Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Basics (2015) Python Data Types Strings

Wendy Chang
Wendy Chang
351 Points
Posted by Wendy Chang
Wendy Chang
351 Points

+= in python

Can someone explain more about how += works? I am a bit confused.

1 Answer

Stuart Wright
Stuart Wright
41,120 Points
Stuart Wright
Stuart Wright
41,120 Points

+= is just shorthand for adding something to an existing variable. For example:

x = "Hello"
y = "World"
x += y  # equivalent to x = x + y
# new value of x: "HelloWorld"

a = 4
b = 3
a += b  # equivalent to a = a + b
# new value of a: 7