def format_timestamp(row):
row['<STR_LIT>'] = parse_datetime(row['<STR_LIT>']).isoformat() + '<STR_LIT>'<EOL>return row<EOL>
>>> format_timestamp({'_timestamp': '2012-12-12 00:00'})
{u'_timestamp': u'2012-12-12T00:00:00Z'}