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From: Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid>
Newsgroups: fr.comp.lang.python
Subject: Re: Autre exercice : calculer la somme de x chiffres.
Date: Mon, 23 May 2022 12:56:36 +0200
Organization: =?utf-8?Q?Universit=C3=A9?= de Strasbourg
Message-ID: <877d6czfdn.fsf@universite-de-strasbourg.fr.invalid>
References: <t6dj6a$sg8$1@gioia.aioe.org> <t6djq7$1570$1@gioia.aioe.org>
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Benoit Izac <use.reply.to@INVALID.ADDRESS> writes:

> Le 22/05/2022 =C3=A0 17:11, Dominique a =C3=A9crit dans le message
> <t6djq7$1570$1@gioia.aioe.org>=C2=A0:
>
>> Inutile de passer par une composition de liste :
>>
>> def addition(x):
>>
>>     return sum(range(x+1))
>>
>> print (addition(int(input('Fin de la sommielle '))))
>>
>> Difficile sans doute d'=C3=AAtre plus concis...
>
> Mais on peut faire mieux en terme d'algorithme=C2=A0:
>
> def accumulate_sum_of(n):
>     return (n + 1) // 2 * (n + (n + 1) % 2)

Hmm, pourquoi pas simplement n * (n+1) // 2 ? (Ou (n+1)*(n+2)//2 si on
veut la somme jusqu'=C3=A0 n+1.)

-- Alain.