Get and Set

Getter and setter are methods for non-direct access to the attributes:

get() ( getter ) returns the value of the private attribute;
set() ( setter ) sets the value.

These methods are called properties.

You can implement them by defining two additional methods:

class Cat:

def __init__(self, name = 'Kitty', age = 1):

self.name = name

self.__age = age

self.__children = 0

# Getter

def get_age(self):

return self.__age

# Setter

def set_age(self, age):

if isinstance(age, int) and 0 <= age <= 30:

self.__age = age

else:

print('Invalid value of attribute age')

cat = Cat('Maggie', 3)

# Wrong value

cat.set_age(-23)

cat.set_age(8)

print(cat.get_age())


              12345678910111213141516171819202122
            
class Cat:
  def __init__(self, name = 'Kitty', age = 1):
    self.name = name
    self.__age = age
    self.__children = 0 

  # Getter
  def get_age(self):
    return self.__age

  # Setter
  def set_age(self, age):
    if isinstance(age, int) and 0 <= age <= 30:
      self.__age = age
    else:
      print('Invalid value of attribute age')

cat = Cat('Maggie', 3)
# Wrong value
cat.set_age(-23) 
cat.set_age(8)
print(cat.get_age())

Note

We added data validation inside the set_age() method. Only the correct integer value can be assigned to the attribute.

Tout était clair ?

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Section 2. Chapitre 2

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