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Libraries

This chapter will tell you how to make your library installable through Poetry. Versioning Poetry requires PEP 440-compliant versions for all projects. While Poetry does not enforce any release convention, it used to encourage the use of semantic versioning within the scope of PEP 440 and supports version constraints that are especially suitable for semver. Note As an example, 1.0.0-hotfix.1 is not compatible with PEP 440. Repositories

Poetry supports the use of PyPI and private repositories for discovery of packages as well as for publishing your projects. By default, Poetry is configured to use the PyPI repository, for package installation and publishing. So, when you add dependencies to your project, Poetry will assume they are available on PyPI. This represents most cases and will likely be enough for most users. Private Repository Example Installing from private package sources By default, Poetry discovers and installs packages from PyPI.. Managing environments

Poetry makes project environment isolation one of its core features. What this means is that it will always work isolated from your global Python installation. Dependency specification

Dependencies for a project can be specified in various forms, which depend on the type of the dependency and on the optional constraints that might be needed for it to be installed. Version constraints Caret requirements Caret requirements allow SemVer compatible updates to a specified version. Plugins

Poetry supports using and building plugins if you wish to alter or expand Poetry’s functionality with your own. For example if your environment poses special requirements on the behaviour of Poetry which do not apply to the majority of its users or if you wish to accomplish something with Poetry in a way that is not desired by most users. In these cases you could consider creating a plugin to handle your specific logic.. The pyproject.toml file

The tool.poetry section of the pyproject.toml file is composed of multiple sections. package-mode Whether Poetry operates in package mode (default) or not. Community

Badge For any projects using Poetry, you may add its official badge somewhere prominent like the README. Markdown [![Poetry](https://img.shields.io/endpoint?url=https://python-poetry.org/badge/v0.json)](https://python-poetry.org/) reStructuredText

Why is the dependency resolution process slow? While the dependency resolver at the heart of Poetry is highly optimized and should be fast enough for most cases, with certain sets of dependencies it can take time to find a valid solution. This is due to the fact that not all libraries on PyPI have properly declared their metadata and, as such, they are not available via the PyPI JSON API..

Commands #

You’ve already learned how to use the command-line interface to do some things. This chapter documents all the available commands.

To get help from the command-line, simply call poetry to see the complete list of commands, then --help combined with any of those can give you more information.

Global options #

  • --verbose (-v|vv|vvv) : Increase the verbosity of messages: “-v” for normal output, “-vv” for more verbose output and “-vvv” for debug.
  • --help (-h) : Display help information.
  • --quiet (-q) : Do not output any message.
  • --ansi : Force ANSI output.
  • --no-ansi : Disable ANSI output.
  • --version (-V) : Display this application version.
  • --no-interaction (-n) : Do not ask any interactive question.
  • --no-plugins : Disables plugins.
  • --no-cache : Disables Poetry source caches.
  • --directory=DIRECTORY (-C) : The working directory for the Poetry command (defaults to the current working directory).
  • new #

    This command will help you kickstart your new Python project by creating a directory structure suitable for most projects.

    poetry new my-package
    

    will create a folder as follows:

    my-package
    ├── pyproject.toml
    ├── README.md
    ├── my_package
    │   └── __init__.py
    └── tests
        └── __init__.py
    

    If you want to name your project differently than the folder, you can pass the --name option:

    poetry new my-folder --name my-package
    

    If you want to use a src folder, you can use the --src option:

    poetry new --src my-package
    

    That will create a folder structure as follows:

    my-package
    ├── pyproject.toml
    ├── README.md
    ├── src
    │   └── my_package
    │       └── __init__.py
    └── tests
        └── __init__.py
    

    The --name option is smart enough to detect namespace packages and create the required structure for you.

    poetry new --src --name my.package my-package
    

    will create the following structure:

    my-package
    ├── pyproject.toml
    ├── README.md
    ├── src
    │   └── my
    │       └── package
    │           └── __init__.py
    └── tests
        └── __init__.py
    

    Options #

  • --name : Set the resulting package name.
  • --src : Use the src layout for the project.
  • --readme : Specify the readme file extension. Default is md . If you intend to publish to PyPI keep the recommendations for a PyPI-friendly README in mind.
  • init #

    This command will help you create a pyproject.toml file interactively by prompting you to provide basic information about your package.

