Python Addition Assignment

Python addition assignment is done with +=, the addition assignment operator.

Example:

>>> x = 3
>>> x += 5
>>> x
8

Read more about the Python addition operation

You can’t add and assign to an undefined variable

>>> d += 3
Traceback (most recent call last):
  File "`<stdin>`", line 1, in `<module>`
NameError: name 'd' is not defined

You can’t add and assign to a literal

>>> 3 += 3
  File "`<stdin>`", line 1
SyntaxError: can't assign to literal

Python doesn’t have a ++ operator, like some other languages, so you will frequently see statements like this instead:

x += 1