def get_wildcards(df_sim, df_div_winners, n_wc):
    """Calculate wildcards per simulation

  :param df_sim: simulated data
  :param df_div_winners: data frame with div winners in each iteration
  :param n_wc: number of wildcard positions open
  :return: data frame with wildcard teams per iteration
  """
    return df_sim.merge(df_div_winners[['team_id', 'iteration']], on=[
        'team_id', 'iteration'], how='left', indicator=True).query(
        '_merge=="left_only"').drop('_merge', 1).sort_values(by=['tot_wins',
        'tot_pts'], ascending=[False, False]).groupby('iteration').head(n_wc
        ).sort_values(by='iteration').reset_index(drop=True)
