I don't know python so I can't say what's wrong, but in my case the extracted data is inaccurate. I'll explain: my name appears in both "es.po" and "es_MX.po" (my "es" translation was used as a starting point for "es_MX"), you can see this doing: ----------------------------------------------------------- # grep lucas * es_MX.po:# Lucas Vieites <lucas@...2...>, 2003. es.po:# Lucas Vieites Fariña <lucas@...162...>, 2003-2007, 2008. es.po:"Last-Translator: Lucas Vieites <lucas@...162...>\n" ----------------------------------------------------------- When running the python script the entry that results is the first one from 2003, which is the most inaccurate.