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deptry is a command line tool to check for issues with dependencies in a Python project, such as obsolete or missing dependencies. It supports the following types of projects:

  • Projects that use Poetry and a corresponding pyproject.toml file
  • Projects that use PDM and a corresponding pyproject.toml file
  • Projects that use any package manager that strictly follows PEP 621 dependency specification
  • Projects that use a requirements.txt file according to the pip standards

Dependency issues are detected by scanning for imported modules within all Python files in a directory and its subdirectories, and comparing those to the dependencies listed in the project's requirements.



deptry can be added to your project with:

poetry add --group dev deptry

or with:

pip install deptry


When using pip to install deptry, make sure you install it within the virtual environment of your project. Installing deptry globally will not work, since it needs to have access to the metadata of the packages in the virtual environment.


deptry should be run within the root directory of the project to be scanned, and the project should be running in its own dedicated virtual environment.


To scan your project for dependency issues, run

deptry .

deptry can be configured by using additional command line arguments, or by adding a [tool.deptry] section in pyproject.toml. For more information, see Usage and Configuration