[Solved] What is the error in this code snippet?class B: def __init__(self): self.__val = 5 b = B() print(b.__val) | Python

Python - Encapsulation and Data Protection

What is the error in this code snippet?

class B:
    def __init__(self):
        self.__val = 5

b = B()
print(b.__val)

ASyntaxError due to double underscores

BNo error, prints 5

CTypeError because __val is private

DAttributeError because __val is name mangled

Step-by-Step Solution

Solution:

Step 1: Understand name mangling effect
__val is mangled to _B__val internally, so b.__val does not exist.
Step 2: Accessing __val causes AttributeError
Trying to print b.__val raises AttributeError because the attribute is hidden by name mangling.
Final Answer:
AttributeError because __val is name mangled -> Option D
Quick Check:
Accessing __val directly = AttributeError [OK]

Quick Trick: Access mangled attribute with _ClassName__attr [OK]

Common Mistakes:

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