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Linear Algebra
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# Python | __init__ constructor

schedule Mar 5, 2023
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Python
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Python's `__init__` constructor is one of the default methods used for instantiating objects from a class.

# Examples

To define a class `Cat` and instantiate an object from it:

``` class Cat(): # This is constructor for python def __init__(self, name, age): self.name = name self.age = age # Teaching each cat how to meow def meow(self): print("I am a " + str(self.age) + " year old " + self.name)# Creating an instance my_cat representing my cat Roxasmy_cat = Cat("Roxas", 26)my_cat.meow() I am a 26 year old Roxas ```

The `self` parameter must be provided and it must be provided first in the definition. However, when we instantiate an object, the self argument is automatically passed through hence it does not be provided.

Any variable prefixed with `self` is available to every method in the class. Hence, in the above example `name` and `age` variables are available to every method within class `Cat`. Variables that are associated with `self` (i.e. associated with the instance of the class) are referred to as attributes.

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