code: def _get_paths(self, fullname):
          
          real_path = os.path.join(*fullname[len(self.package_prefix):].split('.'))
          for base_path in sys.path:
              if base_path == '':
                  # Empty string means process's cwd
                  base_path = os.getcwd()
              path = os.path.join(base_path, real_path)
              yield path + '.ipynb'
              yield path + '.py'
              yield os.path.join(path, '__init__.ipynb')
              yield os.path.join(path, '__init__.py')
docs: Generate ordered list of paths we should look for fullname module in