String formatting using f-strings in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of f-string with expressions

What is the output of this Python code?

Python

name = "Alice"
age = 30
print(f"{name} will be {age + 5} years old in 5 years.")

A Alice will be 35 years old in 5 years.

B Alice will be age + 5 years old in 5 years.

C Alice will be 30 + 5 years old in 5 years.

D SyntaxError

💡 Hint

Remember that expressions inside curly braces in f-strings are evaluated.

The expression {age + 5} calculates 30 + 5 = 35, so the output is 'Alice will be 35 years old in 5 years.'

❓ Predict Output

intermediate

Formatting numbers with f-strings

What is the output of this code?

Python

value = 3.14159
print(f"Value rounded to 2 decimals: {value:.2f}")

A Value rounded to 2 decimals: 3.14159

B Value rounded to 2 decimals: 3.14

C Value rounded to 2 decimals: 3.1

D Value rounded to 2 decimals: 3.15

💡 Hint

The format specifier .2f rounds the float to 2 decimal places.

The format specifier .2f rounds the number 3.14159 to 3.14 in the output.

❓ Predict Output

advanced

Using f-string with dictionary values

What will this code print?

Python

person = {"name": "Bob", "age": 25}
print(f"{person['name']} is {person['age']} years old.")

A Bob is 25 years old.

B {person['name']} is {person['age']} years old.

C SyntaxError

D Bob is person['age'] years old.

💡 Hint

You can use dictionary keys inside the curly braces in f-strings.

The f-string evaluates person['name'] as 'Bob' and person['age'] as 25, so it prints 'Bob is 25 years old.'

❓ Predict Output

advanced

Nested f-string expressions

What is the output of this code?

Python

x = 4
print(f"Square of {x} is {x**2} and cube is {x**3}.")

A Square of 4 is 8 and cube is 12.

B Square of x is x**2 and cube is x**3.

C SyntaxError

D Square of 4 is 16 and cube is 64.

💡 Hint

Expressions inside curly braces are evaluated before printing.

x**2 is 16 and x**3 is 64, so the output is 'Square of 4 is 16 and cube is 64.'

❓ Predict Output

expert

Using f-string with alignment and padding

What is the output of this code?

Python

for i in range(1,4):
    print(f"Number: {i:>3}")

A

Number:1
Number:2
Number:3

B

Number: 1
Number: 2
Number: 3

C

Number:  1
Number:  2
Number:  3

D SyntaxError

💡 Hint

The >3 means right-align the number in a space of width 3.

Each number is printed right-aligned in a field 3 characters wide, so there are spaces before the number.