Python - Polymorphism and Dynamic Behavior
Which of the following Python code snippets correctly demonstrates duck typing?
Which of the following Python code snippets correctly demonstrates duck typing?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify duck typing usage
Duck typing means using an object if it has the needed method, without checking its type.Step 2: Analyze each option
def quack(duck): if hasattr(duck, 'quack'): duck.quack() class Duck: def quack(self): print('Quack!') quack(Duck()) useshasattrto check for method presence, which fits duck typing. Options B and C check type explicitly, which is not duck typing. def quack(duck): duck.quack() class Duck: def quack(self): print('Quack!') quack(Duck()) assumes the object has the method but does not check, which is okay but less safe than A.Final Answer:
Using hasattr to check method presence before calling -> Option AQuick Check:
hasattr check = duck typing safe use [OK]
Quick Trick: Look for method presence checks, not type checks [OK]
Common Mistakes:
- Confusing type checking with duck typing
- Ignoring method presence before calling
- Assuming duck typing requires no checks at all
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