# Example of Object Oriented Programming (OOP) classes and objects.

# First we need to declare the class that will server us as a "template".

class Plane:

def __init__(self, model, seats):

# The init function is the function executed when we first create (instanciate)

# the class in the main programm. When we instanciate a class we have an object.

# In this init we declare the variables that we are going to use for the class.

self.plane_model = model

self.number_seats = seats

# This two functions will return us the value of the object when we call them on the

# main program.

def model(self):

return self.model

def seats(self):

return self.seats

# And with this two functions we can change the values of the class variables.

def change_model(self, model):

self.plane_model = model

def change_seats(self, seats):

self.number_seats = seats

def main():

# To use a class, first we have to create an object of that class (instanciate it).

# And since we defined the init function with two parameters, we have to pass them

# to the class. As you can see here we have an object "boeing" and an "object" cesna,

# both of the class "Plane".

boeing = Plane('Boeing 787', '200')

cesna = Plane('Cesna', '4')

# And now with the objects we can call the other functions we have defined.

print(boeing.model())

print(cesna.seats())

# We can also change the values of the object with the functions we have made.

boeing.change_seats(202)

cesna.change_model('Cesna 070')

if __name__ == "__main__":

main()