Guy - although you are correct in principle, in this exercise we do not require this.
BTW, there is a special method called __radd__ (right addition), which should take care of such a scenario (addition when the class object 'self' is the right operand). Similarly, there are __rsub__, __rmul__, etc. etc.
Again - in this exercise you do not need to implement those.
Once again, we ask you to align your posts appropriately. Put
[[div style="direction:rtl;"]]
before you message and
[[/div]]
after it, in separate lines.