Iterating over a list and indexing with the result leads to TypeError

• iterate
• index
• list

The OP iterates over a list, thinking this provides the indices of the list. Attempting to get the elements by indexing then fails:
python
for i in some_list: # <<< wrong assumption
value = some_list[i] # <<< actual error


• Why do I get an IndexError (or TypeError, or just wrong results) from "ar[i]" inside "for i in ar"?
• TypeError: list indices must be integers or slices, not list