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The – operator performs set difference, removing 2, resulting in {1, 3}.

clear() removes all items, e.g., {}.clear() results in an empty dictionary.

add(3) inserts 3 into the set, resulting in {1, 2, 3}.

Dictionaries store key-value pairs, e.g., {‘key’: ‘value’}.

Sets automatically remove duplicates, e.g., {1, 2, 2} becomes {1, 2}.

Sets remove duplicates, so len({1, 2, 2, 3}) is 3.

Both dict.get(‘key’) and dict[‘key’] access ‘value’ from the dictionary.

{1, 2, 3} defines a set, using curly braces without colons.

list((1, 2, 3)) converts the tuple to a list, resulting in [1, 2, 3].

remove() deletes the first occurrence of a value, e.g., [1, 2].remove(1) leaves [2].

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