Obejct oriented

in Magic method there is an example given
but they directly write

C1=Car(‘a’,2)
c2=car=(‘b’,2)
c1+c2

but while creating an object we need to call that method
i mean it should be like
c1.add(‘a’,2)
c2.add(‘b’,2)
this is the way we use to do in eariler example
why they directly add them