Increment with __pos__

In Python, there is no increment operation ++ like in C-like languages, so x += 1 is used instead. However, the expression ++x is valid code (but not x++), as it's just two unary addition operators.

When applying a unary plus to an object, the magic method __pos__ is called, so the expression ++x can be understood as x.__pos__().__pos__(). Knowing this, we can implement a class that represents a number and supports increment behavior.

The code in the image might seem a bit complex at first, but it's better to trace the logic and understand how the __pos__ method works. If all other necessary magic methods are implemented, a fully functional number class can be created, but it's better not to use such tricks in production code.