f-string
- Python course
- Beginner
- Lesson 30/116
- 4 min
Learn to embed variables in text with f"...".
f-string
An f-string is the modern way to embed variables or expressions inside a string. Put an f before the string and write variables inside {}:
name = "Alex"
print(f"Hello {name}") # Hello Alexf-strings were added in Python 3.6 and are the most common method today. You can also write expressions in the braces: f"Total: {3 + 5}".
f-string formatting
You can also format inside an f-string. After : you specify the format:
price = 19.99
print(f"Price: {price:.2f}") # Price: 19.99
print(f"Percent: {0.85:.0%}") # Percent: 85%:.2f gives two decimals, :.0% gives a percentage. This is very handy for tables and reports.
Practice Print an f-string
Assign name = "Alex" and age = 25. Print print(f"{name} is {age}").
Starter code
# Write the f-stringSample solution
name = "Alex"
age = 25
print(f"{name} is {age}")Expected output
Alex is 25
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What does f"Result: {2 + 3}" print?
- Result: 5 Correct answer
- Result: 2 + 3
- Result: {5}
- It raises an error
Explanation: The f-string evaluates the expression in the braces: 5.
2 Complete the f-string
name = "Alex"
print(f"Hello ____")name = "Alex"
print(f"Hello {name}")Explanation: {name} embeds the variable in the f-string.
3 Match the f-string concepts
| Term | Meaning |
|---|---|
f" |
f-string prefix |
{} |
Embedding a variable |
:.2f |
Two decimals |
f"{x}" |
String with variable |