Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.mixmin.net!hq-usenetpeers.eweka.nl!81.171.88.15.MISMATCH!eweka.nl!lightspeed.eweka.nl!194.134.4.91.MISMATCH!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.045 X-Spam-Evidence: '*H*': 0.91; '*S*': 0.00; 'parameter': 0.07; 'explanation': 0.09; 'def': 0.10; '1).': 0.16; 'formula': 0.16; 'function).': 0.16; 'wrote:': 0.17; 'subject:need': 0.17; 'math': 0.20; 'header:In-Reply-To:1': 0.25; 'header:User-Agent:1': 0.26; 'subject:please': 0.27; 'function': 0.30; 'to:addr:python-list': 0.33; 'received:google.com': 0.34; 'received:209.85': 0.35; 'message-id:@gmail.com': 0.36; 'previous': 0.37; 'received:209': 0.37; 'subject:: ': 0.38; 'gives': 0.39; 'to:addr:python.org': 0.39; 'received:192': 0.39; 'received:192.168': 0.40; 'lower': 0.61; 'provide': 0.62; 'skip:n 10': 0.63; 'email addr:gmail.com': 0.63; 'multiply': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:message-id:date:from:user-agent:mime-version:to:subject :references:in-reply-to:content-type; bh=9Whx++m9cWBir2/t2mkHOOJdmKMfnwGQPJ+a8zzIUPE=; b=WlAvxGQo3Ed8EzsP1OoiktctJ5ELto4fHu9UqjakF2gzkdtWHlUM46Ns1MZnX1184Z yMUNUWC6laD7Y3ZExhJvV2AIWsZ8ki4CF3P03E9hyNjVP8mpfjan5a1wt2KAlBCwfsvv nnNUhYj9BjU2tAM8ntF6cKrWAvp+Kl9oIrUphRhFGSzEnumCjdJRGsB/IiPXJDp+erBY oJAEQu/lsCfm2Ba12mi0aNAgse3gfQc0EoPc6b5MD3UnpjO1P4424HgtVQAAAG7MC/uV BIlhQuuc0YLFyZVudqUujZccPypjl0wwXJtFvOK5PaPfMoYf5dqymYmATsLmKJ/8kAUP KAXQ== X-Received: by 10.112.51.175 with SMTP id l15mr29839862lbo.5.1357898378418; Fri, 11 Jan 2013 01:59:38 -0800 (PST) Date: Fri, 11 Jan 2013 10:59:30 +0100 From: Karim User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 MIME-Version: 1.0 To: python-list@python.org Subject: Re: please i need explanation References: <2FB5A66FD91D456BBDFCC0AE25760392@favour> In-Reply-To: <2FB5A66FD91D456BBDFCC0AE25760392@favour> Content-Type: multipart/alternative; boundary="------------000305030409040003010301" X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 78 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1357898744 news.xs4all.nl 6971 [2001:888:2000:d::a6]:44982 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:36612 This is a multi-part message in MIME format. --------------000305030409040003010301 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 11/01/2013 16:35, kwakukwatiah@gmail.com wrote: > def factorial(n): > if n<2: > return 1 > f = 1 > while n>= 2: > f *= n > f -= 1 > return f > > What explanation this a function representing the math factorial. You provide a parameter n: if n est lower than 2 the factorial is 1 (return by the function). in other case you multiply previous factoriel value by n (f *= n <=> f = f *n). And you decrement n by 1 (f -=1 <=> f = f - 1). This gives n*(n-)*(n-2).... general formula for factorial. Regards Karim --------------000305030409040003010301 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit
On 11/01/2013 16:35, kwakukwatiah@gmail.com wrote:
def factorial(n):
    if n<2:
             return 1
    f = 1
    while n>= 2:
        f *= n
        f -= 1
    return f
 


What explanation this a function representing the math factorial.

You provide a parameter n:

if n est lower than 2 the factorial is 1 (return by the function).
in other case you multiply previous factoriel value by n (f *= n <=> f = f *n).
And you decrement n by 1 (f -=1 <=> f = f - 1).
This gives n*(n-)*(n-2).... general formula for factorial.

Regards
Karim
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