Lesson 9 hw, Python 3

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# Object Oriented Programming - Data Structure Stack

'''
    Stack - LIFO (Last In First Out)
    
    1. Extracting book 4
    Book 1 --->>
    Book 2 --->>
    Book 3 --->>
    Book 4           Book 4
    Book 5           Book 5
    Book 6           Book 6
    
    
    2. Removing from pile of books (always the thing on top) (Popping)
    
    Book 4 --->>
    Book 3
    Book 2
    Book 1

3. Adding Book 5 to the pile (always on the top) (Pushing)

Book 5
    Book 4
    Book 3
    Book 2
    Book 1

'''
class Stack:
    def __init__(self):
        self.items = []   # empty list
        
    def push(self, add_an_item):
        return self.items.append(add_an_item)
    
    def pop(self):
        if self.isEmpty() is True:
            return []
        else:  # stack not empty
            return self.items.pop()
    
    def show(self):
        print (self.items[:])
    
    def isEmpty(self):
        if self.items == []:
            return True
        else:
            return False
    
    def size(self):
        return len(self.items)

''' Homework
1. Study thoroughly Stack class
2. Write an OOP for medical employees
    a. Doctor, Nurse
    b. Salaries for them
    c. Working hours for each of them
    d. Total number of employees working in the hospital

'''

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