[Solved] How do you correctly declare a protected attribute named _level inside a Python class? — Ans: def __init__(self): self._level = 0 | Python

Python - Encapsulation and Data Protection

How do you correctly declare a protected attribute named _level inside a Python class?

Adef __init__(self): self.level = 0

Bdef __init__(self): self._level = 0

Cdef __init__(self): self.__level = 0

Ddef __init__(self): _level = 0

Step-by-Step Solution

Solution:

Step 1: Understand attribute declaration
Attributes are usually declared inside the constructor using self.
Step 2: Protected attribute naming
Protected attributes use a single underscore prefix, e.g., self._level.
Step 3: Analyze options
def __init__(self): self._level = 0 correctly assigns self._level = 0 inside __init__. def __init__(self): self.level = 0 lacks underscore, C uses double underscore (private), D assigns to a local variable.
Final Answer:
def __init__(self): self._level = 0 -> Option B
Quick Check:
Use self._name for protected attributes [OK]

Quick Trick: Use self._name inside __init__ for protected attributes [OK]

Common Mistakes:

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How do you correctly declare a protected attribute named _level inside a Python class?