Add Class

Create a new class to implement the feature.
This is typically a wrapper around the functions you wrote in the previous step.

Choose a base

• BuilderABC – when key/parameter checking is useful.
• dataclass – for simple, immutable data containers.
• Regular class – for everything else.

Required Sections

• __init__ with complete type hints.
• Public interface first (getters, setters, actions).
• Docstring that includes an “Examples” subsection.
• Follow Code Specifications for formatting.

Steps

1. Create a new issue on GitHub and assign it to yourself.
2. Create a branch on your forked repo for this issue.
3. Add a new class(s) to the appropriate module in particula//.
   • If the module is new, add it to __init__.py.
   • Use ABC for abstract classes and BuilderABC for builders.
   • Call your functions in the class methods and keep most calculations in the functions (not directly in the class).
4. Write a docstring.
5. Add type hints for all parameters and return values.
6. Add unit tests for the class (see Add Unit Tests).
7. Commit this file in a branch.
8. Create your pull‑request to the main repo.