← Python

Enumerations – Basics

An Enum class defines a fixed set of named constants that each have a name and a value

What it does: Tuples are ordered, immutable sequences defined with parentheses. Tuple unpacking assigns each value to a variable in order. Tuples are like lists but cannot be changed after creation. The comma makes it a tuple — (1,) is a tuple, (1) is just parentheses around 1. Immutable means once created, the items cannot be added, removed, or changed. Indexing a tuple returns the item at that position — t[0] is the first item, 1. Immutability signals intent — use a tuple when the data is fixed (coordinates, RGB values). len() counts the number of items — there are 3 items in this tuple.

Common mistakes: Tuples are immutable: can't change items. Create a new tuple instead. Tuples don't have append(): they're immutable.

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Learning

Duo

What is a tuple?

An immutable ordered sequenceA mutable list

Matches

❌ t = (1)

↓

Error: Single item needs trailing comma: (1,)

Applying

Meanings

Term

Tuple

Meaning

An immutable ordered sequence created with parentheses.

Practice

point = (3, 4)

Testing

Gaps

print(point[])

Check Answer

Spots

1t = (1, 2, 3)

2t[0] = 99

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Quick Questions

1. What is a tuple?

A. An immutable ordered sequence ✓

B. A mutable list

Tuples are like lists but cannot be changed after creation

2. How do you create a tuple?

A. Square brackets []

B. Parentheses () or commas ✓

The comma makes it a tuple — (1,) is a tuple, (1) is just parentheses around 1

3. Can you change a tuple's items?

A. No tuples are immutable ✓

B. Yes

Immutable means once created, the items cannot be added, removed, or changed

4. t = (1, 2, 3)\nt[0] returns?

A. (1)

B. 1 ✓

Indexing a tuple returns the item at that position — t[0] is the first item, 1

5. How do you create a single-item tuple?

A. (1,) with a trailing comma ✓

B. (1)

(1) is just 1 in brackets — the trailing comma is what makes it a tuple

Match the Pairs

t = (1) → Error: Single item needs trailing comma: (1,)

t[0] = 5 → Error: Tuples are immutable — cannot assign

t = (1, 2, 3) → Valid: Tuple with three items

a, b = (10, 20) → Ok: Unpack a tuple into two variables

(1, 2, 3)[1] → Output: 2

len((4, 5, 6, 7)) → Output: 4

Key Term

Tuple

An immutable ordered sequence created with parentheses.~~Immutable

Fill in the Blanks

1. point = (3, 4) print(point[0])

2. single = (42,) # single-item tuple

3. a, b = (10, 20) print(b)

4. t = (1, 2, 3) print(len(t))

5. print(2 in (1, 2, 3))

Spot the Error

Question 1

A t = (1, 2, 3)

B t[0] = 99

C print('Updated:', t)

D print('Done')

Line B — Tuples are immutable: can't change items. Create a new tuple instead.

Question 2

A t = (1, 2, 3)

B t.append(4)

C print('Tuple:', t)

D print('Done')

Line B — Tuples don't have append(): they're immutable

Question 3

A single = (42)

B print('Type:', type(single))

C print('Value:', single)

D # expects tuple

Line A — (42) is just the number 42. Need trailing comma: (42,) for a tuple.

Question 4

A coords = (1, 2, 3)

B a, b = coords

C print('a:', a, 'b:', b)

D print('Done')

Line B — 3 values but only 2 variables: need matching count for unpacking

Question 5

A t = (1, 2, 3)

B first = t(0)

C print('First:', first)

D print('Done')

Line B — Use square brackets for indexing: t[0] not t(0)

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