code: def should_skip_file(name):
      
      if name.startswith('.'):
          return 'Skipping hidden file %(filename)s'
      if name.endswith('~') or name.endswith('.bak'):
          return 'Skipping backup file %(filename)s'
      if name.endswith('.pyc') or name.endswith('.pyo'):
          return 'Skipping %s file ' % os.path.splitext(name)[1] + '%(filename)s'
      if name.endswith('$py.class'):
          return 'Skipping $py.class file %(filename)s'
      if name in ('CVS', '_darcs'):
          return 'Skipping version control directory %(filename)s'
      return None
docs: Checks if a file should be skipped based on its name.
  
      If it should be skipped, returns the reason, otherwise returns
      None.