Constructor
Constructor is a unique method that is automatically called during object creation. This method is not obligatory to define. The object can be created with the constructor generated automatically, as we did before.
Constructor syntax
Constructor has reserved name __init__().
Code
After the object is created, it contains name and hair_color attributes, that are created during the constructor call.
If we don't input any values of name or hair_color, these attributes automatically have default values: 'Kitty', 'black'.
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class Cat:
def __init__(self, name = 'Kitty', hair_color = 'black'):
self.name = name
self.hair_color = hair_color
print(Cat)
123456class Cat: def __init__(self, name = 'Kitty', hair_color = 'black'): self.name = name self.hair_color = hair_color print(Cat)
Test the code below!
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class Cat:
def __init__(self, name = 'Kitty', hair_color = 'black'):
self.name = name
self.hair_color = hair_color
print(name, 'cat with the', hair_color, 'hair')
# An object without adding attribute values
cat1 = Cat()
# An object with adding attribute values
cat2 = Cat('Eva', 'white')
12345678910class Cat: def __init__(self, name = 'Kitty', hair_color = 'black'): self.name = name self.hair_color = hair_color print(name, 'cat with the', hair_color, 'hair') # An object without adding attribute values cat1 = Cat() # An object with adding attribute values cat2 = Cat('Eva', 'white')
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Osio 1. Luku 5
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