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Introduction#

PDM, as described, is a modern Python package and dependency manager supporting the latest PEP standards. But it is more than a package manager. It boosts your development workflow in various aspects. The most significant benefit is it installs and manages packages in a similar way to npm that doesn't need to create a virtualenv at all!

Feature highlights#

  • Simple and fast dependency resolver, mainly for large binary distributions.
  • A PEP 517 build backend.
  • PEP 621 project metadata.
  • Flexible and powerful plug-in system.
  • Versatile user scripts.
  • Opt-in centralized installation cache like pnpm.

Installation#

PDM requires Python 3.7+ to be installed. It works on multiple platforms including Windows, Linux and MacOS.

Note

You can still have your project working on lower Python versions, read how to do it here.

PDM requires python version 3.7 or higher.

Like Pip, PDM provides an installation script that will install PDM into an isolated environment.

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curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python3 -

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(Invoke-WebRequest -Uri https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py -UseBasicParsing).Content | python -

For security reasons, you should verify the checksum of install-pdm.py. The sha256 checksum is: ce0a116987b2667231391d13dd005006433114033cac74aa18f0b2dec5538d03

The installer will install PDM into the user site and the location depends on the system:

  • $HOME/.local/bin for Unix
  • %APPDATA%\Python\Scripts on Windows

You can pass additional options to the script to control how PDM is installed:

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usage: install-pdm.py [-h] [-v VERSION] [--prerelease] [--remove] [-p PATH] [-d DEP]

optional arguments:
  -h, --help            show this help message and exit
  -v VERSION, --version VERSION | envvar: PDM_VERSION
                        Specify the version to be installed, or HEAD to install from the main branch
  --prerelease | envvar: PDM_PRERELEASE    Allow prereleases to be installed
  --remove | envvar: PDM_REMOVE            Remove the PDM installation
  -p PATH, --path PATH | envvar: PDM_HOME  Specify the location to install PDM
  -d DEP, --dep DEP | envvar: PDM_DEPS     Specify additional dependencies, can be given multiple times

You can either pass the options after the script or set the env var value.

Other installation methods#

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brew install pdm

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scoop bucket add frostming https://github.com/frostming/scoop-frostming.git
scoop install pdm

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pipx install pdm

Install the head version of GitHub repository. Make sure you have installed Git LFS on your system.

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pipx install git+https://github.com/pdm-project/pdm.git@main#egg=pdm

See also: https://pypa.github.io/pipx/

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pip install --user pdm

Assuming you have asdf installed. 

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asdf plugin add pdm
asdf local pdm latest
asdf install pdm

By copying the Pyprojectx wrapper scripts to a project, you can install PDM as (npm-style) dev dependency inside that project. This allows different projects/branches to use different PDM versions.

To initialize a new or existing project, cd into the project folder and:

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curl -LO https://github.com/pyprojectx/pyprojectx/releases/latest/download/wrappers.zip && unzip wrappers.zip && rm -f wrappers.zip
./pw --init pdm

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Invoke-WebRequest https://github.com/pyprojectx/pyprojectx/releases/latest/download/wrappers.zip -OutFile wrappers.zip; Expand-Archive -Path wrappers.zip -DestinationPath .; Remove-Item -Path wrappers.zip
.\pw --init pdm

Update the PDM version#

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pdm self update

Packaging Status#

Packaging status

Shell Completion#

PDM supports generating completion scripts for Bash, Zsh, Fish or Powershell. Here are some common locations for each shell:

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pdm completion bash > /etc/bash_completion.d/pdm.bash-completion

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# Make sure ~/.zfunc is added to fpath, before compinit.
pdm completion zsh > ~/.zfunc/_pdm

Oh-My-Zsh:

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mkdir $ZSH_CUSTOM/plugins/pdm
pdm completion zsh > $ZSH_CUSTOM/plugins/pdm/_pdm

Then make sure pdm plugin is enabled in ~/.zshrc

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pdm completion fish > ~/.config/fish/completions/pdm.fish

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# Create a directory to store completion scripts
mkdir $PROFILE\..\Completions
echo @'
Get-ChildItem "$PROFILE\..\Completions\" | ForEach-Object {
    . $_.FullName
}
'@ | Out-File -Append -Encoding utf8 $PROFILE
# Generate script
Set-ExecutionPolicy Unrestricted -Scope CurrentUser
pdm completion powershell | Out-File -Encoding utf8 $PROFILE\..\Completions\pdm_completion.ps1

Virtualenv and PEP 582#

PDM offers experimental support for PEP 582 as an opt-in feature, in addition to virtualenv management. Although the Python Steering Council has rejected PEP 582, you can still test it out using PDM.

To learn more about the two modes, refer to the relevant chapters on Working with virtualenv and Working with PEP 582.

PDM Eco-system#

Awesome PDM is a curated list of awesome PDM plugins and resources.

Sponsors#