🌐 Mailman 3 April 2010 - Python-list - python.org

newbie with a encoding question, please help
by Mister Yu April 1, 2010

April 1, 2010

hi experts, i m new to python, i m writing crawlers to extract data from some chinese websites, and i run into a encoding problem. i have a unicode object, which looks like this u'\xd6\xd0\xce\xc4' which is encoded in "gb2312", but i have no idea of how to convert it back to utf-8 to re-create this one is easy: this will work ============================ >>> su = u"中文".encode('gb2312') >>> su u >>> print su.decode('gb2312') 中文 -> (same as the original string) ============================ but this doesn't,why =========================== >>> su = u'\xd6\xd0\xce\xc4' >>> su u'\xd6\xd0\xce\xc4' >>> print su.decode('gb2312') Traceback (most recent call last): File "<console>", line 1, in <module> UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(128) =========================== thank you

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Re: associative array
by Javier Montoya April 1, 2010

April 1, 2010

On Mar 31, 7:36 pm, Gary Herron <gher...(a)digipen.edu> wrote: > JavierMontoyawrote: > > Dear all, > > > I'm a newbie in python and would be acknowledge if somebody could shed > > some light on associative arrays. > > More precisely, I would like to create a multi-dimensional associative > > array. I have for example a list of students which are identified > > uniquely by their student IDs. Additionally, for each student I have > > some information: FirstName, LastName, etc. > > > The array would have then the following form: > > [StudentID] => [FirstName][LastName][Telephone]...[ ... ] > > > I would like to be able to access a field directly by using a > > StudentID > > [StudentID][FirstName] > > [StudentID][LastName] > > > How could I manipulate such an array (create the array, add elements, > > access data)? > > > Best wishes > > Create a class for student with attributes for ID, FirstName, LastName, etc. > > class Student: > def __init__(self, id, FirstName, ...): > self.id = id > self.FirstName = FirstName > ... > > then whenever you create a student object, use a dictionary to associate > the object with its is > AA = {} # An empty dictionary > s = Student(...) > AA[s.id] = s > ... and repeat for many students... > > Then to access a student's object given an id: > s = AA[id] > print s.id, s.FirstName, s.LastName, ... > > I'd *not* call this a multi-dimension association, but rather just an > association between student objects and their ids. > > Hope that helps, > > Gary Herron > > -- > Gary Herron, PhD. > Department of Computer Science > DigiPen Institute of Technology > (425) 895-4418 Dear all, Thanks for your suggestions, it worked! As Gary suggested, I created a 'student' class and mapped its objects to a dictionary. Is it possible to sort the dictionary by the student's grades in descending order? Best wishes

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String Formatting Operations for decimals.
by Lacrima April 1, 2010

April 1, 2010

Hello! I need to format a decimal (floating point) number in the following way: 10 results in '10' 10.5 results in '10.5' 10.50 results in '10.5' 10.5678 results in 10.57 How can I achieve this using standard Python string formatting operations? Something like '%.2f' works almost as expected: >>> '%.2f' % 10.5 '10.50' >>> '%.2f' % 10.5678 '10.57' >>> '%.2f' % 10 '10.00' But I always need trailing zeros to be excluded, i.e. 10.5 should result in '10.5' (not '10.50'), and 10 should result in '10' (not '10.00'). So how can I do this? Sorry for my English. Thanks in advance. with regards, Maxim

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by Naeem April 1, 2010

April 1, 2010

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Re: sorting ascending/descending with operator.attrgetter
by Steven D'Aprano April 1, 2010

April 1, 2010

On Wed, 31 Mar 2010 22:19:27 -0400, Steve Holden wrote: > I'm the same myself, and I know from personal experience that while I am > (simply?) seeking accuracy and truth it sometimes bugs the hell out of > people ... By the way, why are we acting as if seeking accuracy and truth is a bad thing? Personally, if I were interviewing job applicants, one of the things I'd like to know is how well they react to criticism. This especially applies to technical and programming roles. I've managed thin-skinned prima donnas who spit the dummy if someone dares point out they made a mistake, and so long as I'm involved in the hiring process I won't be doing so again. Give me a pedantic, technically precise, obnoxiously *correct* coder over a sloppy one any time. -- Steven

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how to build with --enable-shared so that binary knows where libraries are.
by d d April 1, 2010