    It will interactively ask you to fill in the fields, while using some smart defaults.

    poetry init
    

    Options #

  • --name : Name of the package.
  • --description : Description of the package.
  • --author : Author of the package.
  • --python Compatible Python versions.
  • --dependency : Package to require with a version constraint. Should be in format foo:1.0.0 .
  • --dev-dependency : Development requirements, see --dependency .
  • install #

    The install command reads the pyproject.toml file from the current project, resolves the dependencies, and installs them.

    poetry install
    

    If there is a poetry.lock file in the current directory, it will use the exact versions from there instead of resolving them. This ensures that everyone using the library will get the same versions of the dependencies.

    If there is no poetry.lock file, Poetry will create one after dependency resolution.

    If you want to exclude one or more dependency groups for the installation, you can use the --without option.

    poetry install --without test,docs
    
    The --no-dev option is now deprecated. You should use the --only main or --without dev notation instead.

    You can also select optional dependency groups with the --with option.

    poetry install --with test,docs
    

    It’s also possible to only install specific dependency groups by using the only option.

    poetry install --only test,docs
    

    To only install the project itself with no dependencies, use the --only-root flag.

    poetry install --only-root
    

    See Dependency groups for more information about dependency groups.

    If you want to synchronize your environment – and ensure it matches the lock file – use the --sync option.

    poetry install --sync
    

    The --sync can be combined with group-related options:

    poetry install --without dev --sync
    poetry install --with docs --sync
    poetry install --only dev --sync
    

    You can also specify the extras you want installed by passing the -E|--extras option (See Extras for more info). Pass --all-extras to install all defined extras for a project.

    poetry install --extras "mysql pgsql"
    poetry install -E mysql -E pgsql
    poetry install --all-extras
    

    Extras are not sensitive to --sync. Any extras not specified will always be removed.

    poetry install --extras "A B"  # C is removed
    

    By default poetry will install your project’s package every time you run install:

    $ poetry install
    Installing dependencies from lock file
    No dependencies to install or update
      - Installing <your-package-name> (x.x.x)
    

    If you want to skip this installation, use the --no-root option.

    poetry install --no-root
    

    Similar to --no-root you can use --no-directory to skip directory path dependencies:

    poetry install --no-directory
    

    This is mainly useful for caching in CI or when building Docker images. See the FAQ entry for more information on this option.

    By default poetry does not compile Python source files to bytecode during installation. This speeds up the installation process, but the first execution may take a little more time because Python then compiles source files to bytecode automatically. If you want to compile source files to bytecode during installation, you can use the --compile option:

    poetry install --compile
    
    The --compile option has no effect if installer.modern-installation is set to false because the old installer always compiles source files to bytecode.

    Options #

  • --without: The dependency groups to ignore.
  • --with: The optional dependency groups to include.
  • --only: The only dependency groups to include.
  • --only-root: Install only the root project, exclude all dependencies.
  • --sync: Synchronize the environment with the locked packages and the specified groups.
  • --no-root: Do not install the root package (your project).
  • --no-directory: Skip all directory path dependencies (including transitive ones).
  • --dry-run: Output the operations but do not execute anything (implicitly enables –verbose).
  • --extras (-E): Features to install (multiple values allowed).
  • --all-extras: Install all extra features (conflicts with –extras).
  • --compile: Compile Python source files to bytecode.
  • --no-dev: Do not install dev dependencies. (Deprecated, use --only main or --without dev instead)
  • --remove-untracked: Remove dependencies not presented in the lock file. (Deprecated, use --sync instead)
  • When --only is specified, --with and --without options are ignored.

    update #

    In order to get the latest versions of the dependencies and to update the poetry.lock file, you should use the update command.

    poetry update
    

    This will resolve all dependencies of the project and write the exact versions into poetry.lock.

    If you just want to update a few packages and not all, you can list them as such:

    poetry update requests toml
    

    Note that this will not update versions for dependencies outside their version constraints specified in the pyproject.toml file. In other terms, poetry update foo will be a no-op if the version constraint specified for foo is ~2.3 or 2.3 and 2.4 is available. In order for foo to be updated, you must update the constraint, for example ^2.3. You can do this using the add command.

