ref: f-strings in Python
ref: Python's F-String for String Interpolation and Formatting
F-strings, also known as formatted string literals, are a feature introduced in Python 3.6 that provide a concise and convenient way to embed expressions inside string literals. F-strings are often used for string interpolation, making it easy to insert variables and expressions into strings. They are created by prefixing a string with the letter 'f' or 'F' and enclosing expressions in curly braces {}.
Here's a basic example of how to use f-strings in Python:
name = "Alice"
age = 30
# Create an f-string
greeting = f"Hello, my name is {name} and I am {age} years old."
print(greeting)In this example, the f-string greeting contains placeholders {name} and {age}. When the f-string is evaluated and printed, these placeholders are replaced with the values of the corresponding variables, resulting in the final string "Hello, my name is Alice and I am 30 years old."
F-strings offer several advantages:
-
Readability: F-strings make the code more readable and concise, as you can embed variables directly within the string, making it clear what's being inserted.
-
Expressions: You can include expressions, not just variables, within the curly braces. This allows you to perform calculations or format values directly within the string.
num1 = 10 num2 = 20 result = f"The sum of {num1} and {num2} is {num1 + num2}." -
Formatting: F-strings support various formatting options for numbers, dates, and other data types. For example, you can format floating-point numbers to a specific decimal place or dates in a particular format.
price = 49.99 formatted_price = f"The price is ${price:.2f}" -
Multiline Strings: F-strings can also be used for multiline strings, making it easy to create formatted text with line breaks and indentation.
message = f"""Dear {name}, Thank you for your order. Sincerely, Your Company"""
Keep in mind that f-strings are available in Python 3.6 and later versions. They are a powerful tool for string formatting and are widely used in modern Python code for their readability and flexibility.