These set operations have fast, optimized implementations. Other set operations use generic implementations that are often slower.

Construct set with specific items:

• {item0, ..., itemN}

Construct empty set:

• set()

Construct set from iterable:

• set(x: Iterable)

Set comprehensions:

• {... for ... in ...}
• {... for ... in ... if ...}

• item in s

• s.add(item)
• s.remove(item)
• s.discard(item)
• s.update(x: Iterable)
• s.clear()
• s.pop()

• len(s: set)