code: def _is_dynamic(module):
      
      # Quick check: module that have __file__ attribute are not dynamic modules.
      if hasattr(module, '__file__'):
          return False
  
      if hasattr(module, '__spec__'):
          return module.__spec__ is None
      else:
          # Backward compat for Python 2
          import imp
          try:
              path = None
              for part in module.__name__.split('.'):
                  if path is not None:
                      path = [path]
                  f, path, description = imp.find_module(part, path)
                  if f is not None:
                      f.close()
          except ImportError:
              return True
          return False
docs: Return True if the module is special module that cannot be imported by its
      name.