Python 2.7 Tutorial Pt 7

In this video, I will explain the basics of Object Oriented Programming with Python. Understand that a Class is the blue print that defines what Attributes (variables) and Methods (functions), each object it builds must have.

Each Object that is created is said to be an Instance of the Class that built it. I’ll also go over what Encapsulation is.  Encapsulation is how you hide information  and constrain a user of your class to use it in the way you define. And, finally I teach you how to enforce Encapsulation by making your Attributes and Methods private.

Like always, a lot of code follows the video. If you have any questions or comments leave them below. And, if you missed my other Python Tutorials they are available here:

• Python 2.7 Tutorial Pt 1 : Importing Modules and variable types
• Python 2.7 Tutorial Pt 2: Python Lists & Tuples
• Python 2.7 Tutorial Pt 3: The Print Function & Dictionaries
• Python 2.7 Tutorial Pt 4: The IF Statement & Conditional Expression
• Python 2.7 Tutorial Pt 5: Looping with While and For
• Python 2.7 Tutorial Pt 6: Python Functions

Code From the Video

#! /usr/bin/python

class Animal:

__hungry = “Yes”
__name = “No Name”
__owner = “No Owner”

def __init__(self):
pass

def set_owner(self, newOwner):
self.__owner = newOwner
return

def get_owner(self):
return self.__owner

def set_name(self, newName):
self.__owner = newName
return

def get_name(self):
return self.__name

def noise(self):
print(‘errr’)
self.__hiddenmethod()
return

def __hiddenmethod(self):
print (“Hard to find”)
return

def main():
dog = Animal()

dog.set_owner(‘Sue’)
print dog.get_owner()

dog.noise()

if __name__ == ‘__main__’: main()

Additional Code on this Subject

class Animal:

hungary = “Yes”
__furry = “Yes”
__name = “No Name”
__owner = “No Owner”

def __init__(self): # The constructor function called when object is created
__name = “No Name”
__owner = “No Owner”

# There is a function called a destructor __del__, but its best to avoid it

def set_owner(self, newOwner): # Accessor Method
self.__owner = newOwner
return

def get_owner(self):
return self.__owner

def set_name(self, newName): # Accessor Method
self.__name = newName
return

def get_name(self):
return self.__name

def noise(self): # self is a reference to the object
print(‘errr’) # You use self so you can access attributes of the object
return

def move(self):
print(‘The animal moves forward’)
# print Animal.__hiddenMethod(self) A Private method
return

def eat(self):
print(‘Crunch, crunch’)
return

def furr(self):
print self.__furry

def main():
dog = Animal()

dog.set_owner(‘Sue’)
dog.set_name(‘Jake’)

print dog.get_owner()
print dog.get_name()

if dog.hungary:
dog.eat()
else:
dog.move()

dog.noise()
dog.furr()

if __name__ == ‘__main__’: main()