Dictionary and Set Comprehensions

Build dicts and sets in one expression, like list comprehensions.

Easy

squares = {n: n * n for n in range(5)}         # {0: 0, 1: 1, 2: 4, …}
unique_lengths = {len(w) for w in words}        # a set
inverted = {v: k for k, v in pins.items()}      # swap keys and values

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