Можно определить его непосредственно следующим образом:
>>> collection = [[1, 2], ['hexlet']]
# А теперь получим второй элемент первого подмассива
>>> collection[0][1]
2
# Первый элемент второго подмассива
>>> collection[1][0]
'hexlet'
Стоит сказать, что наш массив это по факту список, в который вложены два других списка.
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