Set

• Store an unordered collection of unique items.
  • Default is mutable.
  • frozenset is immutable.

    frozenset({1, 2, 3})
    frozenset([4, 5, 6])
    

• Creating an empty set is set().

Dictionary

• Stores key-value pairs.
• Creating an empty dictionary is {}.
• Requesting a value from a dictionary using a key which is not indexed causes python to raise a KeyError exception.

Tuples and Lists

• Store an ordered collection of items.
  • Tuple: immutable
  • List: mutable
• When you try to access an index that is out of bounds of a list or a tuple, Python raises an exception called IndexError.