In this exercise, the
__add__() method is implemented for the
Atom class but returns a
Molecule class. Does
__add__() always need to return a different class?
__add__() method can be implemented to return whatever type or class makes sense for the operation. For this exercise, the addition of two
Atom objects returns a
Molecule. In some other case, a class may just return a new instance of the same class. The
__add__() method is free to return whatever makes sense for the operation being performed.