Reading a Traceback
~9 mindebugging
last_item is meant to return the final item of a list. It raises on every input. Fix it.
Examples
Returns the final item instead of raising IndexError
- Input
- last_item([1, 2, 3])
- Output
- 3
A single-item list returns that item
- Input
- last_item([42])
- Output
- 42
Works on strings as well as numbers
- Input
- last_item(["a", "b"])
- Output
- "b"
Hints
Hint 1
Work directly with the arguments and return the result rather than printing it.
Hint 2
Watch for this: still off by one.
Requirements
: a non-empty list
Return the final item.
Constraints
Standard library only, no imports required
Time limit: 200 ms, Memory: 64 MB
Try similar problems(4)
Where this shows up
~9 min
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Python
def last_item(values):
"""
Return the last item of a list.
This currently raises IndexError. Work out why and fix it.
Args:
values: a non-empty list
Returns:
The final item.
"""
return values[len(values)]