Deck 4: Lists and Indexing
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Last updated 8:58 PM on 8/10/26
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7 Terms
1
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What does genes[0] return for genes = ['BRCA1', 'TP53', 'EGFR', 'MYC']?
'BRCA1' → indexing starts at 0
2
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What does genes[-1] return?
'MYC' → the last item in the list
3
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What does genes[1:3] return?
['TP53', 'EGFR'] → items at index 1 up to (not including) index 3
4
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Why does indexing start at 0 in Python?
Index n means "n steps from the start," so the first item is 0 steps away
5
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What does genes[:2] return?
The first 2 items (implicit start at index 0)
6
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What does genes[2:] return?
Everything from index 2 onward (implicit end at the last item)
7
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What's the rule for slice length?
The slice length equals end - start (e.g. genes[1:3] has 3 - 1 = 2 items)