL)
```
curl -sSL https://install.python-poetry.org | python3 -
```
Note

Note: On some systems, python may still refer to Python 2 instead of Python 3. We always suggest the python3 binary to avoid ambiguity.

Windows (Powershell)
```
(Invoke-WebRequest -Uri https://install.python-poetry.org -UseBasicParsing).Content | py -
```
Note

If you have installed Python through the Microsoft Store, replace py with python in the command above.
Install Poetry (advanced)

By default, Poetry is installed into a platform and user-specific directory:
- ~/Library/Application Support/pypoetry on MacOS.
- ~/.local/share/pypoetry on Linux/Unix.
- %APPDATA%\pypoetry on Windows.
If you wish to change this, you may define the $POETRY_HOME environment variable:
```
curl -sSL https://install.python-poetry.org | POETRY_HOME=/etc/poetry python3 -
```
If you want to install prerelease versions, you can do so by passing --preview option to install-poetry.py or by using the $POETRY_PREVIEW environment variable:
```
curl -sSL https://install.python-poetry.org | python3 - --preview
curl -sSL https://install.python-poetry.org | POETRY_PREVIEW=1 python3 -
```
Similarly, if you want to install a specific version, you can use --version option or the $POETRY_VERSION environment variable:
```
curl -sSL https://install.python-poetry.org | python3 - --version 1.2.0
curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.2.0 python3 -
```
You can also install Poetry from a git repository by using the --git option:
```
curl -sSL https://install.python-poetry.org | python3 - --git https://github.com/python-poetry/poetry.git@master
```
Add Poetry to your PATH

The installer creates a poetry wrapper in a well-known, platform-specific directory:
- $HOME/.local/bin on Unix.
- %APPDATA%\Python\Scripts on Windows.
- $POETRY_HOME/bin if $POETRY_HOME is set.
If this directory is not present in your $PATH, you can add it in order to invoke Poetry as poetry.

Alternatively, the full path to the poetry binary can always be used:
- ~/Library/Application Support/pypoetry/venv/bin/poetry on MacOS.
- ~/.local/share/pypoetry/venv/bin/poetry on Linux/Unix.
- %APPDATA%\pypoetry\venv\Scripts\poetry on Windows.
- $POETRY_HOME/venv/bin/poetry if $POETRY_HOME is set.
Use Poetry

Once Poetry is installed and in your $PATH, you can execute the following:
```
poetry --version
```
If you see something like Poetry (version 1.2.0), your install is ready to use!
Update Poetry

Poetry is able to update itself when installed using the official installer.
```
poetry self update
```
If you want to install pre-release versions, you can use the --preview option.
```
poetry self update --preview
```
And finally, if you want to install a specific version, you can pass it as an argument to self update.
```
poetry self update 1.2.0
```
Warning

Poetry 1.1 series releases are not able to update in-place to 1.2 or newer series releases. To migrate to newer releases, uninstall using your original install method, and then reinstall using the methods above.
Uninstall Poetry

If you decide Poetry isn’t your thing, you can completely remove it from your system by running the installer again with the --uninstall option or by setting the POETRY_UNINSTALL environment variable before executing the installer.
```
curl -sSL https://install.python-poetry.org | python3 - --uninstall
curl -sSL https://install.python-poetry.org | POETRY_UNINSTALL=1 python3 -
```
Warning
If you installed using the deprecated get-poetry.py script, you should use it to uninstall instead:
```
curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python3 - --uninstall
```

Using pipx to install Poetry is also possible and fully supported.

pipx is used to install Python CLI applications globally while still isolating them in virtual environments. pipx will manage upgrades and uninstalls when used to install Poetry.

Install Poetry
```
pipx install poetry
```
Install Poetry (advanced)

pipx can be install different versions of Poetry, using the same syntax as pip:
```
pipx install poetry==1.2.0
```
pipx can also install versions of Poetry in parallel, which allows for easy testing of alternate or prerelease versions. Each version is given a unique, user-specified suffix, which will be used to create a unique binary name:
```
pipx install --suffix=@1.2.0 poetry==1.2.0
poetry@1.2.0 --version
```
```
pipx install --suffix=@preview --pip-args=--pre poetry
poetry@preview --version
```
Finally, pipx can install any valid pip requirement spec, which allows for installations of the development version from git, or even for local testing of pull requests:
```
pipx install --suffix @master git+https://github.com/python-poetry/poetry.git@master
pipx install --suffix @pr1234 git+https://github.com/python-poetry/poetry.git@refs/pull/1234/head
```
Update Poetry
```
pipx upgrade poetry
```
Uninstall Poetry
```
pipx uninstall poetry
```

Poetry can be installed manually using pip and the venv module. By doing so you will essentially perform the steps carried out by the official installer. As this is an advanced installation method, these instructions are Unix-only and omit specific examples such as installing from git.

