Saturday 30 March 2024

Python Coding challenge - Day 160 | What is the output of the following Python Code?


Let's break down the code snippet step by step:

class MyClass:

    def __init__(self):

        self.__x = 10

Here, we define a class named MyClass. It has a constructor method __init__ which initializes an instance variable __x with the value 10. The __x variable is prefixed with double underscores, making it a private variable.

obj = MyClass()

We then create an instance of the MyClass class called obj. This invokes the constructor method __init__() of the MyClass class, setting the __x attribute to 10.

obj.__x = 20

Here, we try to assign a value of 20 to the __x attribute of the obj instance. However, Python is dynamically typed, so this line actually creates a new attribute __x in the obj instance, distinct from the __x attribute defined in the class. Since the attribute in the class is private, it cannot be accessed or modified directly from outside the class.


This line tries to print the value of the __x attribute of the obj instance. However, due to the previous line, there are now two __x attributes associated with the obj instance: one created in the class and another created directly in the instance. So, obj.__x refers to the newly created attribute __x in the instance, not the one defined in the class. Therefore, it prints 20.

In summary, even though the class MyClass has a private attribute __x, the code snippet demonstrates how Python's dynamic nature allows the creation of a new instance attribute with the same name, leading to confusion about which attribute is being accessed or modified.


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