old_contents: from . import layers
  from . import utils
  from . import nputils
  from . import tbutils
  from . import distributions
  from .utils import FileWriter
  from .tbutils import function
  
new_contents: import sys
  from . import layers
  from . import utils
  from . import nputils
  from . import tbutils
  from . import distributions
  from .utils import FileWriter
  from .tbutils import function
  
  if 'ipykernel' in sys.argv[0]:
      from . import nbutils
  
subject: Add nbutils import to base import