What is the output when we do += in Python?

Question

Hi all. As per the above title, I want some help with the expected output when I go about using the += operation in Python.

All help appreciated.

Answer 1

Hi. So, it is very simple. The += adds another single value to the existing value. So, you can guess what happens later. This values gets added to the variable and it is used. 

Check out the code below:
 

>>> x = 3

>>> x += 2

>>> print x

5

You can have similar operations for subtraction, division and even multiplication.

Hope this helped!

Answer 2

While working with Python x += 5  is not exactly the same as saying x = x + 5. It varies where and in which context you are using it I will show you two examples regarding this:-

Example 1:-

In this example you will see += adds another value with the variable's value and assigns the new value to the variable.

x = 3

x += 2

print(x)

Example 2:-

When we do x+=[] it just merged the elements of the array with the assigned values and make a combined array including those values.

x = [2,3,4]    

y = x    

x += 7,8,9 

print(x)

print(y)