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

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

.. autoapi-nested-parse::

   Backend wrapping a raw canonical reduced formula string.



Classes
-------

.. autoapisummary::

   httk.atomistic.models.formula.formula_string.FormulaString


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

.. py:class:: FormulaString(obj, **hints)

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


   Wrap a canonical reduced formula held as a plain string.

   :param obj: The canonical reduced formula text.
   :param \*\*hints: Backend-selection hints.


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


      Return the formula coefficients as exact amounts.


   .. py:method:: unwrap()

      Return the original formula text.