sum() is wonderful.

>>> nums = [1,2,3]
>>> sum(nums)
6
>>> product(nums)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'product' is not defined
>>>

I understand that there is no product() or prod(). Does anybody
here know why that was not included in the language? It seems
as if it would be useful, so there must have been some rationale
for that decision.

--
Michael F. Stemper
87.3% of all statistics are made up by the person giving them.

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Supersedes: <prod-20220707195304@ram.dialup.fu-berlin.de>
[added ", 1"]

"Michael F. Stemper" <michael.stemper@gmail.com> writes:

sum() is wonderful.

nums = [1,2,3]
sum(nums)

6

product(nums)

This is a contrived example. As such, it does not represent
real-world statistics about the frequency of the need for
"product" versus "sum".

I understand that there is no product() or prod(). Does anybody
here know why that was not included in the language? It seems
as if it would be useful, so there must have been some rationale
for that decision.

Unlike "+", "sum" is not part of the languge proper,
but of the standard library. Everything comes at a cost,
so the frequency of its usage must outweigh the costs of
its inclusion.

product = lambda i: functools.reduce( operator.mul, i, 1 )

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On Thu, 7 Jul 2022 at 22:55, Michael F. Stemper
<michael.stemper@gmail.com> wrote:

sum() is wonderful.

>>> nums = [1,2,3]
>>> sum(nums)
6
>>> product(nums)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'product' is not defined
>>>

I understand that there is no product() or prod(). Does anybody
here know why that was not included in the language? It seems
as if it would be useful, so there must have been some rationale
for that decision.

There is math.prod:

>>> from math import prod
>>> prod([1, 2, 3, 4])
24

https://docs.python.org/3/library/math.html#math.prod

--
Oscar

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On 07/07/2022 19.06, Oscar Benjamin wrote:

On Thu, 7 Jul 2022 at 22:55, Michael F. Stemper
<michael.stemper@gmail.com> wrote:

sum() is wonderful.

I understand that there is no product() or prod(). Does anybody
here know why that was not included in the language? It seems
as if it would be useful, so there must have been some rationale
for that decision.

There is math.prod:

>>> from math import prod
>>> prod([1, 2, 3, 4])
24

https://docs.python.org/3/library/math.html#math.prod

I did not know that. Thanks.


--
Michael F. Stemper
Outside of a dog, a book is man's best friend.
Inside of a dog, it's too dark to read.

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