    Options #

  • --without: The dependency groups to ignore.
  • --with: The optional dependency groups to include.
  • --only: The only dependency groups to include.
  • --dry-run : Outputs the operations but will not execute anything (implicitly enables –verbose).
  • --no-dev : Do not update the development dependencies. (Deprecated, use --only main or --without dev instead)
  • --lock : Do not perform install (only update the lockfile).
  • --sync: Synchronize the environment with the locked packages and the specified groups.
  • When --only is specified, --with and --without options are ignored.

    add #

    The add command adds required packages to your pyproject.toml and installs them.

    If you do not specify a version constraint, poetry will choose a suitable one based on the available package versions.

    poetry add requests pendulum
    

    A package is looked up, by default, only from the Default Package Source. You can modify the default source (PyPI); or add and use Supplemental Package Sources or Explicit Package Sources.

    For more information, refer to the Package Sources documentation.

    You can also specify a constraint when adding a package:

    # Allow >=2.0.5, <3.0.0 versions
    poetry add pendulum@^2.0.5
    # Allow >=2.0.5, <2.1.0 versions
    poetry add pendulum@~2.0.5
    # Allow >=2.0.5 versions, without upper bound
    poetry add "pendulum>=2.0.5"
    # Allow only 2.0.5 version
    poetry add pendulum==2.0.5
    
    See the Dependency specification page for more information about the @ operator.

    If you try to add a package that is already present, you will get an error. However, if you specify a constraint, like above, the dependency will be updated by using the specified constraint.

    If you want to get the latest version of an already present dependency, you can use the special latest constraint:

    poetry add pendulum@latest
    
    See the Dependency specification for more information on setting the version constraints for a package.

    You can also add git dependencies:

    poetry add git+https://github.com/sdispater/pendulum.git
    

    or use ssh instead of https:

    poetry add git+ssh://git@github.com/sdispater/pendulum.git
    # or alternatively:
    poetry add git+ssh://git@github.com:sdispater/pendulum.git
    

    If you need to checkout a specific branch, tag or revision, you can specify it when using add:

    poetry add git+https://github.com/sdispater/pendulum.git#develop
    poetry add git+https://github.com/sdispater/pendulum.git#2.0.5
    # or using SSH instead:
    poetry add git+ssh://git@github.com:sdispater/pendulum.git#develop
    poetry add git+ssh://git@github.com:sdispater/pendulum.git#2.0.5
    

    or reference a subdirectory:

    poetry add git+https://github.com/myorg/mypackage_with_subdirs.git@main#subdirectory=subdir
    

    You can also add a local directory or file:

    poetry add ./my-package/
    poetry add ../my-package/dist/my-package-0.1.0.tar.gz
    poetry add ../my-package/dist/my_package-0.1.0.whl
    

    If you want the dependency to be installed in editable mode you can use the --editable option.

    poetry add --editable ./my-package/
    poetry add --editable git+ssh://github.com/sdispater/pendulum.git#develop
    

    Alternatively, you can specify it in the pyproject.toml file. It means that changes in the local directory will be reflected directly in environment.

    [tool.poetry.dependencies]
    my-package = {path = "../my/path", develop = true}
    
    Before poetry 1.1 path dependencies were installed in editable mode by default. You should always set the develop attribute explicitly, to make sure the behavior is the same for all poetry versions.
    The develop attribute is a Poetry-specific feature, so it is not included in the package distribution metadata. In other words, it is only considered when using Poetry to install the project.

    If the package(s) you want to install provide extras, you can specify them when adding the package:

    poetry add "requests[security,socks]"
    poetry add "requests[security,socks]~=2.22.0"
    poetry add "git+https://github.com/pallets/flask.git@1.1.1[dotenv,dev]"
    
    Warning
    Some shells may treat square braces ([ and ]) as special characters. It is suggested to always quote arguments containing these characters to prevent unexpected shell expansion.

    If you want to add a package to a specific group of dependencies, you can use the --group (-G) option:

    poetry add mkdocs --group docs
    

    See Dependency groups for more information about dependency groups.

