Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Please answer the following question in Python code:
- Inheritance (based on 8.38) You MUST use inheritance for this problem. A stack is a sequence container type that, like a queue, supports very restrictive access methods: all insertions and removals are from one end of the stack, typically referred to as the top of the stack. A stack is often referred to as a last-in first-out (LIFO) container because the last item inserted is the first removed. Implement a Stack class using Note that this means you may be able to inherit some of the methods below. Which ones? (Try not writing those and see if it works!)
- Constructor/_init__ - Can construct either an empty stack, or initialized with a list of items, the first item is at the bottom, the last is at the top.
- push() – take an item as input and push it on the top of the stack
- pop() – remove and return the item at the top of the stack
- isEmpty() – returns True if the stack is empty, False otherwise
- [] – return the item at a given location, [0] is at the bottom of the stack
- len() – return length of the stack
The object is to make this client code work:
(below are possible outputs from the code):
'''
>>> s = Stack()
>>> s.push('apple')
>>> s
Stack(['apple'])
>>> s.push('pear')
>>> s.push('kiwi')
>>> s
Stack(['apple', 'pear', 'kiwi'])
>>> top = s.pop()
>>> top
'kiwi'
>>> s
Stack(['apple', 'pear'])
>>> len(s)
2
>>> s.isEmpty()
False
>>> s.pop()
'pear'
>>> s.pop()
'apple'
>>> s.isEmpty()
True
>>> s = Stack(['apple', 'pear', 'kiwi'])
>>> s = Stack(['apple', 'pear', 'kiwi'])
>>> s[0]
'apple'
>>>
'''
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