Re: Article on the future of Python
in 681910 20120927 131113 Devin Jeanpierre wrote: >On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano > wrote: >> On Tue, 25 Sep 2012 09:15:00 +0100, Mark Lawrence wrote: >> And a response: >> >> http://data.geek.nz/python-is-doing-just-fine > >Summary of that article: > >"Sure, you have all these legitimate concerns, but look, cake!" Quote : "This piece argues that Python is an easy-to-learn language that where you can be almost immediately productive in." -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
>>Summary of that article: >> >>"Sure, you have all these legitimate concerns, but look, cake!" > > Quote : "This piece argues that Python is an easy-to-learn > language that where you can be almost immediately productive in." It is, but so is every other language. "hello world" is the standard... follow the syntax, import/include the appropriate library functions, and create your own to use them. -- Best Regards, David Hutto CEO: http://www.hitwebdevelopment.com -- http://mail.python.org/mailman/listinfo/python-list
Re: REST code-golf: How concisely can you expose and consume services?
On Fri, Sep 28, 2012 at 3:41 PM, Alec Taylor wrote: > web2py (7 lines): https://gist.github.com/3798093 I love the idea, even though I shan't be entering. Code golf is awesome fun! My latest golf game involved importing code comments and text-file annotations into autodoc markup... with two one-liners. And it only needed two because I did it in two parts (wasn't even aware of the text file until I'd done the code comments). Of course, a real RESTful API is likely to have rather more guts in it, but it's cool how little you need of structure! ChrisA -- http://mail.python.org/mailman/listinfo/python-list
how to run shell command like "<
Hi, all, I have the shell command like this: sfdisk -uM /dev/sdb << EOT ,1000,83 ,,83 EOT I have tried subprocess.Popen, pexpect.spawn and os.popen, but none of these works, but when I type this shell command in shell, it is works fine. I wonder how to emulate this type of behavior in python , and if someone can figure out the reason why? The sample code of subprocess.Popen is: command = ["sfdisk", "-uM", target, "<-- http://mail.python.org/mailman/listinfo/python-list
Re: Reducing cache/buffer for faster display
On Fri, Sep 28, 2012 at 10:05 AM, Rikishi42 wrote: > The scripts in question only increase numbers. But should that not be the > case, solutions are simple enough. The numbers can be formatted to have a > fixed size. In the case of random line contents (a list of filesnames, say) > it's enough to create an output function that is aware of the length of the > previously printed line, and add enough spaces to the current one to wipe > exess content. Yep, that's a pretty effective way to do it. One simple method to it is to format the whole string as a single whole, then left justify it in a field of (say) 79 characters, and output that: msg = "Progress: %d%% (%d/%d)... %s" % (done*100/total, done, total, current_file) print msg.ljust(79)+"\r", sys.stdout.flush() ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: how to run shell command like "<
On Fri, Sep 28, 2012 at 1:15 PM, 叶佑群 wrote:
> Hi, all,
>
> I have the shell command like this:
>
> sfdisk -uM /dev/sdb << EOT
> ,1000,83
> ,,83
> EOT
>
>
> I have tried subprocess.Popen, pexpect.spawn and os.popen, but none of
> these works, but when I type this shell command in shell, it is works fine.
> I wonder how to emulate this type of behavior in python , and if someone can
> figure out the reason why?
>
> The sample code of subprocess.Popen is:
>
> command = ["sfdisk", "-uM", target, "< ",", 1000, ",", "83", "\r\n",
> ",", ",", "83", "\r\n", "EOT", "\r\n"]
>
> pobj = subprocess.Popen (command, bufsize=1, \
> stderr=subprocess.PIPE, stdout=subprocess.PIPE)
>
> res = pobj.stderr.readline ()
> if res is not None and pobj.returncode != 0:
> observer.ShowProgress (u"对设备 %s 分区失败！" % target)
> return False
>
The "< and pexpect code is:
>
> child = pexpect.spawn ("sfdisk -uM /dev/sdb < child.sendline ()
> child.sendline ()
> child.sendline ()
>
> and os.popen like this:
>
> os.popen ("sfdisk -uM /dev/sdb <
> I tried "\r\n", and it doesn't work either.
>
--
regards,
kushal
--
http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On 27/09/2012 20:08, Terry Reedy wrote: On 9/27/2012 5:33 AM, Steven D'Aprano wrote: Nevertheless, I think there is something here. The consequences are nowhere near as dramatic as jmf claims, but it does seem that replace() has taken a serious performance hit. Perhaps it is unavoidable, but perhaps not. If anyone else can confirm similar results, I already did, about a month ago, for windows. I think the actual problem is with find, not replace (which does a find before the replace). When I asked on pydev, Victor Stinner had no explanation, but said he might look into it eventually. Others thought it not terribly important since 7 times blazingly fast is still fast (in your example, 29 versus 3 microseconds per operation. jmf wrapping a possible real issue with anti-3.3 crud did not help in getting attention to the regression. I also reported results of running stringbench.py on both 3.2 and 3.3 on windows. Overall, Unicode is nearly as fast as bytes and 3.3 as fast as 3.2. Find/replace is the notable exception in stringbench, so it is an anomaly. Other things are faster in 3.3. I think this should be raised as a performance regression. I agree, and Mark did it. http://bugs.python.org/issue16061 and you should read it. I've tried to really muddy the waters by opening this issue, and the python devs are giving out facts, how dare they!!! It's just not my day is it? :( -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
"#!/usr/bin/env python" vs. "#!/usr/bin/python"?
Hello I've seen both shebang lines to run a Python script on a *nix host: #!/usr/bin/env python #!/usr/bin/python What's the difference? Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: "#!/usr/bin/env python" vs. "#!/usr/bin/python"?
