dividing by list not possible?

[buran]

Isn't this a bit contradictory from a programming point of view?

No, it depends on the implementation for a particular type/object. i.e. the creators of numpy implemented this functionality for numpy array object (that is what np.linspace returns). The python core developers did not implement that functionality for the list. You can use list comprehension instead. Or convert expectation_val_V to numpy array.
Also note that when you multiply a list by int constant, the new list is not constructed by multiplying individual elements of the original list.