old_contents: # -*- coding: utf-8 -*-
  """
  ===============================================================================
  Class representations of nature's building blocks (:mod:`sknano.core.atoms`)
  ===============================================================================
  
  .. currentmodule:: sknano.core.atoms
  
  Contents
  ========
  
  The `Atom` class represents a single atom. The `Atoms` class is a container
  class for `Atom` class instances. Every new atom class has a corresponding
  container class.
  
  Base classes:
  
  .. autosummary::
     :toctree: generated/
  
     Atom
     Atoms
  
  Atoms with an eXtended set of attributes:
  
  .. autosummary::
     :toctree: generated/
  
     XAtom
     XAtoms
  
  Atoms for nearest-neighbor structure analysis:
  
  .. autosummary::
     :toctree: generated/
  
     KDTAtom
     KDTAtoms
  
  Atoms and data structures for POAV structure analysis:
  
  .. autosummary::
     :toctree: generated/
  
     POAVAtom
     POAVAtoms
     POAVMixin
     POAV
     POAV1
     POAV2
     POAVR
  
  Class representation of atom bonds.
  
  .. autosummary::
     :toctree: generated/
  
     Bond
     Bonds
  
  Classes for structure analysis
  
  .. autosummary::
     :toctree: generated/
  
     NeighborAtoms
  
  Classes for molecular dynamics simulations:
  
  .. autosummary::
     :toctree: generated/
  
     Trajectory
     Snapshot
  
  """
  from __future__ import absolute_import, division, print_function
  __docformat__ = 'restructuredtext en'
  
  from ._atom import *
  from ._atoms import *
  #from ._base import *
  from ._bond import *
  from ._bonds import *
  from ._extended_atom import *
  from ._extended_atoms import *
  from ._kdtree_atom import *
  from ._kdtree_atoms import *
  from ._neighbor_atoms import *
  from ._poav_atom import *
  from ._poav_atoms import *
  from ._structure_atoms import *
  from ._trajectory import *
  
  __all__ = [s for s in dir() if not s.startswith('_')]
  
new_contents: # -*- coding: utf-8 -*-
  """
  ===============================================================================
  Class representations of nature's building blocks (:mod:`sknano.core.atoms`)
  ===============================================================================
  
  .. currentmodule:: sknano.core.atoms
  
  Contents
  ========
  
  The `Atom` class represents a single atom. The `Atoms` class is a container
  class for `Atom` class instances. Every new atom class has a corresponding
  container class.
  
  Base classes:
  
  .. autosummary::
     :toctree: generated/
  
     Atom
     Atoms
  
  Atoms with an eXtended set of attributes:
  
  .. autosummary::
     :toctree: generated/
  
     XAtom
     XAtoms
  
  Atoms for nearest-neighbor structure analysis:
  
  .. autosummary::
     :toctree: generated/
  
     KDTAtom
     KDTAtoms
  
  Atoms and data structures for POAV structure analysis:
  
  .. autosummary::
     :toctree: generated/
  
     POAVAtom
     POAVAtoms
     POAVAtomMixin
     POAV
     POAV1
     POAV2
     POAVR
  
  Class representation of atom bonds.
  
  .. autosummary::
     :toctree: generated/
  
     Bond
     Bonds
  
  Classes for structure analysis
  
  .. autosummary::
     :toctree: generated/
  
     NeighborAtoms
  
  Classes for molecular dynamics simulations:
  
  .. autosummary::
     :toctree: generated/
  
     Trajectory
     Snapshot
  
  """
  from __future__ import absolute_import, division, print_function
  __docformat__ = 'restructuredtext en'
  
  from ._atom import *
  from ._atoms import *
  #from ._base import *
  from ._bond import *
  from ._bonds import *
  from ._extended_atom import *
  from ._extended_atoms import *
  from ._kdtree_atom import *
  from ._kdtree_atoms import *
  from ._neighbor_atoms import *
  from ._poav_atom import *
  from ._poav_atoms import *
  from ._structure_atoms import *
  from ._trajectory import *
  
  __all__ = [s for s in dir() if not s.startswith('_')]
  
subject: fix docstring directive