Python · Theory

Python Tuple Methods

Theory

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Python Tuple Methods

Tuples barely have methods because they cannot change. count(x) tells how many times x appears. index(x) tells the first position. That is the whole everyday list. To “change” a tuple you build a new one from pieces: t[:1] + (9,).

Contrast with list: list has append, pop, sort. Tuple does not. If they ask why, say immutability. Don’t invent tuple.append in the viva.

Python Tuple Methods — output — 2 then 3. count how many 2s; index of 3.

Diagram

point = (3, 4)   immutable
     x=3     y=4

Exam tip

Why tuples have fewer methods than lists.

Example

# Tuple methods
t = (1, 2, 2, 3)
print(t.count(2))
print(t.index(3))

Python Tuple Methods — output: 2 then 3. count how many 2s; index of 3.

Short notes

DefCount / index only
RuleNo append
RememberBuild a new tuple to change

Python · Theory

Python Tuple Methods

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Theory

33/268

Python Tuple Methods

Contrast with list: list has append, pop, sort. Tuple does not. If they ask why, say immutability. Don’t invent tuple.append in the viva.

Python Tuple Methods — output — 2 then 3. count how many 2s; index of 3.

Diagram

point = (3, 4)   immutable
     x=3     y=4

Exam tip

Why tuples have fewer methods than lists.

Example

# Tuple methods
t = (1, 2, 2, 3)
print(t.count(2))
print(t.index(3))

Python Tuple Methods — output: 2 then 3. count how many 2s; index of 3.

Short notes

DefCount / index only
RuleNo append
RememberBuild a new tuple to change

Python Tuple Methods

Example

Short notes

Questions

Python Tuple Methods

Example

Short notes

Questions