The variable $VENV_PATH will be used to indicate the path at which the virtual environment was created.

python3 -m venv $VENV_PATH
$VENV_PATH/bin/pip install -U pip setuptools
$VENV_PATH/bin/pip install poetry

Poetry will be available at $VENV_PATH/bin/poetry and can be invoked directly or symlinked elsewhere.

To uninstall Poetry, simply delete the entire $VENV_PATH directory.

Unlike development environments, where making use of the latest tools is desirable, in a CI environment reproducibility should be made the priority. Here are some suggestions for installing Poetry in such an environment.

Installation method

The official installer script (install.python-poetry.org) offers a streamlined and simplified installation of Poetry, sufficient for developer use or for simple pipelines. However, in a CI environment the other two supported installation methods (pipx and manual) should be seriously considered.

Using install.python-poetry.org

Downloading a copy of the installer script to a place accessible by your CI pipelines (or maintaining a copy of the repository) is strongly suggested, to ensure your pipeline’s stability and to maintain control over what code is executed.

By default the installer will install to a user-specific directory. In more complex pipelines that may make accessing Poetry difficult (especially in cases like multi-stage container builds). It is highly suggested to make use of $POETRY_HOME when using the official installer in CI, as that way the exact paths can be controlled.

export POETRY_HOME=/opt/poetry
python3 install-poetry.py --version 1.2.0
$POETRY_HOME/bin/poetry --version

Using pipx

Just as pipx is a powerful tool for development use, it is equally useful in a CI environment. It takes the same steps the installer does to safely install Poetry isolated from the rest of your system, but is generic and able to do this for any Python package, with a syntax/usage that is similar to pip. pipx should be considered equally supported in comparison to the official installer, and should be one of your top choices for use of Poetry in CI.

pipx install poetry==1.2.0

Using pip (aka manually)

For maximum control in your CI environment, installation with pip is fully supported and something you should consider. While this requires more explicit commands and knowledge of Python packaging from you, it in return offers the best debugging experience, and leaves you subject to the fewest external tools.

export POETRY_HOME=/opt/poetry
python3 -m venv $POETRY_HOME
$POETRY_HOME/bin/pip install poetry==1.2.0
$POETRY_HOME/bin/poetry --version

Note

If you install Poetry via pip, ensure you have Poetry installed into an isolated environment that is not the same as the target environment managed by Poetry. If Poetry and your project are installed into the same environment, Poetry is likely to upgrade or uninstall its own dependencies (causing hard-to-debug and understand errors).

Version pinning

Whatever method you use, it is highly recommended to explicitly control the version of Poetry used, so that you are able to upgrade after performing your own validation. Each install method has a different syntax for setting the version – the following are some simple examples:

curl -sSL https://install.python-poetry.org | python3 - --version 1.2.0
# or
curl -sSL https://install.python-poetry.org | POETRY_VERSION=1.2.0 python3 -

pipx install poetry==1.2.0

/path/to/venv/bin/pip install poetry==1.2.0

Enable tab completion for Bash, Fish, or Zsh #

poetry supports generating completion scripts for Bash, Fish, and Zsh. See poetry help completions for full details, but the gist is as simple as using one of the following:

Bash #

Auto-loaded (recommended) #

poetry completions bash >> ~/.bash_completion

Lazy-loaded #

poetry completions bash > ${XDG_DATA_HOME:-~/.local/share}/bash-completion/completions/poetry

Fish #

poetry completions fish > ~/.config/fish/completions/poetry.fish

Zsh #

poetry completions zsh > ~/.zfunc/_poetry

You must then add the following lines in your ~/.zshrc, if they do not already exist:

fpath+=~/.zfunc
autoload -Uz compinit && compinit

Oh My Zsh #

mkdir $ZSH_CUSTOM/plugins/poetry
poetry completions zsh > $ZSH_CUSTOM/plugins/poetry/_poetry

You must then add poetry to your plugins array in ~/.zshrc:

plugins(
	poetry
	...
	)

prezto #

poetry completions zsh > ~/.zprezto/modules/completion/external/src/_poetry

Note

You may need to restart your shell in order for these changes to take effect.