What Is += In Python

You may have come across the += operator in Python, but what exactly does it do? And what is its purpose? In this article, we’ll explore the functionality of the += operator and how it can be useful in your Python programming journey.

Understanding the += Operator

The += operator in Python allows you to add two values together and then assign the resulting value to a variable. This operation is commonly referred to as the “addition assignment operator.” It is particularly helpful when you need to add two values and apply the result to a variable.

To use the += operator, you simply write “variable_name += value.” The value can be either a number or a Python string. If it is a number, the two values will be added together. If it is a string, the value will be appended to the existing string value of the variable.

Exploring Examples

Let’s take a look at a couple of examples to better understand how the += operator works.

Example 1: Adding Numbers

Suppose you want to keep a running total of numbers in Python. You can achieve this using the += operator. Let’s say you start with the variable a having a value of 10. To update a with the addition of 7.5, you would write:

a = 10
a += 7.5

The output will be 17.5. As you can see, the += operator simplifies the process of adding values to a variable and updating its value.

Example 2: Appending Strings

Let’s say you have a string variable message with the value “Hello.” If you want to add the string ” World” to it using the += operator, you would write:

message = "Hello"
message += " World"

The output will be “Hello World.” Here, the += operator appends the string ” World” to the existing value of the message variable.


In conclusion, the += operator in Python is a useful tool for performing mathematical operations and updating variable values in a concise manner. It simplifies the process of adding values to variables, whether they are numbers or strings. By understanding and utilizing the += operator, you can streamline your Python programming and save time on manual calculations. So, embrace the power of the += operator and make your Python code more efficient.

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