def top_n_countries(world_confirmed, feature='Confirmed', n=10):
    """Return list of top n countries with highest feature (Confirmed, Deaths, Recovered, Daily ...)"""
    top_n = (world_confirmed
             .groupby('Country/Region')
             .agg('max')
             .sort_values(feature, ascending=False)
             .head(n)
             .index
             .values)
    return list(top_n)