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2

Note that the first option should not be used, since it only works correctly only when each item in the sequence is unique.
– Stam Kaly
Commented Dec 19, 2018 at 14:05
6

First option is O(n²), a terrible idea. If your list is 1000 elements long, it'll take literally a 1000 times longer than using enumerate. You should delete this answer.
– user3064538
Commented Apr 20, 2019 at 10:24

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create code fences with backticks ` or tildes ~
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like so
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```
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