F-String Formatting
Posted 2024-07-16 21:39:15
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F-strings are a powerful and concise way to format strings in Python introduced in Python 3.6. They provide a way to embed expressions directly inside strings using curly braces {}
. This makes code more readable and easier to maintain compared to other formatting methods.
Here's a breakdown of how F-Strings work:
Creating F-Strings:
- An f-string is prefixed with the letter
f
orF
before the opening quotation mark ("
or'
). - Inside the string, you can include expressions within curly braces
{}
. These expressions can be variables, calculations, or function calls.
Example:
Python
name = "Alice"
age = 30
greeting = f"Hello, {name}!" # Embeds the value of 'name' in the string
age_info = f"{name} is {age} years old." # Embeds both 'name' and 'age'
print(greeting)
print(age_info)
Output:
Hello, Alice!
Alice is 30 years old.
Formatting Options:
F-strings also allow for basic formatting of the included expressions. You can specify format specifiers after the colon :
within the curly braces. Here are some common options:
.2f
: Formats numbers as floating-point values with two decimal places.,
: Adds commas for separating thousands (e.g., for large numbers).
Example:
Python
discount = 0.1
sale_price = f"Discounted price: ${(100 - discount * 100):.2f}"
print(sale_price)
Use code with caution.
Output:
Discounted price: $90.00
Advantages of F-Strings:
- Readability: F-strings keep your code clean and easy to understand by integrating variables and expressions directly into the string.
- Conciseness: They eliminate the need for separate string formatting methods like the
.format()
function. - Flexibility: You can include any valid Python expression within the curly braces.
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