def _add_player_to_roster(self, first, last):
roster = read_roster()
if self._has_player(roster, first, last):
return False
row = pd.DataFrame({'First Name': first,
'Last Name': last},index=[0])
for cname in roster.columns[2:]:
row[cname] = 1
roster = roster.append(row, ignore_index=True)
write_roster(roster)
return True