Gilles writes: > #!/usr/bin/env python > #!/usr/bin/python > > What's the difference? Not much if your python is /usr/bin/python: env looks for python and finds the same executable. When python is not /usr/bin/python but something else that is still found by your system, /usr/bin/env still finds it. For example, in a server where I work, python3 is installed as something like /opt/python/3.2.2-gcc/bin/python3. There is no /usr/bin/python3 at all, but "#! /usr/bin/env python3" works. -- http://mail.python.org/mailman/listinfo/python-list
Re: "#!/usr/bin/env python" vs. "#!/usr/bin/python"?
In article <34va6856ocuas7jpueujscf3kdt7k44...@4ax.com>, Gilles wrote: > Hello > > I've seen both shebang lines to run a Python script on a *nix host: > > #!/usr/bin/env python > #!/usr/bin/python > > What's the difference? The first one looks through your PATH to find the right python interpreter to run. The second one is hard-wired to run /usr/bin/python. If you only have a single copy of python installed, it doesn't really matter which you use. But, you might as well get into the habit of using the /usr/bin/env flavor because it's more flexible. I'm working on a number of different python projects. For each one, I set up a new virtual environment using virtualenv. This lets me run different versions of python in different projects, with different collections of installed packages (and possibly different versions). I can only do this because I use the /usr/bin/env line in all my scripts. -- http://mail.python.org/mailman/listinfo/python-list
Re: "#!/usr/bin/env python" vs. "#!/usr/bin/python"?
On Fri, 28 Sep 2012 06:57:28 -0400, Roy Smith wrote: >The first one looks through your PATH to find the right python >interpreter to run. The second one is hard-wired to run /usr/bin/python. > >If you only have a single copy of python installed, it doesn't really >matter which you use. But, you might as well get into the habit of >using the /usr/bin/env flavor because it's more flexible. Thanks guys. I suspected that's what the difference was. -- http://mail.python.org/mailman/listinfo/python-list
How to investigate web script not running?
Hello
I'm trying to run my very first FastCGI script on an Apache shared
host that relies on mod_fcgid:
==
#!/usr/bin/python
from fcgi import WSGIServer
import cgitb
# enable debugging
cgitb.enable()
def myapp(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Hello World!\n']
WSGIServer(myapp).run()
==
After following a tutorial, Apache complains with the following when I
call my script:
==
Internal Server Error
The server encountered an internal error or misconfiguration and was
unable to complete your request.
==
Generally speaking, what tools are available to investigate issues
when running a Python web app?
Thank you.
--
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Re: Article on the future of Python
On Sep 27, 5:11 pm, Devin Jeanpierre wrote: > On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano > > wrote: > > On Tue, 25 Sep 2012 09:15:00 +0100, Mark Lawrence wrote: > > And a response: > > >http://data.geek.nz/python-is-doing-just-fine > > Summary of that article: > > "Sure, you have all these legitimate concerns, but look, cake!" > > -- Devin My summary of the first (worried about python) article: Python is about to miss the Bell's law bus: http://en.wikipedia.org/wiki/Bell%27s_Law_of_Computer_Classes -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
On 28/09/2012 12:57, Jayden wrote: Dear All, I have a concern in developing commercial code with Python. Someone told me that its program can be easily hacked to get its source code. Is it really the case? Any way to protect your source code? Thanks a lot! Jayden This question has been asked on numerous occasions so if you search the archives you're sure to get loads of answers. -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to investigate web script not running?
On Fri, 28 Sep 2012 13:37:36 +0200, Gilles wrote: >== >Internal Server Error > >The server encountered an internal error or misconfiguration and was >unable to complete your request. >== Looks like fcgi.py doesn't support WSGI: Traceback (most recent call last): File "hello.fcgi", line 2, in ? from fcgi import WSGIServer ImportError: cannot import name WSGIServer -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
On 09/28/2012 02:17 PM, Mark Lawrence wrote: On 28/09/2012 12:57, Jayden wrote: Dear All, I have a concern in developing commercial code with Python. Someone told me that its program can be easily hacked to get its source code. Is it really the case? Any way to protect your source code? Thanks a lot! Jayden This question has been asked on numerous occasions so if you search the archives you're sure to get loads of answers. http://stackoverflow.com/questions/261638/how-do-i-protect-python-code http://stackoverflow.com/questions/164137/how-do-i-deploy-a-python-desktop-application -- http://mail.python.org/mailman/listinfo/python-list
Re: How to investigate web script not running?
On Fri, 28 Sep 2012 13:37:36 +0200, Gilles wrote:
Hello
I'm trying to run my very first FastCGI script on an Apache shared
host that relies on mod_fcgid:
==
#!/usr/bin/python
from fcgi import WSGIServer
import cgitb
# enable debugging
cgitb.enable()
def myapp(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['Hello World!\n']
WSGIServer(myapp).run()
==
After following a tutorial, Apache complains with the following when I
call my script:
==
Internal Server Error
The server encountered an internal error or misconfiguration and was
unable to complete your request.
