httk.atomistic.models.formula.formula
=====================================

.. py:module:: httk.atomistic.models.formula.formula

.. autoapi-nested-parse::

   The canonical reduced chemical-formula value class.



Classes
-------

.. autoapisummary::

   httk.atomistic.models.formula.formula.ChemicalFormula


Module Contents
---------------

.. py:class:: ChemicalFormula(backend, **hints)

   Bases: :py:obj:`httk.atomistic.models.formula.backend.ChemicalFormulaBackend`, :py:obj:`str`


   Store a strictly canonical reduced chemical formula.

   :param formula: The alphabetical formula text with greatest common divisor one.


   .. py:property:: amounts
      :type: tuple[tuple[str, fractions.Fraction], Ellipsis]


      Return the formula coefficients as exact amounts.