🌐 Mailman 3 June 2013 - Python-list - python.org

Re: Python Magazine
by DRJ Reddy June 1, 2013

June 1, 2013

Hello all, Was busy with work. Finally finished the job of registering the domain name. Will be live soon. The url is http://pythonmagazine.org. Hope we will be live soon. Regards, DRJ.

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Re: Apache and suexec issue that wont let me run my python script
by Νικόλαος Κούρας June 1, 2013

June 1, 2013

I was searchign all night long yesterday an i didn manged to get this workign. Please if someoen is expreinces with linux just help me out here a but.

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Re: Apache and suexec issue that wont let me run my python script
by Νικόλαος Κούρας June 1, 2013

June 1, 2013

Τη Σάββατο, 1 Ιουνίου 2013 8:38:17 π.μ. UTC+3, ο χρήστης Chris Angelico έγραψε: > You posted it FIFTEEN HOURS AGO on a low-traffic forum. > Sheesh! Learn a little patience. I think this is enough time for to get an answer, i dont think so meone would answer from there but if you know some other list i can sk this question please let me knwo and i'll ask there. All my script are python 3.x readyand koukos.py is as well, oits just that damn suexec issue that doesnt let my last script that all it does is to set a cookie to work properly. If you kwno the answer please advise me what it needs to be done. This will be my last question, all other issues have been taker care of.

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Re: Short-circuit Logic
by Steven D'Aprano June 1, 2013

June 1, 2013

On Fri, 31 May 2013 17:09:01 +1000, Chris Angelico wrote: > On Fri, May 31, 2013 at 3:13 PM, Steven D'Aprano > <steve+comp.lang.python(a)pearwood.info> wrote: >> What makes you think that the commutative law is relevant here? >> >> > Equality should be commutative. If a == b, then b == a. Also, it's > generally understood that if a == c and b == c, then a == b, though > there are more exceptions to that (especially in loosely-typed > languages). Who is talking about equality? Did I just pass through the Looking Glass into Wonderland again? *wink* We're talking about *approximate equality*, which is not the same thing, despite the presence of the word "equality" in it. It is non-commutative, just like other comparisons like "less than" and "greater than or equal to". Nobody gets their knickers in a twist because the >= operator is non- commutative. Approximate equality is not just non-commutative, it's also intransitive. I'm reminded of a story about Ken Iverson, the creator of APL. Iverson was a strong proponent of what he called "tolerant equality", and APL defined the = operator as a relative approximate equal, rather than the more familiar exactly-equal operator most programming languages use. In an early talk Ken was explaining the advantages of tolerant comparison. A member of the audience asked incredulously, “Surely you don’t mean that when A=B and B=C, A may not equal C?” Without skipping a beat, Ken replied, “Any carpenter knows that!” and went on to the next question. — Paul Berry The intransitivity of [tolerant] equality is well known in practical situations and can be easily demonstrated by sawing several pieces of wood of equal length. In one case, use the first piece to measure subsequent lengths; in the second case, use the last piece cut to measure the next. Compare the lengths of the two final pieces. — Richard Lathwell, APL Comparison Tolerance, APL76, 1976 See also here: http://www.jsoftware.com/papers/APLEvol.htm (search for "fuzz" or "tolerance". -- Steven

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netcdF4 variables
by Sudheer Joseph June 1, 2013

June 1, 2013

Dear members, I have been using python NetcdF for some time. I understand that we can get variables from a netcdf one by one by using temp=ncf.variable['temp'][:] but is there a way to get a list of variables with out the rest of the stuff as seen below? some hing like a list xx=nc,variables[:] should get me all variable names with out other surrounding stuff?? with best regards. Sudheer In [4]: ncf.variables Out[4]: OrderedDict([(u'LON', <netCDF4.Variable object at 0x254aad0>), (u'LAT', <netCDF4.Variable object at 0x254ab50>), (u'DEPTH1_1', <netCDF4.Variable object at 0x254abd0>), (u'TAX', <netCDF4.Variable object at 0x254ac50>), (u'DIF_FD1', <netCDF4.Variable object at 0x254acd0>), (u'DIF_FD2', <netCDF4.Variable object at 0x254ad50>), (u'DIF_FD3', <netCDF4.Variable object at 0x254add0>), (u'DIF_FD4', <netCDF4.Variable object at 0x254ae50>), (u'DIF_FD5', <netCDF4.Variable object at 0x254aed0>), (u'DEPTH', <netCDF4.Variable object at 0x254af50>), (u'DEPTH_bnds', <netCDF4.Variable object at 0x261b050>), (u'TIME', <netCDF4.Variable object at 0x261b0d0>), (u'TEMP_BIAS', <netCDF4.Variable object at 0x261b150>)])

