Solution:Step 1: Understand default mutable argument handlingfeatures default is None, so inside constructor it is replaced with a new list to avoid shared mutable default.Step 2: Analyze object creations and printsg1 uses default features list ['Bluetooth', 'WiFi'], g2 uses provided ['GPS']. Printi

[Solved] Consider this class:class Gadget: def __init__(self, name='Gizmo', features=None): if features is None: features = ['Bluetooth', 'WiFi'] self.name = name self.... | Python

Python - Constructors and Object Initialization

Consider this class:

class Gadget:
    def __init__(self, name='Gizmo', features=None):
        if features is None:
            features = ['Bluetooth', 'WiFi']
        self.name = name
        self.features = features

g1 = Gadget()
g2 = Gadget(features=['GPS'])
print(g1.features, g2.features)

What is the output?

A['Bluetooth', 'WiFi'] ['Bluetooth', 'WiFi']

BNone ['GPS']

C['Bluetooth', 'WiFi'] ['GPS']

DError: Default mutable argument

Step-by-Step Solution

Solution:

Step 1: Understand default mutable argument handling
features default is None, so inside constructor it is replaced with a new list to avoid shared mutable default.
Step 2: Analyze object creations and prints
g1 uses default features list ['Bluetooth', 'WiFi'], g2 uses provided ['GPS']. Printing shows these lists.
Final Answer:
['Bluetooth', 'WiFi'] ['GPS'] -> Option C
Quick Check:
Use None to avoid mutable default bugs [OK]

Quick Trick: Use None as default for mutable types [OK]

Common Mistakes:

Using mutable defaults directly
Expecting shared list between instances
Confusing None with empty list

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Consider this class:

Step 1: Understand default mutable argument handling

Step 2: Analyze object creations and prints

Final Answer:

Quick Check:

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