Python · Theory

Python Set Methods

Theory

36/268

Python Set Methods

Set methods add, remove, or do set algebra. add(x) inserts one. update(...) adds many. remove(x) errors if x is missing. discard(x) stays quiet. pop() removes an arbitrary item. union / intersection / difference / symmetric_difference match | & - ^ . issubset / issuperset / isdisjoint test relationships.

MCQ — remove vs discard. remove(99) on a set without 99 → KeyError. discard(99) does nothing. Say that pair first.

Python Set Methods — output — {1, 2, 3}. discard(9) does nothing — no crash.

Diagram

{1, 2, 2, 3}
         │ unique
         ▼
      {1, 2, 3}

Exam tip

remove raises; discard stays quiet.

Example

# Set methods
s = {1, 2}
s.add(3)
s.discard(9)
print(s)

Python Set Methods — output: {1, 2, 3}. discard(9) does nothing — no crash.

Short notes

DefAdd / update
RuleRemove vs discard
RememberUnion / intersection

Python · Theory

Python Set Methods

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Theory

36/268

Python Set Methods

MCQ — remove vs discard. remove(99) on a set without 99 → KeyError. discard(99) does nothing. Say that pair first.

Python Set Methods — output — {1, 2, 3}. discard(9) does nothing — no crash.

Diagram

{1, 2, 2, 3}
         │ unique
         ▼
      {1, 2, 3}

Exam tip

remove raises; discard stays quiet.

Example

# Set methods
s = {1, 2}
s.add(3)
s.discard(9)
print(s)

Python Set Methods — output: {1, 2, 3}. discard(9) does nothing — no crash.

Short notes

DefAdd / update
RuleRemove vs discard
RememberUnion / intersection

Python Set Methods

Example

Short notes

Questions

Python Set Methods

Example

Short notes

Questions