old_contents: """
  Making it easy to import in classes.
  """
  from deepchem.feat.base_classes import Featurizer
  from deepchem.feat.base_classes import MolecularFeaturizer
  from deepchem.feat.base_classes import MaterialStructureFeaturizer
  from deepchem.feat.base_classes import MaterialCompositionFeaturizer
  from deepchem.feat.base_classes import ComplexFeaturizer
  from deepchem.feat.base_classes import UserDefinedFeaturizer
  from deepchem.feat.graph_features import ConvMolFeaturizer
  from deepchem.feat.graph_features import WeaveFeaturizer
  from deepchem.feat.fingerprints import CircularFingerprint
  from deepchem.feat.rdkit_descriptors import RDKitDescriptors
  from deepchem.feat.coulomb_matrices import CoulombMatrix
  from deepchem.feat.coulomb_matrices import CoulombMatrixEig
  from deepchem.feat.coulomb_matrices import BPSymmetryFunctionInput
  from deepchem.feat.rdkit_grid_featurizer import RdkitGridFeaturizer
  from deepchem.feat.binding_pocket_features import BindingPocketFeaturizer
  from deepchem.feat.one_hot import OneHotFeaturizer
  from deepchem.feat.raw_featurizer import RawFeaturizer
  from deepchem.feat.atomic_coordinates import AtomicCoordinates
  from deepchem.feat.atomic_coordinates import NeighborListComplexAtomicCoordinates
  from deepchem.feat.adjacency_fingerprints import AdjacencyFingerprint
  from deepchem.feat.smiles_featurizers import SmilesToSeq, SmilesToImage
  from deepchem.feat.material_featurizers import ElementPropertyFingerprint
  from deepchem.feat.material_featurizers import SineCoulombMatrix
  from deepchem.feat.material_featurizers import CGCNNFeaturizer
  
  try:
    import transformers
    from transformers import BertTokenizer
  
    from deepchem.feat.smiles_tokenizer import SmilesTokenizer
    from deepchem.feat.smiles_tokenizer import BasicSmilesTokenizer
  except ModuleNotFoundError:
    # logger.warning("HuggingFace transformers is not available. Please install using 'pip install transformers' to use the SmilesTokenizer")
    print("Transformers package not installed, SmilesTokenizer can not be used.")
    print("Install using 'pip install transformers'")
    pass
  
  
  
  
new_contents: """
  Making it easy to import in classes.
  """
  from deepchem.feat.base_classes import Featurizer
  from deepchem.feat.base_classes import MolecularFeaturizer
  from deepchem.feat.base_classes import MaterialStructureFeaturizer
  from deepchem.feat.base_classes import MaterialCompositionFeaturizer
  from deepchem.feat.base_classes import ComplexFeaturizer
  from deepchem.feat.base_classes import UserDefinedFeaturizer
  from deepchem.feat.graph_features import ConvMolFeaturizer
  from deepchem.feat.graph_features import WeaveFeaturizer
  from deepchem.feat.fingerprints import CircularFingerprint
  from deepchem.feat.rdkit_descriptors import RDKitDescriptors
  from deepchem.feat.coulomb_matrices import CoulombMatrix
  from deepchem.feat.coulomb_matrices import CoulombMatrixEig
  from deepchem.feat.coulomb_matrices import BPSymmetryFunctionInput
  from deepchem.feat.rdkit_grid_featurizer import RdkitGridFeaturizer
  from deepchem.feat.binding_pocket_features import BindingPocketFeaturizer
  from deepchem.feat.one_hot import OneHotFeaturizer
  from deepchem.feat.raw_featurizer import RawFeaturizer
  from deepchem.feat.atomic_coordinates import AtomicCoordinates
  from deepchem.feat.atomic_coordinates import NeighborListComplexAtomicCoordinates
  from deepchem.feat.adjacency_fingerprints import AdjacencyFingerprint
  from deepchem.feat.smiles_featurizers import SmilesToSeq, SmilesToImage
  from deepchem.feat.material_featurizers import ElementPropertyFingerprint
  from deepchem.feat.material_featurizers import SineCoulombMatrix
  from deepchem.feat.material_featurizers import CGCNNFeaturizer
  
  try:
    from logging import getLogger
    logger = getLogger(__name__)
    import transformers
    from transformers import BertTokenizer
  
    from deepchem.feat.smiles_tokenizer import SmilesTokenizer
    from deepchem.feat.smiles_tokenizer import BasicSmilesTokenizer
  except ModuleNotFoundError:
    logger.warning("HuggingFace transformers is not available. Please install using 'pip install transformers' to use the SmilesTokenizer")
  
  
  
  
subject: remove print, use logger