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Re: Too many python installations. Should i remove them all and install the latest?
by Νικόλαος Κούρας May 31, 2013

May 31, 2013

Τη Σάββατο, 1 Ιουνίου 2013 3:15:22 π.μ. UTC+3, ο χρήστης Dennis Lee Bieber έγραψε: > On Fri, 31 May 2013 08:20:54 -0700 (PDT), ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ > > <nikos.gr33k(a)gmail.com> declaimed the following in > > gmane.comp.python.general: > > > > > I'am using CentOS v6.4 on my VPS and hence 'yum' install manager and i just tried: > > > > > > Code: > > > root@nikos [~]# which python > > > /usr/bin/python > > > root@nikos [~]# which python3 > > > /root/.local/lib/python2.7/bin/python3 > > > root@nikos [~]# which python3.3 > > > /root/.local/lib/python2.7/bin/python3.3 > > > root@nikos [~]# > > > > I'd be concerned that those 3/3.3 entries are showing up in a 2.7 > > installation directory! > > > > Other than that, I'd see if some of those of softlinks (or even > > hardlinks) to another... That is: /usr/bin/python maybe links to your > > python3.3, and your python3 also links to the python3.3 -- meaning you > > really only have one Python in the 3.x branch (you didn't check for 2.x) > > -- > > Wulfraed Dennis Lee Bieber AF6VN > > wlfraed(a)ix.netcom.com HTTP://wlfraed.home.netcom.com/ Thats exactly my thoughts. Can you please tell me HOW TO GET RID OF ALL PYTHON SETUPS except 2.6 that is needed for system core and then just install 3.3.2? also why cant i install 3.3.2 using yum. if i could instead of building from source then i wouldn't have this installed mess but i could simply yum remove python*

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Re: Create a file in /etc/ as a non-root user
by rusi May 31, 2013

May 31, 2013

On May 31, 7:42 pm, Chris Angelico <ros...(a)gmail.com> wrote: > On Sat, Jun 1, 2013 at 12:02 AM, Alister <alister.w...(a)ntlworld.com> wrote: > > /etc is used to store configuration files for the operating system & if > > you inadvertently corrupt the wrong one then you could kill the system. > > Expanding on this: > > http://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard > > The FHS applies to Linux, but you'll find it close to what other > Unix-like OSes use too. Yes the FHS is a good center for such discussions. Let me expand on this a bit. I am going to use debian/ubuntu+apt because I know it a bit. You can substitute RH/Centos+yum or whatever... Modern linuxes are SOAs (service oriented architectures) or cloud architectures even if we dont like the buzzwords. This means that when I install debian/ubuntu on my personal computer there is some kind of contract-ing that goes on between me and debian. Some of it legal, some semi-legal some entirely informal/ conventional but still very important. Legal: For example it may be 'my very own computer' but if I take sources under a certain license and use them in violation of that license I could get into legal trouble. Semi-legal: Free and not-free software can coexist in ways that are at least legally nebulous Conventional: Debian must not use the machine (and file-system in particular) in ways that disrespect me. Note I am not talking of obvious legal gaffes like stealing my private data but of more 'conventional' problems like strewing my home directory with meaningless temporary files. Likewise: I MUST RESPECT Debian's AREA. For example I cant go messing about in /usr/bin [the name 'usr' is misleading and unfortunate] and expect support from debian. So $ sudo rm /usr/bin/foo is improper whereas $ sudo apt-get purge foo is proper. And its improper because you are not to mess around in debian's area -- except for officially approved channels like 'apt-get purge…' -- just as debian is not to mess around in yours. And writing into /etc constitutes messing with debian (or whatever is your distro). So yes, as Chris suggested read the FHS. And consider using a 'public-messable' area like /usr/local instead of /etc. Actually the situation is more complicated: the deal is not between just ordinary users like you/me and the distro. There's - ordinary users like you/me - packagers - the distro - upstream each with their own rights and responsibilities. What these are and how to navigate them is best discussed in your distro's fora eg http://forums.debian.net/ http://ubuntuforums.org/forum.php