==
Do it the other way around:
# cgitb before anything else
import cgitb
cgitb.enable()
# so this error will be caught
from fcgi import WSGIServer
Regards,
Michael
--
http://mail.python.org/mailman/listinfo/python-list
Re: py2exe deal with python command line inside a program
> sys.executable was printed out as ''C:\\Python25\\python.exe'', how > can I make this work in executable package through py2exe? Does http://www.py2exe.org/index.cgi/WhereAmI help? -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On Fri, 28 Sep 2012 05:08:24 -0700, rusi wrote: > On Sep 27, 5:11 pm, Devin Jeanpierre wrote: >> On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano >> >> wrote: >> > On Tue, 25 Sep 2012 09:15:00 +0100, Mark Lawrence wrote: And a >> > response: >> >> >http://data.geek.nz/python-is-doing-just-fine >> >> Summary of that article: >> >> "Sure, you have all these legitimate concerns, but look, cake!" >> >> -- Devin > > My summary of the first (worried about python) article: Python is about > to miss the Bell's law bus: > > http://en.wikipedia.org/wiki/Bell%27s_Law_of_Computer_Classes Except that very concept is stupid. Mainframes have not be replaced. There are more mainframes around today than fifty years ago. Minicomputers too, only we don't call them minicomputers, we call them "servers". In ten years time, there will be more desktop PCs around than now. Most of them will be in the 90% of the world that isn't America. And most of them will be laptops. But they'll be used as desktops too. Not everybody wants to read email on a device smaller than your hand, clumsily poking at a tiny virtual keyboard. And anybody who thinks that Python can't run on tablets or smartphones hasn't been paying attention. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change' and
-- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On Sep 28, 5:54 pm, Steven D'Aprano wrote: > On Fri, 28 Sep 2012 05:08:24 -0700, rusi wrote: > > On Sep 27, 5:11 pm, Devin Jeanpierre wrote: > >> On Thu, Sep 27, 2012 at 2:13 AM, Steven D'Aprano > > >> wrote: > >> > On Tue, 25 Sep 2012 09:15:00 +0100, Mark Lawrence wrote: And a > >> > response: > > >> >http://data.geek.nz/python-is-doing-just-fine > > >> Summary of that article: > > >> "Sure, you have all these legitimate concerns, but look, cake!" > > >> -- Devin > > > My summary of the first (worried about python) article: Python is about > > to miss the Bell's law bus: > > >http://en.wikipedia.org/wiki/Bell%27s_Law_of_Computer_Classes > > Except that very concept is stupid. Mainframes have not be replaced. > There are more mainframes around today than fifty years ago. > Minicomputers too, only we don't call them minicomputers, we call them > "servers". > > In ten years time, there will be more desktop PCs around than now. Most > of them will be in the 90% of the world that isn't America. And most of > them will be laptops. But they'll be used as desktops too. Not everybody > wants to read email on a device smaller than your hand, clumsily poking > at a tiny virtual keyboard. > > And anybody who thinks that Python can't run on tablets or smartphones > hasn't been paying attention. > > -- > Steven It would be good to pay attention before calling others to pay attention. http://litmus.com/blog/email-client-market-share-stats-infographic-june-2012/email-client-market-share-june-2012 -- http://mail.python.org/mailman/listinfo/python-list
Re: "#!/usr/bin/env python" vs. "#!/usr/bin/python"?
On Fri, 28 Sep 2012 06:57:28 -0400 Roy Smith wrote: > > I've seen both shebang lines to run a Python script on a *nix host: > > > > #!/usr/bin/env python > > #!/usr/bin/python > > > > What's the difference? > > The first one looks through your PATH to find the right python > interpreter to run. The second one is hard-wired to run /usr/bin/python. > > If you only have a single copy of python installed, it doesn't really > matter which you use. But, you might as well get into the habit of > using the /usr/bin/env flavor because it's more flexible. Not just flexible but portable. On various systems I have Python in /usr/bin, /usr/local/bin and /usr/pkg/bin. "#!/usr/bin/env python" finds it in each case so I only need one version of the script. -- D'Arcy J.M. Cain | Democracy is three wolves http://www.druid.net/darcy/| and a sheep voting on +1 416 425 1212 (DoD#0082)(eNTP) | what's for dinner. IM: da...@vex.net -- http://mail.python.org/mailman/listinfo/python-list
Re: How to investigate web script not running?
On Fri, 28 Sep 2012 14:16:22 +0200, "Michael Ross" wrote: >Do it the other way around: > ># cgitb before anything else >import cgitb >cgitb.enable() > ># so this error will be caught > from fcgi import WSGIServer Thanks much for the tip. The error isn't displayed when calling the script from a web browser but it is when running the script on a shell account. It looks like that newer version of fcgi.py doesn't include support for WSGI, and I need some extra (Flup?) software to sit between mod_fcgid and a WSGI Python application. Definitely not plug 'n play :-/ -- http://mail.python.org/mailman/listinfo/python-list
Re: "#!/usr/bin/env python" vs. "#!/usr/bin/python"?
On Fri, 28 Sep 2012 09:19:54 -0400, D'Arcy Cain wrote: >Not just flexible but portable. On various systems I have Python >in /usr/bin, /usr/local/bin and /usr/pkg/bin. "#!/usr/bin/env python" >finds it in each case so I only need one version of the script. Good to know. -- http://mail.python.org/mailman/listinfo/python-list
Re: "#!/usr/bin/env python" vs. "#!/usr/bin/python"?
On 12-09-28 06:19 AM, D'Arcy Cain wrote: Not just flexible but portable. On various systems I have Python in /usr/bin, /usr/local/bin and /usr/pkg/bin. "#!/usr/bin/env python" finds it in each case so I only need one version of the script. +1. This also resolves correctly on Cygwin, even if Python is installed via Windows installers (as long as it's on system PATH). Tremendously useful if you're bouncing between *nix and Windows regularly. -- Demian Brecht @demianbrecht http://demianbrecht.github.com -- http://mail.python.org/mailman/listinfo/python-list
Re: REST code-golf: How concisely can you expose and consume services?
