def build_features(self, player_id, postseason):
f = Features()
df = self.get_player_stats(player_id, postseason)
new_season = self.add_new_season(df)
f.merged = df.append(new_season, sort=False)
f.merged = f.merged[[x for x in f.merged if '_lag' not in x]]
f.merged.drop([f'{x}_{y}' for x in f.aggregates for y in f.stats_columns], axis=1, inplace=True)
f.merged['draft_entry'] = f.merged['draft_entry'].astype(float)
f.get_age_at_season()
f.get_stats_per_game()
f.get_lags()
f.get_aggregates()
return f.merged
