Class(part2)

lets make an stack...

a Simple Example

lets make a class

what is stack ?

TIP: The initial step to make a class is defining its API (what is API?)

API

function/variable	arguments	returns	description
push	value:[anytype]	None	pushes value into stack
pop	-	last item in the stack, None if stack is empty	removes the last item in the stack and returns it
lastItem	-	last item in the stack	like pop but without removing
isEmpty	-	True or False	returns True if stack is empty
size	-	int	returns the number of items stored in the stack
str	-	?	?
eq	other stack	?	?

Question

1. Implement a stack class
2. describe how to use it in other code

How to force user not to have access to main data in class?

public, private and protected Access Modifiers

Question
define terms public, private and protected.

class test:
  """docstring for test."""

  def __init__(self):
    self.public='public' # this is public
    self._protected="protected" # this is protected
    self.__private="private" # this is private

NOTE: that was all joke!!! :)