Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: "yehudak ." Newsgroups: comp.lang.python Subject: Re: Trailing zeros of 100! Date: Sat, 2 Jan 2016 15:14:34 +0200 Lines: 51 Message-ID: References: <52ccbc4b-616b-4186-8802-97aaa5b0d9af@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: news.uni-berlin.de BVsbOulpNtmW+vsHd4iiUQ18sdvwKxg7bjPuZTyJHiIg== Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'python,': 0.02; 'resulting': 0.04; 'newbie': 0.05; 'trailing': 0.07; 'cc:addr :python-list': 0.09; 'zeros': 0.09; 'python': 0.10; 'jan': 0.11; ':-)': 0.12; '>>>': 0.15; '"0"': 0.16; '2016': 0.16; 'cc:name:python': 0.16; 'failed.': 0.16; 'preserved': 0.16; 're,': 0.16; 're.search(': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'wrote:': 0.16; 'string': 0.17; 'module,': 0.18; 'skip:l 30': 0.18; '>': 0.18; 'email addr:gmail.com>': 0.18; 'input': 0.18; '>>>': 0.20; 'math': 0.20; 'cc:2**0': 0.20; 'cc:addr:python.org': 0.20; 'text,': 0.22; 'trying': 0.22; 'help.': 0.23; 'sat,': 0.23; 'import': 0.24; 'header:In-Reply- To:1': 0.24; 'message-id:@mail.gmail.com': 0.27; 'regular': 0.29; 'indentation': 0.29; "i'm": 0.30; 'url:mailman': 0.30; 'code': 0.30; 'skip:s 30': 0.31; 'url:python': 0.33; 'url:listinfo': 0.34; 'me?': 0.34; 'received:google.com': 0.35; 'i.e.': 0.35; 'but': 0.36; 'there': 0.36; 'url:org': 0.36; 'lines': 0.36; 'received:209.85': 0.36; 'pm,': 0.36; 'subject:: ': 0.37; 'skip:& 10': 0.37; 'version': 0.38; 'received:209': 0.38; 'thank': 0.38; 'received:209.85.220': 0.38; 'hi,': 0.38; 'end': 0.39; 'rather': 0.39; 'url:mail': 0.40; 'some': 0.40; 'show': 0.62; 'more': 0.63; 'skip:\xc2 10': 0.67; 'chinese': 0.79; 'here!': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=vCJHx2eQgggGIIXaVbeul3X658VexwuB02T8k6iWXIE=; b=Z4JrsXRJXeJPmzVOY4pNbcpcDzvf9nBHOKRvxCagbSRcUZsRIJQ9EdESK1gd/fO6d2 KerDbzfoAh/udQYoWY5/sO1OMSZo6N3mBzAlEDjtRD22NDfq+P2GdRo+3c54Ip6VyPrO HS76Ch+yeb/ZLHInt5PZ04CE21feXtHpxDmO01gyDdV7ogvFxu4MKlDoRwmcbfNhmhF0 Yy4QBR1aSI7OP7bZx2X9PjCcNJVTOQW6Ffqq0oubUB/3OPGQR/CiHOmtshtB9WU7ClvZ QAVFdspJwn5uK68nUz7xe58nGJSQIjh4LEvh1ImpPpZMuiDJezKRhD9gxmRwSEZbWuyT daGw== X-Received: by 10.55.72.70 with SMTP id v67mr102920871qka.47.1451740474246; Sat, 02 Jan 2016 05:14:34 -0800 (PST) In-Reply-To: X-Mailman-Approved-At: Sat, 02 Jan 2016 09:31:47 -0500 X-Content-Filtered-By: Mailman/MimeDel 2.1.20+ X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com comp.lang.python:101145 Vlastimil, Thank you so much, but... All that is Chinese for me. Can you show a 'normal' Python code for me? Yehuda On Sat, Jan 2, 2016 at 2:44 PM, Vlastimil Brom wrote: > 2016-01-02 12:49 GMT+01:00 : > > Hi, newbie here! > > I'm trying to write a python program to find how many trailing zeros are > in 100! (factorial of 100). > > I used factorial from the math module, but my efforts to continue > failed. Please help. > > > > Thank you, > > Yehuda > > -- > > https://mail.python.org/mailman/listinfo/python-list > > Hi, > rather an illustration of the available tools in python, than a > (submittable) solution: > > >>> import re, math > >>> len(re.search(r"0*$", str(math.factorial(100))).group()) > 24 > [or the same code on more lines with some indentation - if it is > preserved via e-mail] > >>> len( > ... re.search( > ... r"0*$", > ... str( > ... math.factorial(100) > ... ) > ... ).group() > ... ) > 24 > >>> > > I.e. You need the length of the string resulting as the match of the > regular expression search for a pattern representing zero or more "0" > at the end of the input text, which is the string version of 100! > > Of course, there are other ways to get this result :-) > > regards, > vbr >