(A little OT so my apologies up front) On 12-09-28 12:39 AM, Chris Angelico wrote: I love the idea, even though I shan't be entering. Code golf is awesome fun! Code golf is indeed awesome fun and I usually enjoy taking part as well. However, I'm not a fan of code golf such as this, that uses a framework and then defines a rule that you *can't* hack on the same framework. In the framework/external module spirit, I *could* write a module that does *all* of this for me (in Pyramid, Django, web2py, etc) and then enter with a simple method call in another module. Done. One liner. I win ;) I much prefer code golf that tests algorithmic/core language feature knowledge. Of course, that's entirely only my opinion. -- Demian Brecht @demianbrecht http://demianbrecht.github.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
kl. 13:57:14 UTC+2 fredag 28. september 2012 skrev Jayden følgende: > Dear All, I have a concern in developing commercial code with Python. Someone > told me that its program can be easily hacked to get its source code. Is it > really the case? Any way to protect your source code? Thanks a lot! Jayden Python bytecode is not easier to hack than Java or .NET bytecodes. You don't have to distribute your source code. Dropbox and BitTorrent are written in Python. I don't think "hacking the source" is a major problem. You also have the option of compiling parts of the source code to native C DLLs using Cython. If you are very paranoid about protecting your sources, perhaps you shouldn't distribute it at all, but provide a web application? Sturla -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
On Fri, Sep 28, 2012 at 10:18 AM, wrote: > Python bytecode is not easier to hack than Java or .NET bytecodes. This is true, but both java and .net are also relatively easy to decompile. In general though, why does it matter? What are you trying to protect yourself against? If you're including secrets in your code like encryption keys or bank account numbers, there's no way to keep them out of the hands of a determined attacker that has access to your file, no matter what language it may be written in. If you must keep anyone from ever seeing how your code works, the only way to do that is to keep all the sensitive bits running on a machine that you control. Typically, you would do that by distributing a client portion of your application, and also running a web service. Then you can have your client connect to the web service, request that the sensitive calculations, or money transfer, or whatever, be done on the server, and just pass back the results. -- Jerry -- http://mail.python.org/mailman/listinfo/python-list
howto handle nested for
I know this should be a fairly basic question, but I'm drawing a blank. I have code that looks like: for s0 in xrange (n_syms): for s1 in xrange (n_syms): for s2 in xrange (n_syms): for s3 in xrange (n_syms): for s4 in range (n_syms): for s5 in range (n_syms): Now I need the level of nesting to vary dynamically. (e.g., maybe I need to add for s6 in range (n_syms)) Smells like a candidate for recursion. Also sounds like a use for yield. Any suggestions? -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On Fri, 28 Sep 2012 10:39:32 -0400, Neal Becker wrote: > I know this should be a fairly basic question, but I'm drawing a blank. > > I have code that looks like: > > for s0 in xrange (n_syms): > for s1 in xrange (n_syms): > for s2 in xrange (n_syms): > for s3 in xrange (n_syms): > for s4 in range (n_syms): > for s5 in range (n_syms): > > Now I need the level of nesting to vary dynamically. (e.g., maybe I > need to add for s6 in range (n_syms)) > > Smells like a candidate for recursion. Also sounds like a use for > yield. Any suggestions? It definitely looks like for is the wrong way to go for this without more information on the reason why it is difficult to say what the correct approach would be -- Calm down, it's *only* ones and zeroes. -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
W dniu 2012-09-28 16:42, Alister pisze: On Fri, 28 Sep 2012 10:39:32 -0400, Neal Becker wrote: I know this should be a fairly basic question, but I'm drawing a blank. I have code that looks like: for s0 in xrange (n_syms): for s1 in xrange (n_syms): for s2 in xrange (n_syms): for s3 in xrange (n_syms): for s4 in range (n_syms): for s5 in range (n_syms): Now I need the level of nesting to vary dynamically. (e.g., maybe I need to add for s6 in range (n_syms)) Smells like a candidate for recursion. Also sounds like a use for yield. Any suggestions? It definitely looks like for is the wrong way to go for this without more information on the reason why it is difficult to say what the correct approach would be it's well described in head first: python book ;) check this sources from this book http://www.headfirstlabs.com/books/hfpython/code/chapter1.zip hope it helps, regards -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On Sat, Sep 29, 2012 at 12:31 AM, Dennis Lee Bieber wrote: > On Fri, 28 Sep 2012 14:37:21 +1000, Chris Angelico > declaimed the following in gmane.comp.python.general: > > >> For further details, poke around on the web; I'm sure you'll find >> plenty of good blog posts etc. But as for me and my house, we will >> have Postgres serve us. >> > > Please, at least use the proper name... "Postgres" is a non-SQL > database inspired by Ingres. "PostgreSQL" is Postgres with an SQL query > engine. http://www.postgresql.org/docs/9.1/static/history.html "Many people continue to refer to PostgreSQL as "Postgres" (now rarely in all capital letters) because of tradition or because it is easier to pronounce. This usage is widely accepted as a nickname or alias." There's lots of internal documentation that references "Postgres". I don't see it as that big a deal. > On my side... I have MySQL running on my desktop. When I started, > MySQL had a native build that would run on Win9X; PostgreSQL at the time > required installing a Cygwin environment. > > MySQL v5 has improved a lot from those days (v3)... It now supports > stored procedures, triggers, a form of views, and prepared statements > (though MySQLdb is still pre v5 and sends completely formatted string > queries). They've even added GIS capabilities. (And then there is the > "drop-in" replacement for MySQL -- MariaDB: > http://kb.askmonty.org/en/mariadb-vs-mysql-compatibility/ ) Yes, MySQL has definitely improved. There was a time when its unreliability applied to all your data too, but now you can just click in InnoDB and have mostly-real transaction support etc. But there's still a lot of work that by requirement happens outside of transactions - MySQL doesn't let you roll back DDL, for instance. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On 2012-09-28 16:39, Neal Becker wrote: I know this should be a fairly basic question, but I'm drawing a blank. I have code that looks like: for s0 in xrange (n_syms): for s1 in xrange (n_syms): for s2 in xrange (n_syms): for s3 in xrange (n_syms): for s4 in range (n_syms): for s5 in range (n_syms): Now I need the level of nesting to vary dynamically. (e.g., maybe I need to add for s6 in range (n_syms)) Smells like a candidate for recursion. Also sounds like a use for yield. Any suggestions? In your example, it seem that the iterable of the for loop is always the same: range(n_sysms). It seems to be a number. Is that true? If that is so, then here is something useful: import copy class MultiLevelIterator(object): def __init__(self,levels,n): assert(levels>0) assert(n>0) self.levels = levels self.values = [0]*levels self.n = n def __iter__(self): return self def next(self): res = copy.copy(self.values) idx = self.levels-1 while idx>=0: self.values[idx]+=1 if self.values[idx]>=self.n: self.values[idx] = 0 idx-=1 else: return res raise StopIteration i = MultiLevelIterator(2,3) for values in i: print values This will print: [0, 0] [0, 1] [0, 2] [1, 0] [1, 1] [1, 2] [2, 0] [2, 1] -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change'
