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397Set literal `{}`
398Creating a set
399Empty set
400Sets contain unique values
401Set elements must be hashable
402Sets are unordered
403Adding with `.add()`
404Adding many with `.update()`
405Removing with `.remove()`
406Removing with `.discard()`
407`.pop()` on sets
408`.clear()`
409Length and membership
410Union `|`
411Intersection `&`
412Difference `-`
413Symmetric difference `^`
414`.union()` method form
415`.intersection()` method form
416Subset and superset
417Proper subset
418Disjoint sets
419`frozenset()`
420Frozensets as dict keys
421Set comprehensions
422Deduplication idiom
423Fast membership tests

397Set literal `{}`
398Creating a set
399Empty set
400Sets contain unique values
401Set elements must be hashable
402Sets are unordered
403Adding with `.add()`
404Adding many with `.update()`
405Removing with `.remove()`
406Removing with `.discard()`
407`.pop()` on sets
408`.clear()`
409Length and membership
410Union `|`
411Intersection `&`
412Difference `-`
413Symmetric difference `^`
414`.union()` method form
415`.intersection()` method form
416Subset and superset
417Proper subset
418Disjoint sets
419`frozenset()`
420Frozensets as dict keys
421Set comprehensions
422Deduplication idiom
423Fast membership tests

Lesson 402 of 1,289·10. SetsPro lesson

Sets are unordered

Why iteration order is not guaranteed.

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