itemgetter

itemgetter.py

from operator import itemgetter
from functools import reduce

leagues = [
    {
        'country': 'Switzerland',
        'teams': ['Young Boys', 'Basel', 'Zürich', 'Grasshoppers', 'St. Gallen', 'Lausanne Sports', 'Thun', 'Luzerns',
                  'Lugano', 'Sion']
    },
    {
        'country': 'Scotland',
        'teams': ['Celtic', 'Rangers', 'Aberdeen', 'Hibernian', 'Motherwell', 'Hearts', 'St. Johnstone', 'Kilmarnock',
                  'Hamilton', 'Dundee FC', 'Ross County', 'Partick Thistle']
    },
    {
        'country': 'Norway',
        'teams': ['Rosenborg', 'Brann', 'Odds BK', 'Haugesund', 'Molde', 'Sarpsborg 08', 'Stromsgodset', 'Viking',
                  'Aalesund', 'Valerenga', 'Sogndal', 'Lilleström', 'Tromsö', 'Stabaek', 'Bodo / Glimt', 'Start']
    }
]

max_team_of_country = max(leagues, key=lambda x: len(x['teams']))
print(f"Country: {max_team_of_country['country']}")

min_team_of_country = min(leagues, key=lambda x: len(x['teams']))
print(f"Country: {min_team_of_country['country']}")

country = itemgetter('country')
order_by_name_of_country = sorted(leagues, key=country)
print(f"Order: {order_by_name_of_country}")

country_order = list(map(country, order_by_name_of_country))
print(f"Order: {country_order}")

lists_of_list_of_teams = list(map(lambda league: league['teams'], leagues))
print(f"Lists of list of teams: {lists_of_list_of_teams}")

list_of_teams = sorted(reduce(lambda x, y: x + y, lists_of_list_of_teams))
print(f"List of teams: {list_of_teams}")

sort_by_number_of_teams = sorted(leagues, key=lambda x: len(x['teams']), reverse=True)
print(f"Sorted by number of teams: {sort_by_number_of_teams}")