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Why does last([]) crash with IndexError: list index out of range?
last() reads xs[len(xs)], one past the end 1. Return xs[-1] and guard the empty list:
def last(xs):
if not xs:
raise ValueError("last() of an empty list")
return xs[-1]
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def last(xs):
- return xs[len(xs)]
+ if not xs:
+ raise ValueError("last() of an empty list")
+ return xs[-1]
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Answers about libraries and APIs come with links you can check.
- 1
Built-in Types: common sequence operationsdocs.python.org
- 2
IndexError: list index out of rangestackoverflow.com
- 3
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