String formatting using f-strings in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the name using an f-string.

Python

name = "Alice"
print(f"Hello, [1]!")

Drag options to blanks, or click blank then click option'

Aname()

B"name"

CName

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around the variable name inside the braces.

Using a function call instead of the variable.

Capitalizing the variable name incorrectly.

The variable name is used inside the f-string without quotes to insert its value.

2fill in blank

medium

Complete the code to format the number with two decimal places using an f-string.

Python

price = 9.8765
print(f"Price: $[1]")

Drag options to blanks, or click blank then click option'

Aprice:.1f

Bprice:.3f

Cprice:.2f

Dprice:.0f

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong number of decimal places.

Forgetting the colon before the format specifier.

Using quotes inside the braces.

The format specifier :.2f rounds the number to two decimal places in the f-string.

3fill in blank

hard

Fix the error in the f-string to correctly display the age variable.

Python

age = 30
print(f"Age: [1] years")

Drag options to blanks, or click blank then click option'

Aage

Bage)

C(age

D"age"

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses inside the braces.

Putting quotes around the variable name.

Leaving unmatched parentheses.

The variable age should be inside the braces without extra characters or quotes.

4fill in blank

hard

Fill both blanks to create an f-string that shows the product name and its price with two decimals.

Python

product = "Book"
price = 12.5
print(f"[1] costs $[2]")

Drag options to blanks, or click blank then click option'

Aproduct

Bprice

Cprice:.2f

D"product"

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around the variable names.

Not formatting the price to two decimals.

Swapping the variables in the blanks.

The first blank uses the variable product to show the name. The second blank uses price:.2f to format the price with two decimals.

5fill in blank

hard

Fill all three blanks to create an f-string that shows the user's name in uppercase, their age, and a message.

Python

user = "emma"
age = 25
print(f"User: [1], Age: [2], Message: [3]")

Drag options to blanks, or click blank then click option'

Auser.upper()

Bage

C"Welcome!"

Duser

Attempts:

3 left

💡 Hint

Common Mistakes

Not calling the upper() method.

Putting the message without quotes.

Using the variable user without upper().

The first blank uses user.upper() to show the name in uppercase. The second blank shows the age variable. The third blank is a string message inside quotes.

Practice

1. What is the main purpose of using f-strings in Python?

easy

A. To easily insert variables or expressions inside strings

B. To create lists from strings

C. To convert strings to uppercase

D. To repeat strings multiple times

Solution

1. Step 1: Understand f-string usage

   F-strings allow embedding variables or expressions inside strings using curly braces {}.

2. Step 2: Compare options

   Only To easily insert variables or expressions inside strings describes this purpose correctly; others describe unrelated string operations.

3. Final Answer:

   To easily insert variables or expressions inside strings -> Option A

4. Quick Check:

   f-strings = insert variables in strings [OK]

Hint: Remember: f-strings embed variables with curly braces {} [OK]

Common Mistakes:

• Confusing f-strings with string methods like upper()
• Thinking f-strings create lists
• Assuming f-strings repeat strings

2. Which of the following is the correct syntax to use an f-string to insert variable name into a string?

easy

A. "Hello, $name!"

B. f"Hello, {name}!"

C. f'Hello, $name!'

D. "Hello, {name}!"

Solution

1. Step 1: Identify f-string syntax

   An f-string starts with the letter f before the quotes and uses curly braces {} to insert variables.

2. Step 2: Check each option

   f"Hello, {name}!" correctly uses f"Hello, {name}!". Options A and B lack the f prefix, and C uses incorrect syntax with $name.

3. Final Answer:

   f"Hello, {name}!" -> Option B

4. Quick Check:

   f-string = f"text {var}" [OK]

Hint: f-string must start with f and use {variable} inside quotes [OK]

Common Mistakes:

• Omitting the f before the string
• Using $ instead of curly braces
• Using single quotes without f prefix

3. What will be the output of this code?

name = "Alice"
age = 30
print(f"{name} is {age} years old.")

medium

A. name is age years old.

B. {name} is {age} years old.

C. SyntaxError

D. Alice is 30 years old.

Solution

1. Step 1: Evaluate variables inside f-string

   The variables name and age are replaced by their values "Alice" and 30 inside the string.

2. Step 2: Understand print output

   The print statement outputs the string with variables replaced: "Alice is 30 years old.".

3. Final Answer:

   Alice is 30 years old. -> Option D

4. Quick Check:

   f-string replaces {name} and {age} with values [OK]

Hint: f-string prints variable values, not variable names [OK]

Common Mistakes:

• Expecting curly braces to print literally
• Confusing variable names with values
• Thinking f-string causes syntax error here

4. Find the error in this code snippet:

age = 25
print(f"Age is {age")

medium

A. Missing closing brace '}' in f-string

B. Missing f before the string

C. Variable age is not defined

D. Incorrect use of quotes

Solution

1. Step 1: Check f-string braces

   The f-string has an opening brace { but no matching closing brace }, causing a syntax error.

2. Step 2: Verify other parts

   The f prefix is present, variable age is defined, and quotes are correct.

3. Final Answer:

   Missing closing brace '}' in f-string -> Option A

4. Quick Check:

   Every { must have a matching } in f-string [OK]

Hint: Count braces in f-string; each { needs a } [OK]

Common Mistakes:

• Forgetting to close curly braces
• Thinking missing f causes this error
• Assuming variable is undefined

5. You want to print the price of an item with 2 decimal places using f-strings. Which code correctly formats the price variable?

price = 9.8765
# Choose the correct print statement

hard

A. print(f"Price: ${price:2f}")

B. print(f"Price: ${price:.2}")

C. print(f"Price: ${price:.2f}")

D. print(f"Price: ${price:.2d}")

Solution

1. Step 1: Understand format specifier for decimals

   To format a float with 2 decimal places, use :.2f inside the curly braces.

2. Step 2: Check each option

   print(f"Price: ${price:.2f}") uses {price:.2f} correctly. print(f"Price: ${price:2f}") misses the dot, print(f"Price: ${price:.2}") misses the type specifier, and print(f"Price: ${price:.2d}") uses invalid d for decimals.

3. Final Answer:

   print(f"Price: ${price:.2f}") -> Option C

4. Quick Check:

   Use :.2f to format float with 2 decimals [OK]

Hint: Use :.2f inside {} to show 2 decimal places [OK]

Common Mistakes:

• Omitting the dot before precision
• Using integer format 'd' for floats
• Leaving out the type specifier