    Options #

  • --group (-G): The group to add the dependency to.
  • --dev (-D): Add package as development dependency. (Deprecated, use -G dev instead)
  • --editable (-e): Add vcs/path dependencies as editable.
  • --extras (-E): Extras to activate for the dependency. (multiple values allowed)
  • --optional: Add as an optional dependency.
  • --python: Python version for which the dependency must be installed.
  • --platform: Platforms for which the dependency must be installed.
  • --source: Name of the source to use to install the package.
  • --allow-prereleases: Accept prereleases.
  • --dry-run: Output the operations but do not execute anything (implicitly enables –verbose).
  • --lock: Do not perform install (only update the lockfile).
  • remove #

    The remove command removes a package from the current list of installed packages.

    poetry remove pendulum
    

    If you want to remove a package from a specific group of dependencies, you can use the --group (-G) option:

    poetry remove mkdocs --group docs
    

    See Dependency groups for more information about dependency groups.

    Options #

  • --group (-G): The group to remove the dependency from.
  • --dev (-D): Removes a package from the development dependencies. (Deprecated, use -G dev instead)
  • --dry-run : Outputs the operations but will not execute anything (implicitly enables –verbose).
  • --lock: Do not perform operations (only update the lockfile).
  • show #

    To list all the available packages, you can use the show command.

    poetry show
    

    If you want to see the details of a certain package, you can pass the package name.

    poetry show pendulum
    name        : pendulum
    version     : 1.4.2
    description : Python datetimes made easy
    dependencies
     - python-dateutil >=2.6.1
     - tzlocal >=1.4
     - pytzdata >=2017.2.2
    required by
     - calendar >=1.4.0
    

    Options #

  • --without: The dependency groups to ignore.
  • --why: When showing the full list, or a --tree for a single package, display whether they are a direct dependency or required by other packages.
  • --with: The optional dependency groups to include.
  • --only: The only dependency groups to include.
  • --no-dev: Do not list the dev dependencies. (Deprecated, use --only main or --without dev instead)
  • --tree: List the dependencies as a tree.
  • --latest (-l): Show the latest version.
  • --outdated (-o): Show the latest version but only for packages that are outdated.
  • --all (-a): Show all packages (even those not compatible with current system).
  • --top-level (-T): Only show explicitly defined packages.
  • When --only is specified, --with and --without options are ignored.

    build #

    The build command builds the source and wheels archives.

    poetry build
    

    Note that, at the moment, only pure python wheels are supported.

    Options #

  • --format (-f): Limit the format to either wheel or sdist.
  • --output (-o): Set output directory for build artifacts. Default is dist.
  • publish #

    This command publishes the package, previously built with the build command, to the remote repository.

    It will automatically register the package before uploading if this is the first time it is submitted.

    poetry publish
    

    It can also build the package if you pass it the --build option.

    See Publishable Repositories for more information on how to configure and use publishable repositories.

    Options #

  • --repository (-r): The repository to register the package to (default: pypi). Should match a repository name set by the config command.
  • --username (-u): The username to access the repository.
  • --password (-p): The password to access the repository.
  • --cert: Certificate authority to access the repository.
  • --client-cert: Client certificate to access the repository.
  • --dist-dir: Dist directory where built artifact are stored. Default is dist.
  • --build: Build the package before publishing.
  • --dry-run: Perform all actions except upload the package.
  • --skip-existing: Ignore errors from files already existing in the repository.
  • See Configuring Credentials for more information on how to configure credentials.

    config #

    The config command allows you to edit poetry config settings and repositories.

    poetry config --list
    

    Usage #

    poetry config [options] [setting-key] [setting-value1] ... [setting-valueN]
    

    setting-key is a configuration option name and setting-value1 is a configuration value. See Configuration for all available settings.

    Warning

    Use -- to terminate option parsing if your values may start with a hyphen (-), e.g.

    poetry config http-basic.custom-repo gitlab-ci-token -- ${GITLAB_JOB_TOKEN}
    

    Without -- this command will fail if ${GITLAB_JOB_TOKEN} starts with a hyphen.

    Options #

  • --unset: Remove the configuration element named by setting-key.
  • --list: Show the list of current config variables.
  • --local: Set/Get settings that are specific to a project (in the local configuration file poetry.toml).
  • run #

    The run command executes the given command inside the project’s virtualenv.

    poetry run python -V
    

    It can also execute one of the scripts defined in pyproject.toml.

    So, if you have a script defined like this:

    [tool.poetry.scripts]
    my-script = "my_module:main"
    

    You can execute it like so:

    poetry run my-script
    

    Note that this command has no option.

    shell #

    The shell command spawns a shell within the project’s virtual environment.

