docs: def tag_counts(self):
          """ Get a list of tags and the number of each.
  
          Returns
          -------
          List of tuples, in order (tag, # of Symbols w/Tag)
          
          """                    
          qry = self.ses.query(SymbolTag.tag, func.count(SymbolTag.tag))
          qry = qry.group_by(SymbolTag.tag)
          qry = qry.order_by(SymbolTag.tag)
          tags = list(qry.all())
          return tags