CODEWITHSUNDEEP
pythonnumpy
qqqwww
qqqwww

Reputation: 531

python numpy range() and sum(-1)

Python question:

print(sum(range(5),-1)) 
from numpy import * 
print(sum(range(5),-1))

9
10

What is logical behind it? Thank you

Upvotes: 2

Views: 3103

Answers (1)

leovp
leovp

Reputation: 4758

numpy.sum() signature is as follows (with some arguments omitted):

numpy.sum(a, axis=None, dtype=None, out=None, ...)

Python's sum signature:

sum(iterable, start=0)

sum iterates over supplied iterable, sums the values, and then adds -1 (i.e. substracts 1). numpy.sum just sums all the values from supplied iterable, and receives an axis parameter as 1, which in your case doesn't change the behaviour.

Upvotes: 4

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