old_contents: from rdkit import Chem
  from mordred import Calculator, descriptors
  
  mols = [
      Chem.MolFromSmiles('c1ccccc1'),
      Chem.MolFromSmiles('c1ccccc1Cl'),
      Chem.MolFromSmiles('c1ccccc1C'),
  ]
  
  # Create Calculator
  calc = Calculator(descriptors)
  
  # map method calculate multiple molecules (return generator)
  print(list(calc.map(mols)))
  
  # pandas method calculate multiple molecules (return pandas DataFrame)
  print(calc.pandas(mols))
  
new_contents: from multiprocessing import freeze_support
  
  from rdkit import Chem
  
  from mordred import Calculator, descriptors
  
  freeze_support()
  
  mols = [
      Chem.MolFromSmiles("c1ccccc1"),
      Chem.MolFromSmiles("c1ccccc1Cl"),
      Chem.MolFromSmiles("c1ccccc1C"),
  ]
  
  # Create Calculator
  calc = Calculator(descriptors)
  
  # map method calculate multiple molecules (return generator)
  print(list(calc.map(mols)))
  
  # pandas method calculate multiple molecules (return pandas DataFrame)
  print(calc.pandas(mols))
  
subject: fix example