old_contents: # -*- coding: utf-8 -*-
  """
  Extension that omits the creation of file `skeleton.py`
  """
  
  from ..api import Extension, helpers
  
  
  class NoSkeleton(Extension):
      """Omit creation of skeleton.py and test_skeleton.py"""
      def activate(self, actions):
          """Activate extension
  
          Args:
              actions (list): list of actions to perform
  
          Returns:
              list: updated list of actions
          """
          return self.register(
              actions,
              self.remove_files,
              after='define_structure')
  
      def remove_files(self, struct, opts):
          """Remove all skeleton files from structure
  
          Args:
              struct (dict): project representation as (possibly) nested
                  :obj:`dict`.
              opts (dict): given options, see :obj:`create_project` for
                  an extensive list.
  
          Returns:
              struct, opts: updated project representation and options
          """
          # Namespace is not yet applied so deleting from package is enough
          file = [opts['project'], 'src', opts['package'], 'skeleton.py']
          struct = helpers.reject(struct, file)
          file = [opts['project'], 'tests', 'test_skeleton.py']
          struct = helpers.reject(struct, file)
          return struct, opts
  
new_contents: # -*- coding: utf-8 -*-
  """
  Extension that omits the creation of file `skeleton.py`
  """
  
  from pathlib import PurePath as Path
  
  from ..api import Extension, helpers
  
  
  class NoSkeleton(Extension):
      """Omit creation of skeleton.py and test_skeleton.py"""
      def activate(self, actions):
          """Activate extension
  
          Args:
              actions (list): list of actions to perform
  
          Returns:
              list: updated list of actions
          """
          return self.register(
              actions,
              self.remove_files,
              after='define_structure')
  
      def remove_files(self, struct, opts):
          """Remove all skeleton files from structure
  
          Args:
              struct (dict): project representation as (possibly) nested
                  :obj:`dict`.
              opts (dict): given options, see :obj:`create_project` for
                  an extensive list.
  
          Returns:
              struct, opts: updated project representation and options
          """
          # Namespace is not yet applied so deleting from package is enough
          file = Path(opts['project'], 'src', opts['package'], 'skeleton.py')
          struct = helpers.reject(struct, file)
          file = Path(opts['project'], 'tests', 'test_skeleton.py')
          struct = helpers.reject(struct, file)
          return struct, opts
  
subject: Change extensions to use pathlib in helpers instead of lists