text: """Deprecated in favor of Bio.PDB.vectors to solve name collision.
  
  Historically the meaning of ``Bio.PDB.Vector`` has been ambiguous,
  both a class ``Vector`` and the module which defines this class
  and related functions (``Bio/PDB/Vector.py``).
  
  The module has been renamed to ``Bio.PDB.vectors`` (lower case
  in line with PEP8 guidelines).
  
  Please use the following style imports in order to work on both
  old and new versions of Biopython:
  
  >>> from Bio.PDB import calc_angle
  >>> from Bio.PDB import calc_dihedral
  >>> from Bio.PDB import m2rotaxis
  >>> from Bio.PDB import refmat
  >>> from Bio.PDB import rotaxis2m
  >>> from Bio.PDB import rotmat
  >>> from Bio.PDB import vector_to_axis
  >>> from Bio.PDB import Vector  # for the class
  
  """
  
  import warnings
  
  from .vectors import m2rotaxis, vector_to_axis, rotaxis2m
  from .vectors import refmat, rotmat, calc_angle, calc_dihedral
  from .vectors import Vector  # the class whose name clashed
  
  from Bio import BiopythonDeprecationWarning
  
  warnings.warn("The module Bio.PDB.Vector has been deprecated in "
                "favor of new module Bio.PDB.vectors to solve a "
                "name collision with the class Vector. For the "
                "class Vector, and vector functions like calc_angle, "
                "import from Bio.PDB instead.", BiopythonDeprecationWarning)
  