Get first element of a QuerySet

gistfile1.py

def getLastDateModification(self):
    qs = self.themefile_set.order_by('-date_modified')
    # NEVER !!
    return qs[0].date_modified
        
    # The most efficient/failsafe way (this will add LIMIT 1 to the query):
    rs = list(qs[:1])
    return rs and rs[0].date_modified or None