The __init__ Method and Instance Attributes
Explore how to use the __init__ method in Python classes to automatically initialize instance attributes during object creation. Understand how self binds parameters to each unique instance, enabling objects to maintain independent states and preventing errors caused by missing attributes.
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In the previous lesson, we defined a class and created objects, but the instances did not contain any initialized attributes. Attributes then had to be assigned manually after creating each instance. This approach is tedious and error-prone. If a required attribute, such as a ship’s fuel level, is not set, the program may fail later during execution. Python provides a standard mechanism to initialize an object with the required data when it is created.
The initializer (__init__)
Python uses a special method named __init__ to handle the setup of new objects. This is often called the initializer (or constructor). The name includes two underscores at the beginning and two at the end, identifying it as one of Python’s dunder (double underscore) magic methods.
When we create a new instance of a class, Python looks for this method. If it exists, Python executes it automatically immediately after the object is created in memory. ...