    By default, the current active shell is detected and used. Failing that, the shell defined via the environment variable SHELL (on *nix) or COMSPEC (on Windows) is used.

    If a virtual environment does not exist, it will be created.

    poetry shell
    

    Note that this command starts a new shell and activates the virtual environment.

    As such, exit should be used to properly exit the shell and the virtual environment instead of deactivate.

    Poetry internally uses the Shellingham project to detect current active shell.

    check #

    The check command validates the content of the pyproject.toml file and its consistency with the poetry.lock file. It returns a detailed report if there are any errors.

    This command is also available as a pre-commit hook. See pre-commit hooks for more information.
    poetry check
    

    Options #

  • --lock: Verifies that poetry.lock exists for the current pyproject.toml.
  • This command searches for packages on a remote index.

    poetry search requests pendulum
    

    lock #

    This command locks (without installing) the dependencies specified in pyproject.toml.

    By default, this will lock all dependencies to the latest available compatible versions. To only refresh the lock file, use the --no-update option. This command is also available as a pre-commit hook. See pre-commit hooks for more information.
    poetry lock
    

    Options #

  • --check: Verify that poetry.lock is consistent with pyproject.toml. (Deprecated) Use poetry check --lock instead.
  • --no-update: Do not update locked versions, only refresh lock file.
  • version #

    This command shows the current version of the project or bumps the version of the project and writes the new version back to pyproject.toml if a valid bump rule is provided.

    The new version should be a valid PEP 440 string or a valid bump rule: patch, minor, major, prepatch, preminor, premajor, prerelease.

    If you would like to use semantic versioning for your project, please see here.

    The table below illustrates the effect of these rules with concrete examples.

    before after
  • --next-phase: Increment the phase of the current version.
  • --short (-s): Output the version number only.
  • --dry-run: Do not update pyproject.toml file.
  • export #

    This command exports the lock file to other formats.

    poetry export -f requirements.txt --output requirements.txt
    
    Warning
    This command is provided by the Export Poetry Plugin. In a future version of Poetry this plugin will not be installed by default anymore. In order to avoid a breaking change and make your automation forward-compatible, please install poetry-plugin-export explicitly. See Using plugins for details on how to install a plugin.
    This command is also available as a pre-commit hook. See pre-commit hooks for more information.
    Unlike the install command, this command only includes the project’s dependencies defined in the implicit main group defined in tool.poetry.dependencies when used without specifying any options.

    Options #

  • --format (-f): The format to export to (default: requirements.txt). Currently, only constraints.txt and requirements.txt are supported.
  • --output (-o): The name of the output file. If omitted, print to standard output.
  • --dev: Include development dependencies. (Deprecated, use --with dev instead)
  • --extras (-E): Extra sets of dependencies to include.
  • --without: The dependency groups to ignore.
  • --with: The optional dependency groups to include.
  • --only: The only dependency groups to include.
  • --without-hashes: Exclude hashes from the exported file.
  • --without-urls: Exclude source repository urls from the exported file.
  • --with-credentials: Include credentials for extra indices.
  • env #

    The env command regroups sub commands to interact with the virtualenvs associated with a specific project.

    See Managing environments for more information about these commands.

    cache #

    The cache command regroups sub commands to interact with Poetry’s cache.

    cache list #

    The cache list command lists Poetry’s available caches.

    poetry cache list
    

    cache clear #

    The cache clear command removes packages from a cached repository.

    For example, to clear the whole cache of packages from the pypi repository, run:

    poetry cache clear pypi --all
    

    To only remove a specific package from a cache, you have to specify the cache entry in the following form cache:package:version:

    poetry cache clear pypi:requests:2.24.0
    

    source #

    The source namespace regroups sub commands to manage repository sources for a Poetry project.

    source add #

    The source add command adds source configuration to the project.

