why this will return false?

Hi Yu-che,

As far as I understand the question, it only evaluates if the line

Orange().squeeze()

will return True.

That means, if it will return True, we choose to answer "True" from the quiz options.

And if the line does not return True, "False" being the correct quiz answer, that does not necessarily mean, that the line already returns False, opposing your main question "Why this will return false"

In fact, it does not return False. It returns a NameError (which is a valid condition to select "False" as the answer):

>>> from fruits import Orange
>>> Orange().squeeze()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\fruits.py", line 8, in squeeze
    return has_pulp
NameError: name 'has_pulp' is not defined

# fruits.py
class Fruit:
    has_pulp = False

class Orange(Fruit):
    has_pulp = True

    def squeeze(self):
        return has_pulp

This is because the the squeeze() method which is called by the instance does not know the class variable has_pulp. It only knows the attribute of the instance that called it which is why self.pulp is valid.

Hope this helps.