We are pleased to announce the release of PlasmaPy version 0.4.0. This release adds several new functions to plasmapy.formulary, aliases (with trailing underscores) for the most commonly used formulary functions, classes to represent custom and dimensionless particles, and a new module in plasmapy.diagnostics for Thomson scattering. The plasmapy.atomic subpackage was renamed to plasmapy.particles as part of an ongoing plan to reorganize PlasmaPy's subpackage structure.

In order to install PlasmaPy, please refer to the installation instructions on PlasmaPy's documentation page.