April 1, 2010

The following is on Linux. I'd like to build python with ./configure --enable-shared. And install in a non-standard place (an nfs-mounted directory). However, the binary is then not usable, since it can't find the library. I can fix this by defining LD_LIBRARY_PATH, but I don't want to do that. Doing anything system-specific is impractical, since many systems will point to this directory (LD_LIBRARY_PATH is feasible, though undesired, because it can be set in a common script that users call from their .cshrc files.) Is there a way to configure the build such that the binary will know where the shared library is? I found this: http://koansys.com/tech/building-python-with-enable-shared-in-non-standard-… It recommends LDFLAGS="-rpath <path to lib>", and mentions that you get a "compiler cannot create executables" error unless you first create the empty directory. But I get that error even when I do create the empty directory. Any help would be appreciated. --Dan

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Re: Re: Fetch files from mail in python
by hidura＠gmail.com April 1, 2010

April 1, 2010

Ok, I will take your advice and implemented in my project. Thank you all for your help. On Mar 31, 2010 3:03am, Dennis Lee Bieber <wlfraed(a)ix.netcom.com> wrote: > On Wed, 31 Mar 2010 00:47:47 +0000, hidura(a)gmail.com declaimed the > following in gmane.comp.python.general: > > I did that but i want to know if i have a file inside the mail how > could i > > download that file from my mail. > Top posting is undesirable... > As for "downloading"... At least with POP3 (I don't do IMAP), there > is NO "downloading" -- all attachments come down with the message. > What you need to do is parse out the portion of the body that > contains the "attachment". > -- > Wulfraed Dennis Lee Bieber AF6VN > wlfraed(a)ix.netcom.com HTTP://wlfraed.home.netcom.com/" > eudora="autourl">HTTP://wlfraed.home.netcom.com/ > -- > http://mail.python.org/mailman/listinfo/python-list

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sorting ascending/descending with operator.attrgetter
by Chris Curvey April 1, 2010

April 1, 2010

I must be having a brain cramp. Given a list of objects, how can I sort the list on one attribute in descending order, then sort within each group in ascending order on another attribute. For example: class Foo: def __init__(self, a, b, c): self.a = a self.b = b self.c = c I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort ascending on both attributes, but how could i sort by "a, descending, then b, ascending)?"

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Get Eclipse/PyDev to run scripts that don't end in .py
by J April 1, 2010

April 1, 2010

Is there any way to tell PyDev in Eclipse to run a script that doesn't end in .py? Even if I have to go and manually set something for each file... I've inherited (in a manner of speaking) a dev project that is done in python2.6... I pulled the latest dev branch and have it opened as a project in Eclipse, however, none of the python files end in .py, so PyDev only sees them as text files. And because of that, I can't run them in Eclipse to try my changes, debug, etc. So, is there a way to make them show up as python code without the .py extension? Because of this, I also don't get any of the fancy indenting and highlighting that I'd normally get... Cheers, Jeff

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Re: Get Eclipse/PyDev to run scripts that don't end in .py
by Martin P. Hellwig April 1, 2010

April 1, 2010

On 03/31/10 22:37, J wrote: > Is there any way to tell PyDev in Eclipse to run a script that doesn't > end in .py? Even if I have to go and manually set something for each > file... > > I've inherited (in a manner of speaking) a dev project that is done in > python2.6... I pulled the latest dev branch and have it opened as a > project in Eclipse, however, none of the python files end in .py, so > PyDev only sees them as text files. And because of that, I can't run > them in Eclipse to try my changes, debug, etc. > > So, is there a way to make them show up as python code without the .py > extension? Because of this, I also don't get any of the fancy > indenting and highlighting that I'd normally get... > > Cheers, > > Jeff You probably need to do that one level higher, i.e. in Eclipse (hint: Preferences>General>Editors>File Associations <don't forget to also add a 'Associated editors' for your new defined file type>). I do have a couple of remarks though. It sounds to me like you inherited something of more or less a 'shipped' product. Perhaps it would be wise to invest some time to restructure the project so that it works nicely with all the tools you have (unit testing, coverage, refactoring, etc.) and build a script that from your source builds the actually release (resembling that what you have inherited). <whining_mode status='on'> This question would probably have been more suitable in http://sourceforge.net/projects/pydev/forums/forum/293649 (that is the PyDev forum), and it is likely that they would have sent you through to http://www.eclipse.org/forums/ . </whining_mode> -- mph

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