text: # coding: utf-8
  # Copyright (c) Pymatgen Development Team.
  # Distributed under the terms of the MIT License.
  
  """
  This module provides utilities to chunk large sequences and display progress
  bars during processing.
  """
  
  import math
  
  
  def get_chunks(sequence, size=1):
      """
      Args:
          sequence ():
          size ():
  
      Returns:
  
      """
      chunks = int(math.ceil(len(sequence) / float(size)))
      return [sequence[i * size : (i + 1) * size] for i in range(chunks)]
  
  
  class PBarSafe:
      """
      Progress bar.
      """
  
      def __init__(self, total):
          """
          Args:
              total (): Total value.
          """
          self.total = total
          self.done = 0
          self.report()
  
      def update(self, amount):
          """
          Update progress bar by amount.
  
          Args:
              amount (float):
          """
          self.done += amount
          self.report()
  
      def report(self):
          """
          Print progress.
          """
          print("{} of {} done {:.1%}".format(self.done, self.total, self.done / self.total))
  
  
  try:
      # noinspection PyUnresolvedReferences
      if get_ipython().__class__.__name__ == "ZMQInteractiveShell":  # type: ignore
          from tqdm import tqdm_notebook as PBar
      else:  # likely 'TerminalInteractiveShell'
          from tqdm import tqdm as PBar
  except NameError:
      try:
          from tqdm import tqdm as PBar
      except ImportError:
          PBar = PBarSafe
  except ImportError:
      PBar = PBarSafe
  