What will be the output of the following Python code?class A: def __init__(self): self.__x = 1class B(A): def display(self): print(self.__x)def main(): obj = B() obj.display()main()10Error, invalid syntax for object declarationError, private class member can’t be accessed in a subclass
Question
What will be the output of the following Python code?class A: def init(self): self.__x = 1class B(A): def display(self): print(self.__x)def main(): obj = B() obj.display()main()10Error, invalid syntax for object declarationError, private class member can’t be accessed in a subclass
Solution
The output of the provided Python code will be an error, specifically an AttributeError. This is because the variable __x is a private member of class A, and it cannot be accessed directly in a subclass (class B in this case). In Python, variables that start with double underscores are considered private.
Here's the step by step explanation:
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Class A is defined with a private member __x, which is initialized to 1 in the constructor.
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Class B is a subclass of A and has a method display() which tries to print the value of __x.
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In the main() function, an object of class B is created and the display() method is called.
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When the display() method is executed, it tries to access the private member __x of the superclass A. However, in Python, private members cannot be accessed directly outside the class they are defined in, not even in a subclass.
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Therefore, an AttributeError is raised, indicating that B object has no attribute '_B__x'.
So, the correct answer is "Error, private class member can’t be accessed in a subclass".
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