Single-file KISS-engineered Python package offering adiabatic parcel model with moving-sectional/point-particle representation of cloud condensation nuclei (CCN) activation process, i.e. the key mechanism responsible for formation of cloud droplets in the atmosphere. The package is lightweight in dependencies - depends on SciPy, NumPy & Pint only. It offers sub-second execution times for typical parameter settings, and allows for using user-defined values for all constants use in the model. The source code is written leveraging dimensional analysis abstractions thus allowing to ensure at test time that all arithmetic expressions are valid in terms of physical dimensions, while not incurring any overhead outside of the test session scope.