String formatting using f-strings in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an f-string in Python?

An f-string is a way to embed expressions inside string literals, using curly braces {} and prefixing the string with the letter 'f'. It makes string formatting easier and more readable.

beginner

How do you include a variable named name inside an f-string?

You write the string with an f before the quotes and put the variable inside curly braces like this: f"Hello, {name}!".

intermediate

How can you format a floating-point number to show only 2 decimal places using f-strings?

Use a format specifier inside the braces like this: f"{value:.2f}". This rounds the number to 2 decimal places.

intermediate

Can you use expressions inside f-strings? Give an example.

Yes! You can put any valid Python expression inside the braces. For example: f"5 + 3 = {5 + 3}" will output 5 + 3 = 8.

advanced

How do you include a literal curly brace character in an f-string?

To include a curly brace, double it: use {{ for { and }} for }. For example: f"{{Hello}}" outputs {Hello}.

What prefix do you add before a string to create an f-string in Python?

A f

B s

C r

D b

The prefix 'f' before the quotes tells Python to treat the string as an f-string.

How would you format the number 3.14159 to show only 2 decimal places using an f-string?

A f"{3.14159:2d}"

B f"{3.14159:.2d}"

C f"{3.14159:.2f}"

D f"{3.14159:2f}"

The format specifier '.2f' rounds the number to 2 decimal places.

What will this code print? <br> name = 'Sam'<br>print(f"Hello, {name}!")

A Hello, {name}!

B Hello, Sam!

C Hello, name!

D Error

The variable 'name' is replaced by its value 'Sam' inside the f-string.

How do you include a literal curly brace '{' in an f-string?

A You cannot include literal braces in f-strings

B Use a backslash before it: \{

C Put it inside quotes: '{'

D Double the brace: {{

Doubling the brace '{{' or '}}' tells Python to include a literal brace.

Can you put calculations inside the curly braces of an f-string?

A Yes, any valid Python expression can be used

B Only string operations are allowed

C Only simple math operations are allowed

D No, only variables are allowed

F-strings can evaluate any valid Python expression inside the braces.

Explain how to use f-strings to include variables and expressions inside strings.

Think about how you write the string and where you put the variable names.

Describe how to format numbers with specific decimal places using f-strings.

Look inside the braces for a colon and formatting code.