math2001 · September 23, 2018 06:42
diff --git a/oop.py b/oop.py
 # We are going to use an analogy of building houses to understand OOP.

 # A class is like the plan/design of the house. It's the theory, nothing concrete.
 # Our house has different properties (such as the colour, the number of doors, etc), these are called attributes.
 # Our house has different behaviours (such as starting the alarm, locking every doors, etc), these are called methods.

 # An instance, however, is the real thing. From one plan, one design, one *class*, we can make as many actual houses as we like
 # And we can change them. For example, one house (an instance), might have 2 doors, where as an other one might have 4 doors.
 # But they still have the same plan

 # In code

 class House:
  
  def __init__(self):
    # __init__ is a method, but a special one.
    # In Python, it's called a magic method
    # It is run every time you create a new instance.
    print('creating a new house!')
    
    # self is referencing to the instance we are creating. This means that we can set the attributes in here:
    self.number_of_doors = 2
    self.color = 'white'
    
    self.is_locked = False
    
  def lock(self):
    # every method has to take at least one parameter, 'self'. Everytime.
    
    self.is_locked = True
    
  def unlock(self):
    self.is_locked = False
    
  def change_color(self, newcolor):
    self.color = newcolor
    
    
 # Ok, so we have defined what the plan/design of our house was. Let's create some.
 # Here's how:
 # instance = Plan(arguments)
 # In our case:

 myhouse = House()
 yourhouse = House()
 print(myhouse.color) # prints white
 print(yourhouse.color) # prints white
 print(myhouse.is_locked) # prints false
 print(yourhouse.is_locked) # prints false

 myhouse.change_color('red')
 print(myhouse.color) # prints 'red', because we just changed it
 print(yourhouse.color) # prints 'white'! Our 2 houses are INdependent.
	# We are going to use an analogy of building houses to understand OOP.

	# A class is like the plan/design of the house. It's the theory, nothing concrete.
	# Our house has different properties (such as the colour, the number of doors, etc), these are called attributes.
	# Our house has different behaviours (such as starting the alarm, locking every doors, etc), these are called methods.

	# An instance, however, is the real thing. From one plan, one design, one class, we can make as many actual houses as we like
	# And we can change them. For example, one house (an instance), might have 2 doors, where as an other one might have 4 doors.
	# But they still have the same plan

	# In code

	class House:

	def __init__(self):
	# __init__ is a method, but a special one.
	# In Python, it's called a magic method
	# It is run every time you create a new instance.
	print('creating a new house!')

	# self is referencing to the instance we are creating. This means that we can set the attributes in here:
	self.number_of_doors = 2
	self.color = 'white'

	self.is_locked = False

	def lock(self):
	# every method has to take at least one parameter, 'self'. Everytime.

	self.is_locked = True

	def unlock(self):
	self.is_locked = False

	def change_color(self, newcolor):
	self.color = newcolor


	# Ok, so we have defined what the plan/design of our house was. Let's create some.
	# Here's how:
	# instance = Plan(arguments)
	# In our case:

	myhouse = House()
	yourhouse = House()
	print(myhouse.color) # prints white
	print(yourhouse.color) # prints white
	print(myhouse.is_locked) # prints false
	print(yourhouse.is_locked) # prints false

	myhouse.change_color('red')
	print(myhouse.color) # prints 'red', because we just changed it
	print(yourhouse.color) # prints 'white'! Our 2 houses are INdependent.