code: def _actually_populate_keyvals(filename):
          
          assert isinstance(filename, str)
          keyvals = {}
          with open(filename, 'r') as f:
              for line in f:
                  line = line.strip("\r\n")
                  pieces = line.split(_KeyValuePersister._delimiter)
                  if len(pieces) >= 2:
                      key = pieces[0]
                      val = _KeyValuePersister._delimiter.join(pieces[1:])
                      keyvals[key] = val
          return keyvals
docs: Return a dictionary containing the key/values read from filename.
  
          Raises IOError if the file does not exit etcetera.