In Python, f'
is used to create formatted strings, also known as f-strings or formatted string literals. It is a concise and convenient way to embed expressions inside string literals, allowing you to interpolate variables and expressions directly into the string.
To define an f-string, you prefix the string with the letter “f” or “F” and enclose the expressions to be interpolated within curly braces {}
. Here’s a simple example:
name = "Alice"
age = 25
greeting = f"Hello, {name}! You are {age} years old."
print(greeting)
Code language: Python (python)
Output:
Hello, Alice! You are 25 years old.
Code language: Python (python)
In this example, the variables name
and age
are enclosed within curly braces inside the f-string. When the string is evaluated, the values of the variables are inserted into the string at their respective positions.
F-strings can also include expressions and function calls. For example:
a = 10
b = 5
result = f"The sum of {a} and {b} is {a + b}."
print(result)
Code language: Python (python)
Output:
The sum of 10 and 5 is 15.
Code language: Python (python)
In this case, the expression a + b
is evaluated and its result is included in the f-string.
F-strings offer a convenient and readable way to create formatted strings in Python, making it easier to compose complex output messages by combining variables and expressions directly within the string itself.
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