Open Anharmonic is a Python 3 wrapper for computational chemistry software packages intended to enable VPT2 computation of anharmonic vibrational constants. Note that no VPT2 capabilities are implemented as of yet.

Other types of calculations are under consideration.

An adjunct goal of the project is to expose an API providing convenient access to various results of standalone calculations, as well as tools to manipulate those results.

Any branches with a prefixed v. are volatile (under active development). The history there may be rewritten dramatically, without warning.

Starting with v0.4, this project strives to follow Semantic Versioning v2.0.0 and PEP 440, with PEP 440 taking priority. Thus, per PEP 440, some elements of SemVer v2.0.0 may not be reflected in the official version numbers of the project.

Documentation can be found at Read the Docs:

QuantifiedCode project analysis of dev branch: