Inheritance

Fatma Kahveci
Coding
Page content
class Bird:

 def __init__(self):
  print("Bird is ready")

 def whoisThis(self):
  print("Bird")

 def swim(self):
  print("Swim faster")

class Penguin(Bird):

 def __init__(self):
  super().__init__()
  print("Penguin is ready")

 def whoisThis(self):
  print("Penguin")

 def run(self):
  print("Run faster")


peggy = Penguin() # Bird is ready # Penguin is ready
peggy.whoisThis() # Penguin
peggy.swim() # Swim faster
peggy.run() # Run faster

  • Childin parenta erisimi var. Ancak once kendisine ait olani kullaniyor.

  • Superclass/Parent Class: Inherit ettigimiz class. i.e. Employee

  • Subclass/Child Class: Inherit edilen class. i.e. IT

  • super() has two major use cases:

    • to avoid using the base class name explicitly
    • working with multiple inheritance
"""The syntax for a derived class definition
class <DerivedClassName>(<BaseClassName>):
  <statement>
  ...
"""

class Employee:
  
  raise_percent = 1.05 # class variable
  num_emp = 0 # kac calisan oldugu bilgisini tutmak icin
  
  def __init__(self, name, last, age, pay):
    self.name = name # instance variable
    self.last = last
    self.age = age
    self.pay = pay
    Employee.num_emp += 1
    
  def apply_raise(self):
    self.pay = self.pay * self.raise_percent

class IT(Employee): # class <subclass>(<superclass>)
  raise_percent = 1.2
  
  def __init__(self, name, last, age, pay, lang):
    super().__init__(name, last, age, pay)
    self.lang = lang

emp_1 = Employee("James", "Hughes", "32", 5000)
emp_2 = Employee("Charlie", "Brown", "22", 3000)

# use Employee's __init__()
it_1 = IT("James", "Hughes", "32", 5000, "python")

# isinstance(<class_name>, <class_name>)
# issubclass(<class_name>, <class_name>)