← Python

Type Conversion

int(), float(), and str() convert a value from one type to another

What it does: The f prefix and curly braces embed the variable value into the string. You can put expressions inside {} and Python evaluates them. {name} is replaced by the value stored in name. The {} placeholder is replaced by the variable's value. f before the quote means 'format string' — f"...". {city} is replaced by the value 'Melbourne'. Only the characters you write and the variable's value appear — no extra spaces. {score} is replaced by 100.

Common mistakes: Line 2 is missing f. Should be: message = f"Hello {name}". Line 2 is missing curly braces. Should be: f"I am {age} years old".

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Learning

Duo

After name = "Alice", what is f"Hi {name}"?

Hi AliceHi {name}

Matches

❌ name = 'Bob' print('Hi {name}')

↓

Error: Missing f prefix

Applying

Meanings

Term

name = "Alice"

Meaning

Assigns the string Alice to the variable name.

Practice

name = "Alice"

Testing

Gaps

greeting = "Hello {name}"

Check Answer

Spots

1name = "Alice"

2message = "Hello {name}"

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Quick Questions

1. After name = "Alice", what is f"Hi {name}"?

A. Hi Alice ✓

B. Hi {name}

{name} is replaced by the value stored in name

2. After age = 15, what is f"I am {age}"?

A. I am {age}

B. I am 15 ✓

The {} placeholder is replaced by the variable's value

3. What letter starts an f-string?

A. f ✓

B. s

f before the quote means 'format string' — f"..."

4. Where do variables go in f-strings?

A. After +

B. Inside {} ✓

Curly braces {} mark where a variable value will be inserted

5. After city = "Melbourne", what is f"Welcome to {city}"?

A. Welcome to Melbourne ✓

B. Welcome to {city}

{city} is replaced by the value 'Melbourne'

Match the Pairs

name = 'Bob' print('Hi {name}') → Error: Missing f prefix

age = 10 f'Age: {age'} → Invalid: Unclosed brace

x = 5 f'Value: {x}' → Valid: f-string syntax

f'{2 + 2}' → Ok: Expressions inside {}

name = 'Ali' print(f'Hi {name}!') → Output: Hi Ali!

n = 7 print(f'{n} * 2 = {n*2}') → Output: 7 * 2 = 14

Key Term

name = "Alice"

Assigns the string Alice to the variable name.~~f"Hello {name}"

Fill in the Blanks

1. greeting = f"Hello {name}"

2. age = 12 message = f"I am {age} years old"

3. city = "Sydney" text = f"Welcome to {city}"

4. score = 85 result = f"Your score: {score}"

5. first = "Jo" last = "Li" full = f"{first} {last}"

Spot the Error

Question 1

A name = "Alice"

B message = "Hello {name}"

C print(message)

Line B — Line 2 is missing f. Should be: message = f"Hello {name}"

Question 2

A age = 15

B info = f"I am age years old"

C print(info)

Line B — Line 2 is missing curly braces. Should be: f"I am {age} years old"

Question 3

A city = "Melbourne"

B text = f"Welcome to [city]"

C print(text)

Line B — Line 2 uses [ ] instead of { }. Should be: f"Welcome to {city}"

Question 4

A first = "Bob"

B last = "Smith"

C name = f"{first} {last}"

D greeting = f"Hello (name)"

E print(greeting)

Line D — Line 4 uses (name) instead of {name}. Should be: f"Hello {name}"

Question 5

A score = 100

B message = f"Score: {score}"

C age = 15

D info = "Age: {age}"

E print(info)

Line D — Line 4 is missing f. Should be: info = f"Age: {age}"

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