What’s the difference between () vs [] vs {}?

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() – tuple

A tuple is a sequence of items that can’t be changed (immutable).

[] – list

A list is a sequence of items that can be changed (mutable).

{} – dictionary or set

A dictionary is a list of key-value pairs, with unique keys (mutable). From Python 2.7/3.1, {} can also represent a set of unique values (mutable).

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