Python Program to demonstrate the string interpolation

In Python, we can demonstrate string interpolation using f-strings, the % operator, and the format() method. String interpolation is the process of inserting dynamic data or variables into a string, making it useful for creating formatted strings without manual concatenation.

Method 1: Using f-strings

An f-string is a string literal that starts with f or F. The prefix indicates that the string contains expressions enclosed in curly braces {}, which are evaluated at runtime.

Example

Here we create variables and use an f-string to interpolate their values into a formatted message ?

name = 'John'
age = 25
height = 1.75

message = f"My name is {name}. I am {age} years old and {height} meters tall."
print(message)

The output of the above code is ?

My name is John. I am 25 years old and 1.75 meters tall.

Method 2: Using the format() Method

The format() method uses placeholders represented by curly braces {} in the string. Values are passed as arguments to the format() method.

Example

We create a string with placeholders and use format() to specify the values ?

name = 'John'
age = 25
height = 1.75

message = "My name is {}. I am {} years old and {} meters tall.".format(name, age, height)
print(message)

The output of the above code is ?

My name is John. I am 25 years old and 1.75 meters tall.

Method 3: Using the % Operator

The % operator works similar to printf() in C programming. It uses format specifiers like %s (string), %d (integer), and %f (float) to specify the data type of each placeholder.

Example

We use format specifiers and pass values as a tuple to the % operator ?

name = 'John'
age = 25
height = 1.75

message = "My name is %s. I am %d years old and %.2f meters tall." % (name, age, height)
print(message)

The output of the above code is ?

My name is John. I am 25 years old and 1.75 meters tall.

Comparison of Methods

Conclusion

String interpolation in Python can be achieved using f-strings, format(), or the % operator. F-strings are the preferred method for Python 3.6+ due to their readability and performance. Choose the method that best fits your Python version and formatting requirements.