On Fri, Sep 28, 2012 at 11:12 PM, 陈伟 wrote: > > -- > http://mail.python.org/mailman/listinfo/python-list In future, can you put the body of your message into the body please? :) ctime is creation time, not change time. mtime is modification time, as you have. But I can understand where the confusion comes from; Google tells me there've been documentation bugs involving this very thing (and Google, being extremely Lawful Neutral, would have happily told you the same thing if you'd asked). ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On Fri, Sep 28, 2012 at 8:58 AM, Chris Angelico wrote: > Yes, MySQL has definitely improved. There was a time when its > unreliability applied to all your data too, but now you can just click > in InnoDB and have mostly-real transaction support etc. But there's > still a lot of work that by requirement happens outside of > transactions - MySQL doesn't let you roll back DDL, for instance. Neither does Oracle, for that matter. I don't really see any reason why DDL *should* be transactional in nature. If your web app is issuing DDL statements, then you're probably doing something wrong. -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change'
Am 28.09.2012 17:07, schrieb Chris Angelico: > On Fri, Sep 28, 2012 at 11:12 PM, 陈伟 wrote: >> >> -- >> http://mail.python.org/mailman/listinfo/python-list > > In future, can you put the body of your message into the body please? :) > > ctime is creation time, not change time. mtime is modification time, > as you have. But I can understand where the confusion comes from; > Google tells me there've been documentation bugs involving this very > thing (and Google, being extremely Lawful Neutral, would have happily > told you the same thing if you'd asked). In the future please read the manual before replying! ;) You are wrong, ctime is *not* the creation time. It's the change time of the inode. It's updated whenever the inode is modified, e.g. metadata modifications like permission changes, link/unlink of hard links etc. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
kl. 16:38:10 UTC+2 fredag 28. september 2012 skrev Jerry Hill følgende: > This is true, but both java and .net are also relatively easy to decompile. Neither of them are very "obfuscated". > In general though, why does it matter? Paranoia among managers? > What are you trying to protect yourself against? Embarassment? Patent trolls? Unauthorized access to priviledged features? Industrial espionage? > If you must keep anyone from ever seeing how your code works, the only way to > do that is to keep all the sensitive bits running on a machine that you > control. Indeed :) Sturla -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On Sat, Sep 29, 2012 at 1:14 AM, Ian Kelly wrote: > On Fri, Sep 28, 2012 at 8:58 AM, Chris Angelico wrote: >> Yes, MySQL has definitely improved. There was a time when its >> unreliability applied to all your data too, but now you can just click >> in InnoDB and have mostly-real transaction support etc. But there's >> still a lot of work that by requirement happens outside of >> transactions - MySQL doesn't let you roll back DDL, for instance. > > Neither does Oracle, for that matter. I don't really see any reason > why DDL *should* be transactional in nature. If your web app is > issuing DDL statements, then you're probably doing something wrong. I have an auto-update script that ensures that our database is at the correct patchlevel. It's fairly straight-forward: switch on patchlevel, execute the statements required to get up to the next one, at the bottom record the patchlevel in the database. (This relieves us of issues of schema changes done in development that didn't get pushed to production, for instance; our source code repository has _everything_ needed.) If anything goes wrong, Postgres will roll the transaction back. It doesn't matter if the first statement added a column to a table and the second does an INSERT... SELECT; they both get rolled back (as would any change to the patchlevel field, though that happens at the very end so it's not significant here). I can guarantee that the patch has either been completely applied or completely rolled back - exactly what transactions are for. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change'
On Sat, Sep 29, 2012 at 1:18 AM, Christian Heimes wrote: > Am 28.09.2012 17:07, schrieb Chris Angelico: > In the future please read the manual before replying! ;) You are wrong, > ctime is *not* the creation time. It's the change time of the inode. > It's updated whenever the inode is modified, e.g. metadata modifications > like permission changes, link/unlink of hard links etc. Whoops, my bad! Sorry. I was remembering some other APIs with similar terminology. Lesson: Check the docs, they're more reliable. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On 09/28/12 09:39, Neal Becker wrote: > I know this should be a fairly basic question, but I'm drawing a blank. > > I have code that looks like: > > for s0 in xrange (n_syms): > for s1 in xrange (n_syms): > for s2 in xrange (n_syms): > for s3 in xrange (n_syms): > for s4 in range (n_syms): > for s5 in range (n_syms): > > Now I need the level of nesting to vary dynamically. (e.g., maybe I need to > add > for s6 in range (n_syms)) > > Smells like a candidate for recursion. Also sounds like a use for yield. > Any > suggestions? There was a good discussion on this back in 2008 that might be worth reading over. For some reason the mail.python.org archives[1] seem to have broken threading on this topic (Andrew Reedick's reply using exec() is waaay down in the archive, disassociated from the thread), so here it is archived somewhere else where the 2 pages of threading seems more manageable/accurate: http://www.velocityreviews.com/forums/t585147-creating-unique-combinations-from-lists.html -tkc [1] http://mail.python.org/pipermail/python-list/2008-January/487851.html -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On Fri, Sep 28, 2012 at 8:39 AM, Neal Becker wrote: > I know this should be a fairly basic question, but I'm drawing a blank. > > I have code that looks like: > > for s0 in xrange (n_syms): > for s1 in xrange (n_syms): > for s2 in xrange (n_syms): > for s3 in xrange (n_syms): > for s4 in range (n_syms): > for s5 in range (n_syms): > > Now I need the level of nesting to vary dynamically. (e.g., maybe I need to > add > for s6 in range (n_syms)) > > Smells like a candidate for recursion. Also sounds like a use for yield. Any > suggestions? levels = 6 for combination in itertools.product(xrange(n_syms), levels): # do stuff Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
