old_contents: from __future__ import print_function, division
  import time
  from .delay_import import import_
  from .arrays import ensure_type
  from .unit import in_units_of
  from .unitcell import (lengths_and_angles_to_box_vectors,
                         box_vectors_to_lengths_and_angles)
  
  __all__ = ["ensure_type", "import_", "in_units_of",
      "lengths_and_angles_to_box_vectors", "box_vectors_to_lengths_and_angles",
      "ilen", "timing"]
  
  
  def ilen(iterable):
      """Length of an iterator. Note, this consumes the iterator
  
      Parameters
      ----------
      iterable : iterable
          An iterable, such as a generator, list, etc.
  
      Returns
      -------
      length  : int
          The number of elements in the iterable
      """
      return sum(1 for _ in iterable)
  
  
  class timing(object):
      """A timing context manager
  
      Example
      -------
      >>> with timing('long function'):
      >>>    long_function()
      long function: 0.500 seconds
      """
      def __init__(self, name='block'):
          self.name = name
      
      def __enter__(self):
          self.start = time.time()
      
      def __exit__(self, ty, val, tb):
          end = time.time()
          print("%s : %0.3f seconds" % (self.name, end - self.start))
          return False
  
new_contents: from __future__ import print_function, division
  import time
  from .delay_import import import_
  from .arrays import ensure_type
  from .unit import in_units_of
  from .unitcell import (lengths_and_angles_to_box_vectors,
                         box_vectors_to_lengths_and_angles)
  
  __all__ = ["ensure_type", "import_", "in_units_of",
      "lengths_and_angles_to_box_vectors", "box_vectors_to_lengths_and_angles",
      "ilen", "timing"]
  
  
  def ilen(iterable):
      """Length of an iterator. Note, this consumes the iterator
  
      Parameters
      ----------
      iterable : iterable
          An iterable, such as a generator, list, etc.
  
      Returns
      -------
      length  : int
          The number of elements in the iterable
      """
      return sum(1 for _ in iterable)
  
  
  class timing(object):
      """A timing context manager
  
      Example
      -------
      >>> with timing('long function'):
      >>>    long_function()
      long function: 0.500 seconds
      """
      def __init__(self, name='block'):
          self.name = name
          self.time = 0
          self.start = None
          self.end = None
      
      def __enter__(self):
          self.start = time.time()
      
      def __exit__(self, ty, val, tb):
          self.end = time.time()
          self.time = self.end - self.start
          print("%s : %0.3f seconds" % (self.name, self.time)
          return False
  
subject: Update __init__.py