Iodata

Latest version: v0.1.3

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1.0.0

Originally, IOData was a subpackage of HORTON2. It is currently factored out,
modernized and ported to Python 3. In this process, the API was seriously
refactored, essentially designed from scratch. Compared to HORTON2, IOData 1.0.0
contains the following API-breaking changes:

* The user-facing API is now a set of four *free* functions:
:py:func:`iodata.api.load_one`, :py:func:`iodata.api.dump_one`,
:py:func:`iodata.api.load_many`, :py:func:`iodata.api.dump_many`.
* The :py:class:`iodata.iodata.IOData` object is implemented with the
`attrs <https://www.attrs.org>`_ module, which facilites type hinting and
checking.
* The ``load_many`` and ``dump_many`` functions can handle trajectories and
database formats. (At the time of writing, only XYZ and FCHK are supported.)
* IOData does not impose a specific ordering of the atomic orbital basis
functions (within one shell). Practically all possible conventions are
supported and one can easily convert from one to another.
* All attributes of IOData are either built-in Python types, Numpy arrays or
NamedTuples defined in IOData. It no longer relies on other parts of HORTON2
to define these data types. (This is most relevant for the orbital basis,
the molecular orbitals and the cube data.)
* Nearly all attributes of the IOData class have been renamed to more systematic
terminology.
* All file format modules have an identical API (and therefore do not fit into
a single namespace).
* Ghost atoms are now loaded as atoms with a zero effective core charge
(``atcorenums``).
* Spin multiplicity is no longer used. Instead, the spin polarization is stored
`= abs(nalpha - nbeta)`.
* The internal HDF5 file format support has been removed.
* Many smaller changes have been made, which would be too tedious to be listed
here.

In addition, several new attributes were added to the ``IOData`` class, and
several of them can also be read from file formats we already supported
previously. This work will be expanded upon in future releases.

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