How to Use Python f-Strings?

 

Basic Usage

Here's a basic example of using f-strings:

name = "Alice"

age = 30

greeting = f"Hello, my name is {name} and I am {age} years old."

print(greeting)

Hello, my name is Alice and I am 30 years old.

Embedding Expressions

You can also embed expressions directly inside f-strings:

length = 5

width = 3

area = f"The area of the rectangle is {length * width} square units."

print(area)

The area of the rectangle is 15 square units.

Formatting Numbers

F-strings also allow you to format numbers:

pi = 3.141592653589793

formatted_pi = f"Pi rounded to two decimal places is {pi:.2f}."

print(formatted_pi)

Pi rounded to two decimal places is 3.14.

Using Functions Inside F-Strings

You can even call functions within an f-string:

def greet(name):

    return f"Hello, {name}!"

message = f"{greet('Alice')}"

print(message)

Hello, Alice!

Multi-line F-Strings

F-strings can also be used with multi-line strings:

name = "Alice"

age = 30

info = (

    f"Name: {name}\n"

    f"Age: {age}\n"

    f"Location: Wonderland"

)

print(info)

Name: Alice

Age: 30

Location: Wonderland

Combining F-Strings with Other String Formatting

F-strings can be combined with other string formatting methods if necessary:

name = "Alice"

age = 30

combined = f"Name: {name}, " + "Age: {}".format(age)

print(combined)

Name: Alice, Age: 30