code: def listFileParentsByLumi(self, **kwargs):
          
          validParameters = ['block_name', 'logical_file_name']
  
          requiredParameters = {'forced': ['block_name']}
          checkInputParameter(method="listFileParentsByLumi", parameters=kwargs.keys(), validParameters=validParameters,
                              requiredParameters=requiredParameters)
          return self.__callServer("fileparentsbylumi", data=kwargs, callmethod='POST')
docs: API to list file parents using lumi section info.
  
          :param block_name: name of block that has files who's parents needs to be found (Required)
          :type block_name: str
          :param logical_file_name: if not all the file parentages under the block needed, this lfn list gives the files that needs to find its parents(optional).
          :type logical_file_name: list of string  
          :returns: List of dictionaries containing following keys [cid,pid]
          :rtype: list of dicts