Neal Becker wrote: > I know this should be a fairly basic question, but I'm drawing a blank. > > I have code that looks like: > > for s0 in xrange (n_syms): > for s1 in xrange (n_syms): > for s2 in xrange (n_syms): > for s3 in xrange (n_syms): > for s4 in range (n_syms): > for s5 in range (n_syms): > > Now I need the level of nesting to vary dynamically. (e.g., maybe I need to > add > for s6 in range (n_syms)) > > Smells like a candidate for recursion. Also sounds like a use for yield. Any > suggestions? Thanks for the suggestions: I found itertools.product is just great for this. -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On 09/27/2012 10:37 PM, Chris Angelico wrote:>[...] > * MySQL is designed for dynamic web sites, with lots of reading and > not too much writing. Its row and table locking system is pretty > rudimentary, and it's quite easy for performance to suffer really > badly if you don't think about it. But if your needs are simple, MySQL > is probably enough. PostgreSQL uses MVCC to avoid locks in many cases. > You can happily read from a row while it's being updated; you'll be > unaware of the update until it's committed. MVCC comes with a cost though, as anyone who has ever needed to do a SELECT COUNT(*) on a large Postgresql table knows. >[...] > * Both engines have good support in popular languages, including > (dragging this back on topic, kicking and screaming) Python. Maybe things are different now but a few years ago I was trying to choose between Postgresql and Mysql about the time Python 2.4 (I think) was released. After waiting for over a year for the Python mysql dbi module to be released for the then current version of Python (I needed a binary for Windows) I finally gave up and decided to go with Postgresql (the psycopg2 module was available a very short time after the new Python was.) -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
Neal Becker wrote: > I know this should be a fairly basic question, but I'm drawing a blank. > > I have code that looks like: > > for s0 in xrange (n_syms): > for s1 in xrange (n_syms): > for s2 in xrange (n_syms): > for s3 in xrange (n_syms): > for s4 in range (n_syms): > for s5 in range (n_syms): > > Now I need the level of nesting to vary dynamically. (e.g., maybe I need > to add > for s6 in range (n_syms)) > > Smells like a candidate for recursion. Also sounds like a use for yield. > Any suggestions? for s in itertools.product(range(n_syms), repeat=6): print s -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
On 9/28/2012 9:19 AM, stu...@molden.no wrote: kl. 16:38:10 UTC+2 fredag 28. september 2012 skrev Jerry Hill følgende: This is true, but both java and .net are also relatively easy to decompile. Neither of them are very "obfuscated". In general though, why does it matter? Paranoia among managers? What are you trying to protect yourself against? Embarassment? Patent trolls? Unauthorized access to priviledged features? Industrial espionage? Sounds like a web solution is the best way. Use a thin client and run your NSA-level code on a server. It's worth pointing out though that even c/c++ isn't free. If someone wants to decompile or disassemble your code bad enough, it's going to happen. If you must keep anyone from ever seeing how your code works, the only way to do that is to keep all the sensitive bits running on a machine that you control. Indeed :) Sturla -- Take care, Ty http://tds-solutions.net The aspen project: a barebones light-weight mud engine: http://code.google.com/p/aspenmud He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave. -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On Sep 28, 2012 9:49 AM, "Ian Kelly" wrote: > levels = 6 > for combination in itertools.product(xrange(n_syms), levels): > # do stuff Sorry, that should have read "product(xrange(n_syms), repeat=levels)". The repeat argument is keyword-only. -- http://mail.python.org/mailman/listinfo/python-list
How to get progress in python script.
Hi all, Please, I need you suggest me a way to get statistics about a progress of my python script. My python script could take a lot of time processing a file, so I need a way that an external program check the progress of the script. My first idea was that the python script write a temp file showing the progress and the external program can check that file, but I think might happen file read/write locking issues. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: REST code-golf: How concisely can you expose and consume services?
On Sat, Sep 29, 2012 at 12:17 AM, Demian Brecht wrote: > (A little OT so my apologies up front) > > > On 12-09-28 12:39 AM, Chris Angelico wrote: >> >> I love the idea, even though I shan't be entering. Code golf is awesome >> fun! > > > Code golf is indeed awesome fun and I usually enjoy taking part as well. > However, I'm not a fan of code golf such as this, that uses a framework and > then defines a rule that you *can't* hack on the same framework. > > In the framework/external module spirit, I *could* write a module that does > *all* of this for me (in Pyramid, Django, web2py, etc) and then enter with a > simple method call in another module. > > Done. One liner. I win ;) > > I much prefer code golf that tests algorithmic/core language feature > knowledge. Of course, that's entirely only my opinion. > > -- > Demian Brecht > @demianbrecht > http://demianbrecht.github.com > -- > http://mail.python.org/mailman/listinfo/python-list Well I suppose I could lax that same requirement. I.e.: if you can get these decorators (also working with RBAC) in, for example: Django; then it still satisfied the rules :) -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get progress in python script.
In =?ISO-8859-1?Q?Rolando_Ca=F1er_Roblejo?= writes: > Hi all, > Please, I need you suggest me a way to get statistics about a progress > of my python script. My python script could take a lot of time > processing a file, so I need a way that an external program check the > progress of the script. My first idea was that the python script write a > temp file showing the progress and the external program can check that > file, but I think might happen file read/write locking issues. The external program should open the progress file for read only, so I wouldn't think file locking would be an issue. -- John Gordon A is for Amy, who fell down the stairs gor...@panix.com B is for Basil, assaulted by bears -- Edward Gorey, "The Gashlycrumb Tinies" -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get progress in python script.
