データ

numbers = [['1', '40'], ['4', '13'], ['3', '14'], ['25', '30'], ['17', '20'], ['21', '22']]

リストの要素をキーとして最大値のリストを取得

m = max(numbers, key=lambda x: int(x[0]))
print(m)

実行結果

['25', '30']

m = max(numbers, key=lambda x: int(x[1]))
print(m)

実行結果

['1', '40']

リストの要素をキーとして昇順に並び替える

s = sorted(numbers, key=lambda x: int(x[0]))
print(s)

実行結果

[['1', '40'], ['3', '14'], ['4', '13'], ['17', '20'], ['21', '22'], ['25', '30']]

s = sorted(numbers, key=lambda x: int(x[0]))
print(s)

実行結果

[['4', '13'], ['3', '14'], ['17', '20'], ['21', '22'], ['25', '30'], ['1', '40']]

f = list(filter(lambda x: int(x[0]) % 2 == 0, numbers))
print(f)

実行結果

[['4', '13']]

f = list(filter(lambda x: int(x[1]) % 2 == 0, numbers))
print(f)

実行結果

[['1', '40'], ['3', '14'], ['25', '30'], ['17', '20'], ['21', '22']]

こんなことも一応はできる

f = sorted(list(filter(lambda x: int(x[1]) % 2 == 0, numbers)), key=lambda x: int(x[1]))
print(f)

実行結果

[['3', '14'], ['17', '20'], ['21', '22'], ['25', '30'], ['1', '40']]