Python - Magic Methods and Operator Overloading
Why does
len() return the number of top-level elements in a nested list, not the total nested elements?Why does len() return the number of top-level elements in a nested list, not the total nested elements?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand len() behavior on nested lists
len() counts how many items are in the outer list, not inside nested lists.Step 2: Explain why it does not count nested elements
len() does not look inside nested lists automatically; it treats each nested list as one element.Final Answer:
Because len() counts only the outer list elements, not nested contents -> Option AQuick Check:
len() counts top-level elements only [OK]
Quick Trick: len() counts outer list items, not nested elements [OK]
Common Mistakes:
- Thinking len() flattens lists
- Assuming recursive counting
- Counting only first nested list
- Confusing len() with sum()
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