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При использовании reduce:
from functools import reduce print(reduce(lambda x, y: x+y, [])) TypeError: reduce() of empty sequence with no initial value
print(sum(int(input()) for i in range(int(input()))))
Офлайн
>>> reduce(lambda x, y: x+y, []) Traceback (most recent call last): File "<input>", line 1, in <module> reduce(lambda x, y: x+y, []) TypeError: reduce() of empty sequence with no initial value >>> reduce(lambda x, y: x+y, [], 0) 0
Онлайн