Python - Encapsulation and Data Protection
Which of the following is the correct way to define a read-only property named age in a Python class?
Which of the following is the correct way to define a read-only property named age in a Python class?
easy📝 Syntax Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify read-only property syntax
A read-only property uses only the@propertydecorator on a method that returns the value.Step 2: Check options
@property
def age(self): return self._age correctly defines a read-only property. def age(self): return self._age
@age.setter
def age(self, value): self._age = value defines a setter, so not read-only. def get_age(self): return self._age
def set_age(self, value): self._age = value uses old getter/setter style, not property decorator. @property
def age(self, value): self._age = value incorrectly uses a parameter in a property getter.Final Answer:
@property
def age(self): return self._age -> Option BQuick Check:
Read-only property = only @property getter [OK]
Quick Trick: Read-only property has only @property getter method [OK]
Common Mistakes:
MISTAKES- Adding a setter for read-only property
- Using parameters in getter method
- Using old getter/setter methods without decorators
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