- Original Message - > Hi all, > > Please, I need you suggest me a way to get statistics about a > progress > of my python script. My python script could take a lot of time > processing a file, so I need a way that an external program check the > progress of the script. My first idea was that the python script > write a > temp file showing the progress and the external program can check > that > file, but I think might happen file read/write locking issues. > > Thanks. > -- > http://mail.python.org/mailman/listinfo/python-list > Hello, One easy way would be to use a RPC system. Pyro implements one of them. See http://packages.python.org/Pyro4/tutorials.html This could be achieved in very few lines. Your script create a thread in which it serves the remote requests. xmlrpclib is another popular RPC package. Another solution is to use a web server (sounds overkill but it isn't). A lot of python web frameworks allow you to create such server in very few lines. look at http://www.cherrypy.org/ for instance, use their 'hello word' example and replace the 'hello word' by the current script progress and you're done. JM -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change'
On Fri, 28 Sep 2012 06:12:35 -0700, 陈伟 wrote: > what is the difference between st_ctime and st_mtime one is the time of > last change and the other is the time of last modification, but i can > not understand what is the difference between 'change' and 'modification'. st_mtime is updated when the file's contents change. st_ctime is updated when the file's metadata (owner, group, permissions, link count, etc) changes. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python source code easy to hack?
Jayden於 2012年9月28日星期五UTC+8下午7時57分14秒寫道： > Dear All, > > > > I have a concern in developing commercial code with Python. Someone told me > that its program can be easily hacked to get its source code. Is it really > the case? Any way to protect your source code? > > > > Thanks a lot! > > > > Jayden Nowadays high priced commercial IDE software products shipped with a built in interpreter with some GUI to let users customize their own needs in designs. This also means examples in source codes to be provided, too. Anyway even compiled instructions can be iced and reverse engineered for all the flows of the software. -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the difference between st_ctime and st_mtime one is the time of last change and the other is the time of last modification, but i can not understand what is the difference between 'change'
The Windows stat() call treats things differently, FROM: http://msdn.microsoft.com/en-us/library/14h5k7ff%28v=vs.80%29.aspx st_ctime Time of creation of file. Valid on NTFS but not on FAT formatted disk drives. I don't think that Windows has a concept of a "change time" for meta data (though that would be nice). How's that for compatibility ;) NOTE: I am a C programmer and new to python, so can anyone comment on what the st_ctime value is when os.stat() is called on Windows? Kris On 9/28/12 9:25 AM, Chris Angelico wrote: On Sat, Sep 29, 2012 at 1:18 AM, Christian Heimes wrote: Am 28.09.2012 17:07, schrieb Chris Angelico: In the future please read the manual before replying! ;) You are wrong, ctime is *not* the creation time. It's the change time of the inode. It's updated whenever the inode is modified, e.g. metadata modifications like permission changes, link/unlink of hard links etc. Whoops, my bad! Sorry. I was remembering some other APIs with similar terminology. Lesson: Check the docs, they're more reliable. ChrisA -- This message is NOT encrypted Mr. Kristen J. Webb Chief Technology Officer Teradactyl LLC. 2301 Yale Blvd. SE. Suite C7 Albuquerque, NM 87106 Phone: 1-505-338-6000 Email: kw...@teradactyl.com Web: http://www.teradactyl.com Home of the True incremental Backup System NOTICE TO RECIPIENTS: Any information contained in or attached to this message is intended solely for the use of the intended recipient(s). If you are not the intended recipient of this transmittal, you are hereby notified that you received this transmittal in error, and we request that you please delete and destroy all copies and attachments in your possession, notify the sender that you have received this communication in error, and note that any review or dissemination of, or the taking of any action in reliance on, this communication is expressly prohibited. Regular internet e-mail transmission cannot be guaranteed to be secure or error-free. Therefore, we do not represent that this information is complete or accurate, and it should not be relied upon as such. If you prefer to communicate with Teradactyl LLC. using secure (i.e., encrypted and/or digitally signed) e-mail transmission, please notify the sender. Otherwise, you will be deemed to have consented to communicate with Teradactyl via regular internet e-mail transmission. Please note that Teradactyl reserves the right to intercept, monitor, and retain all e-mail messages (including secure e-mail messages) sent to or from its systems as permitted by applicable law. -- http://mail.python.org/mailman/listinfo/python-list
RE: data attributes override method attributes?
Terry Reedy wrote: > On 9/25/2012 4:07 PM, Ian Kelly wrote: > > On Tue, Sep 25, 2012 at 1:58 PM, Terry Reedy wrote: > >> On 9/25/2012 11:03 AM, Chris Angelico wrote: > >>> Instance attributes override (shadow) class attributes. > >> > >> > >> except for (some? all?) special methods > > > > Those names are shadowed too. If you call foo.__len__() and the name > > is bound on the instance, it will call that function preferentially. > > It's just that when the special Python machinery calls the method, it > > skips the instance and goes straight to the class. > > I added "Ian Kelly reminds me that instance.__xxx__ is only skipped by > the internal machinery and not by direct accesses in user code. In the > other hand, docs, official or otherwise, are filled with things like > 'len(a) calls a.__len__', so I think something should be said that > giving instances special method attributes does not have the effect one > might expect." > > to the issue. > Just to make sure I am following, if you call foo.__len__() it goes to the instance code while if you do len(foo) it will go to class.__len__()? If so, why? This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. -- http://mail.python.org/mailman/listinfo/python-list
RE: regular expression : the dollar sign ($) work with re.match() or re.search() ？
iMath wrote:
> Sent: Wednesday, September 26, 2012 2:39 AM
> To: python-list@python.org
> Subject: regular expression : the dollar sign ($) work with re.match() or
> re.search() ？
>
> I only know the dollar sign ($) will match a pattern from the
> end of a string,but which method does it work with ,re.match() or re.search()
> ？
You can try this on the interactive interpreter.
>>> re.match('hi$', 'xihi')
>>> re.search('hi$', 'xihi')
<_sre.SRE_Match object at 0x13FF7100>
Although, I think match does not work since match
only starts searching at the start of the string
while search looks for the pattern anywhere in the string.