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Re: Too many python installations. Should i remove them all and install the latest?
by Νικόλαος Κούρας May 31, 2013

May 31, 2013

Τη Παρασκευή, 31 Μαΐου 2013 8:55:51 μ.μ. UTC+3, ο χρήστης Ian έγραψε: > On Fri, May 31, 2013 at 11:42 AM, Νικόλαος Κούρας <nikos.gr33k(a)gmail.com> wrote: > > > OMG i gave by mistake > > > > > > root@nikos [/]# rm -rf /root/.local/ > > > > > > did i screwed up my remote VPS which i host 10 peoples webpages? > > > > I don't know, is that where you were keeping the data? > > > > The website still appears to be working, as best I can tell from this > > computer. I've never actually been able to view it from here, because > > I get a UnicodeDecodeError at this line: > > > > host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] > > > > But at least I'm still seeing that error, so the server is still > > responding to requests. Everything seem to be workign as expected, my webiste and the other 10 client websites just chhecked. luckily i keep my stuff at /homw/nikos so there are untouched. i hope i havent deleted anything though system need form /root/.local but i guess this is where root's user personal stuff and instalation of python from source where. i ddidnt know if it has soemhtign else. root@nikos [/]# which python /usr/bin/python root@nikos [/]# which python3 /root/.local/lib/python2.7/bin/python3 root@nikos [/]# which python3.3 /usr/local/bin/python3.3 root@nikos [/]# ls -l /usr/bin/py pydoc pygettext.py python python2.6 python3 pyflakes pynche python2 python2.6-config python-config root@nikos [/]# ls -l /usr/bin/python* -rwxr-xr-x 3 root root 4864 Feb 22 02:00 /usr/bin/python* lrwxrwxrwx 1 root root 6 Apr 5 20:34 /usr/bin/python2 -> python* -rwxr-xr-x 3 root root 4864 Feb 22 02:00 /usr/bin/python2.6* -rwxr-xr-x 1 root root 1418 Feb 22 02:00 /usr/bin/python2.6-config* lrwxrwxrwx 1 root root 24 Apr 7 22:10 /usr/bin/python3 -> /opt/python3/bin/python3* lrwxrwxrwx 1 root root 16 Apr 5 20:35 /usr/bin/python-config -> python2.6-config* root@nikos [/]# please tell me how to unistall python 2.6 and just keep 2.7 and install 3.3.2 please uisng yum. yum install python3 doesnt work for me.

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Re: Too many python installations. Should i remove them all and install the latest?
by Νικόλαος Κούρας May 31, 2013

May 31, 2013

Τη Σάββατο, 1 Ιουνίου 2013 2:55:38 π.μ. UTC+3, ο χρήστης Ian έγραψε: > On Fri, May 31, 2013 at 5:30 PM, Νικόλαος Κούρας <nikos.gr33k(a)gmail.com> wrote: > > > Indeed i have comiled python 2.7 and 3.3 form source after wget and > > > ./configure an make install > > > > > > but i belive somehting is mixed up althouh python works ok. > > > > > > root@nikos [/opt/python3/bin]# ls -al > > > ... > > > root@nikos [/opt/python3/bin]# make help > > > make: *** No rule to make target `help'. Stop. > > > root@nikos [/opt/python3/bin]# > > > > > > > > > cant remove it. > > > > The Makefile would be located in the source directory where you built > > Python, not in the installation directory. But in any case, I don't > > think the Python Makefile includes an uninstall option. If you want > > to uninstall Python that was built from source, you need to remove the > > files by hand. > > > > > Why you say i cant just yum install python3.3.2 > > > > Because CentOS 6 evidently does not provide a package for any version > > of Python other than 2.6. If you want to install another version, you > > will need to do it from source. Do you think that i should have my VPS copmany to install ubuntu for me and use apt-get install python3 ? I think ubuntu is friendlier.

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