code: def is_relative(modname, from_file):
      
      if not os.path.isdir(from_file):
          from_file = os.path.dirname(from_file)
      if from_file in sys.path:
          return False
      try:
          stream, _, _ = imp.find_module(modname.split(".")[0], [from_file])
  
          # Close the stream to avoid ResourceWarnings.
          if stream:
              stream.close()
          return True
      except ImportError:
          return False
docs: return true if the given module name is relative to the given
      file name
  
      :type modname: str
      :param modname: name of the module we are interested in
  
      :type from_file: str
      :param from_file:
        path of the module from which modname has been imported
  
      :rtype: bool
      :return:
        true if the module has been imported relatively to `from_file`