code: def addSiInfo(self, msrunContainer, specfiles=None,
                    attributes=['obsMz', 'rt', 'charge']):
          
          if specfiles is None:
              specfiles = [_ for _ in viewkeys(self.info)]
          else:
              specfiles = aux.toList(specfiles)
  
          for specfile in specfiles:
              if specfile not in self.info:
                  warntext = 'Error while calling "SiiContainer.addSiInfo()": '\
                             '"%s" is not present in "SiiContainer.info"!'\
                              % (specfile, )
                  warnings.warn(warntext)
              elif specfile not in msrunContainer.info:
                  warntext = 'Error while calling "SiiContainer.addSiInfo()": '\
                             '"%s" is not present in "MsrunContainer.info"'\
                              % (specfile, )
                  warnings.warn(warntext)
              else:
                  for identifier in self.container[specfile]:
                      si = msrunContainer.sic[specfile][identifier]
                      for sii in self.container[specfile][identifier]:
                          for attribute in attributes:
                              setattr(sii, attribute,
                                      getattr(si, attribute, None)
                                      )
docs: Transfer attributes to :class:`Sii` elements from the corresponding
          :class`Si` in :class:`MsrunContainer.sic <MsrunContainer>`. If an
          attribute is not present in the ``Si`` the attribute value in the
          ``Sii``is set to ``None``.
  
          Attribute examples: 'obsMz', 'rt', 'charge', 'tic', 'iit', 'ms1Id'
  
          :param msrunContainer: an instance of :class:`MsrunContainer` which has
              imported the corresponding specfiles
          :param specfiles: the name of an ms-run file or a list of names. If None
              all specfiles are selected.
          :param attributes: a list of ``Si`` attributes that should be
              transfered.