Question
In this exercise, the peek()
method will return the value of get_value()
for the top_item
. What happens if the Stack
is empty when peek()
is called?
Answer
At this particular stage of the Stack
class implementation, calling peek()
on an empty stack will result in a Python error message: AttributeError: 'NoneType' object has no attribute 'get_value'
. Ideally, the peek()
method should have a check to ensure that the Stack
is not empty before attempting the reference the value of self.top_item
. Later iterations of the Stack
class in this lesson will implement a check.