Python - Magic Methods and Operator Overloading
To make a custom class support both the len() function and element access via indexing (e.g., obj[0]), which magic methods must be implemented?
To make a custom class support both the len() function and element access via indexing (e.g., obj[0]), which magic methods must be implemented?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: len() support
Implement __len__ to return the number of elements.Step 2: Indexing support
Implement __getitem__ to allow access via obj[index].Final Answer:
__len__ and __getitem__ -> Option BQuick Check:
__len__ for length, __getitem__ for indexing [OK]
Quick Trick: Use __len__ for length, __getitem__ for indexing [OK]
Common Mistakes:
- Using non-existent magic methods like __length__
- Confusing __index__ with __getitem__
- Not implementing both methods for full behavior
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