In Python, you can increment a variable by a certain amount using the += operator. This is a shorthand way of writing x = x + y, where x is the variable you want to increment and y is the amount you want to increment it by.

Here's an example:

x = 5
x += 3  # equivalent to x = x + 3
print(x)  # 8

In this example, we start with the variable x equal to 5. We then use the += operator to increment x by 3, which updates x to be 8.