[Solved] Which code snippet below best illustrates the concept of duck typing in Python? - Ans: class Writer: def write(self): print('Writing') def perform_action(obj):... | Python

Python - Polymorphism and Dynamic Behavior

Which code snippet below best illustrates the concept of duck typing in Python?

A

<pre>class Writer:
    def write(self):
        print('Writing')

perform_action = lambda obj: obj.write() if hasattr(obj, 'write') else None
perform_action(Writer())</pre>

B

<pre>class Writer:
    def write(self):
        print('Writing')

def perform_action(obj):
    if isinstance(obj, Writer):
        obj.write()</pre>

C

<pre>class Writer:
    def write(self):
        print('Writing')

def perform_action(obj):
    obj.write()

perform_action(Writer())</pre>

D

<pre>class Writer:
    def write(self):
        print('Writing')

perform_action = lambda obj: obj.write() if type(obj) == Writer else None
perform_action(Writer())</pre>

Step-by-Step Solution

Solution:

Step 1: Understand duck typing
Duck typing means an object's suitability is determined by the presence of methods/attributes, not its type.

Step 2: Analyze options

class Writer:
    def write(self):
        print('Writing')

def perform_action(obj):
    obj.write()

perform_action(Writer())

calls obj.write() directly without type checks, relying on the method's presence, which is duck typing.

class Writer:
    def write(self):
        print('Writing')

def perform_action(obj):
    if isinstance(obj, Writer):
        obj.write()

uses isinstance(), which is explicit type checking.

class Writer:
    def write(self):
        print('Writing')

perform_action = lambda obj: obj.write() if hasattr(obj, 'write') else None
perform_action(Writer())

uses hasattr() which is duck typing but wrapped in a lambda and conditional, less direct.

class Writer:
    def write(self):
        print('Writing')

perform_action = lambda obj: obj.write() if type(obj) == Writer else None
perform_action(Writer())

uses type() equality, which is strict type checking.

Final Answer:

class Writer: def write(self): print('Writing') def perform_action(obj): obj.write() perform_action(Writer())
best demonstrates duck typing.

Quick Check:
Direct method call without type checks [OK]

Quick Trick: Duck typing calls methods directly without type checks [OK]

Common Mistakes:

MISTAKES

Confusing duck typing with explicit type checks
Using isinstance() or type() instead of method presence
Assuming hasattr() is always duck typing without direct calls

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More Python Quizzes

Which code snippet below best illustrates the concept of duck typing in Python?

Step 1: Understand duck typing

Step 2: Analyze options

Final Answer:

Quick Check:

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