    For example, to add the pypi-test source, you can run:

    poetry source add pypi-test https://test.pypi.org/simple/
    

    You cannot use the name pypi for a custom repository as it is reserved for use by the default PyPI source. However, you can set the priority of PyPI:

    poetry source add --priority=explicit pypi
    

    Options #

  • --default: Set this source as the default (disable PyPI). Deprecated in favor of --priority.
  • --secondary: Set this source as a secondary source. Deprecated in favor of --priority.
  • --priority: Set the priority of this source. Accepted values are: default, secondary, supplemental, and explicit. Refer to the dedicated sections in Repositories for more information.
  • At most one of the options above can be provided. See package sources for more information.

    source show #

    The source show command displays information on all configured sources for the project.

    poetry source show
    

    Optionally, you can show information of one or more sources by specifying their names.

    poetry source show pypi-test
    
    This command will only show sources configured via the pyproject.toml and does not include the implicit default PyPI.

    source remove #

    The source remove command removes a configured source from your pyproject.toml.

    poetry source remove pypi-test
    

    about #

    The about command displays global information about Poetry, including the current version and version of poetry-core.

    poetry about
    

    help #

    The help command displays global help, or help for a specific command.

    To display global help:

    poetry help
    

    To display help for a specific command, for instance show:

    poetry help show
    

    The --help option can also be passed to any command to get help for a specific command.

    For instance:

    poetry show --help
    

    list #

    The list command displays all the available Poetry commands.

    poetry list
    

    self #

    The self namespace regroups sub commands to manage the Poetry installation itself.

    Use of these commands will create the required pyproject.toml and poetry.lock files in your configuration directory.
    Warning
    Especially on Windows, self commands that update or remove packages may be problematic so that other methods for installing plugins and updating Poetry are recommended. See Using plugins and Installing Poetry for more information.

    self add #

    The self add command installs Poetry plugins and make them available at runtime. Additionally, it can also be used to upgrade Poetry’s own dependencies or inject additional packages into the runtime environment

    The self add command works exactly like the add command. However, is different in that the packages managed are for Poetry’s runtime environment.

    The package specification formats supported by the self add command are the same as the ones supported by the add command.

    For example, to install the poetry-plugin-export plugin, you can run:

    poetry self add poetry-plugin-export
    

    To update to the latest poetry-core version, you can run:

    poetry self add poetry-core@latest
    

    To add a keyring provider artifacts-keyring, you can run:

    poetry self add artifacts-keyring
    

    Options #

  • --editable (-e): Add vcs/path dependencies as editable.
  • --extras (-E): Extras to activate for the dependency. (multiple values allowed)
  • --allow-prereleases: Accept prereleases.
  • --source: Name of the source to use to install the package.
  • --dry-run: Output the operations but do not execute anything (implicitly enables –verbose).
  • self update #

    The self update command updates Poetry version in its current runtime environment.

    The self update command works exactly like the update command. However, is different in that the packages managed are for Poetry’s runtime environment.
    poetry self update
    

    Options #

  • --preview: Allow the installation of pre-release versions.
  • --dry-run: Output the operations but do not execute anything (implicitly enables –verbose).
  • self lock #

    The self lock command reads this Poetry installation’s system pyproject.toml file. The system dependencies are locked in the corresponding poetry.lock file.

    poetry self lock
    

    Options #

  • --check: Verify that poetry.lock is consistent with pyproject.toml. (Deprecated)
  • --no-update: Do not update locked versions, only refresh lock file.
  • self show #

    The self show command behaves similar to the show command, but working within Poetry’s runtime environment. This lists all packages installed within the Poetry install environment.

    To show only additional packages that have been added via self add and their dependencies use self show --addons.

    poetry self show
    

    Options #

  • --addons: List only add-on packages installed.
  • --tree: List the dependencies as a tree.
  • --latest (-l): Show the latest version.
  • --outdated (-o): Show the latest version but only for packages that are outdated.
  • self show plugins #

    The self show plugins command lists all the currently installed plugins.

    poetry self show plugins
    

    self remove #

    The self remove command removes an installed addon package.

    poetry self remove poetry-plugin-export
    

    Options #

  • --dry-run: Outputs the operations but will not execute anything (implicitly enables –verbose).
  • self install #

    The self install command ensures all additional packages specified are installed in the current runtime environment.

    The self install command works similar to the install command. However, is different in that the packages managed are for Poetry’s runtime environment.
    poetry self install --sync
    

    Options #

  • --sync: Synchronize the environment with the locked packages and the specified groups.
  • --dry-run: Output the operations but do not execute anything (implicitly enables –verbose).
  •