>>> re.match('x.hi$', 'xihi')
<_sre.SRE_Match object at 0x15693BF0>
I guess you can consider re.match's pattern to be
prefixed with '^'.
This email is confidential and subject to important disclaimers and
conditions including on offers for the purchase or sale of
securities, accuracy and completeness of information, viruses,
confidentiality, legal privilege, and legal entity disclaimers,
available at http://www.jpmorgan.com/pages/disclosures/email.
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Re: data attributes override method attributes?
On Fri, Sep 28, 2012 at 12:02 PM, Prasad, Ramit wrote: > Just to make sure I am following, if you call > foo.__len__() it goes to the instance code while > if you do len(foo) it will go to class.__len__()? Yes: >>> class Foo(object): ... def __len__(self): ... return 42 ... >>> foo = Foo() >>> foo.__len__ = lambda: 43 >>> foo.__len__() 43 >>> len(foo) 42 > If so, why? In the first case, "foo.__len__" just does the normal attribute lookup for the class. Instance attributes shadow class attributes, so the instance attribute is returned and then called. In the second case, "len(foo)" is implemented by a method in a prescribed location: foo.__class__.__len__. It only looks in the class for efficiency and because that is what the class object is for: to define how its instances behave. -- http://mail.python.org/mailman/listinfo/python-list
Re: data attributes override method attributes?
On 9/28/2012 2:02 PM, Prasad, Ramit wrote: Just to make sure I am following, if you call foo.__len__() it goes to the instance code while if you do len(foo) it will go to class.__len__()? len(foo) calls someclass.__len__(foo) where someclass is foo.__class__or some superclass. If so, why? Efficiency and perhaps simpler implementation, especially for binary ops. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: regular expression : the dollar sign ($) work with re.match() or re.search() ？
On Fri, Sep 28, 2012 at 12:07 PM, Prasad, Ramit
wrote:
> I guess you can consider re.match's pattern to be
> prefixed with '^'.
You can in this case, but they're not equivalent in multi-line mode:
>>> re.match('^two', 'one\ntwo', re.M)
>>> re.search('^two', 'one\ntwo', re.M)
<_sre.SRE_Match object at 0x0475BFA8>
--
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print or write on a text file ?
Hi ! Here is Python 3.3 Is it better in any way to use print(x,x,x,file='out') or out.write(x) ? Any reason to prefer any of them ? There should be a printlines, like readlines ? Thanks, franck -- http://mail.python.org/mailman/listinfo/python-list
Re: Article on the future of Python
On Thu, Sep 27, 2012 at 8:59 PM, alex23 wrote: > On Sep 28, 2:17 am, Devin Jeanpierre wrote: >> Uncharitably, it's just a way of hiding one's head in the sand, >> ignoring any problems Python has by focusing on what problems it >> doesn't have. > > But isn't that what counterpoint is all about? Actually I think it's about the charitable interpretation. Nobody writes an article and says, "I'm going to stick my head in the sand". I do believe the article is trying to provide a counterweight to the gloomy mood set by the first. > Calvin's article > highlighted what he felt were areas that Python isn't successful, > while Tim McNamara's pointed out areas it was. Just because Python > isn't used much in commercial video games doesn't undermine the point > that it's heavily used in education and research. Absolutely. But also, vice versa -- just because Python is a wonderful language for education and research does not mean that its problems in commercial video games are not worth looking at. > Does Python _have_ to be a go-to tool in gaming for it to not be on > its death march? I don't think anyone is arguing it's on a death march, just that there are issues that we downplay but should address to keep a vibrant and diverse community. Or something. I'm pretty sure nobody thinks Python is on a death march. > Or more to the point: rather than just complain about it... It's not > like there aren't active communities that _are_ working in this area: > PyGame, pyglet, Kivy are all projects that can be contributed to. Haha, I wouldn't phrase it as "complaining". Of these, I have mixed feelings. For example, Calvin has concerns that Python isn't so good on mobile because battery usage (or some such thing). I have no experience on mobile development, so no comment there. I intend to use Kivy this weekend actually, so... Maybe this one is very promising! You didn't mention it, but for the browser issue there is PyJS... but we've all heard the issues that project has. Not sure if there are sane alternatives. Perhaps Silverlight? In all cases you end up with output that's rather large. I'm not sure how practical it is, in the end, to use Python. It may just be that the difference in productivity for common web tasks, is tiny enough that the difficulty of setting up an efficient python->JS toolchain is overwhelming. As for pygame and pyglet, and game development, well, those are things. That's a sort of frustrating response for a number of reasons, but I'll keep it to just one: Those have been around for a very long time, and are very stable (to the point where the infrequency of updates sometimes leads to questions as to whether they're even maintained (I think they are)). The situation for using Python for game development is virtually unchanged in the past several years, and it's been failing for the past several years, so these two projects can't fix it. If these are the best we have, barring additional argument we are going nowhere on this front. For what it's worth, I think there are much larger problems in the game development world than how well Python is faring. Open source projects for game development are few and of not-so-amazing quality. > I love using Python and will endeavour to do so wherever I can, but > it's always going to be the case that a language has strengths & > weaknesses that other languages lack. Absolutely! Python will never be perfect. There will always be paths we can take to improve it. And we should always seek to improve it, as long as we stand behind it as a good and useful language compared to the alternatives. On the other hand, I will not use Python "wherever I can". I will use it wherever it makes the most sense to use it. For example, I would write a first person shooter game in C# and Unity 3D, and I would write my AJAX website in Javascript. It's just easier for me that way. Why use Python if it makes my job harder? -- Devin -- http://mail.python.org/mailman/listinfo/python-list
RE: [python-list] python application file format
Benjamin Jessup wrote: > Hello all, > > What do people recommend for a file format for a python desktop > application? Data is complex with 100s/1000s of class instances, which > reference each other. > > Write the file with struct module? (Rebuild object pointers, safe, > compact, portable, not expandable without reserved space) > > Use cPickle with a module/class whitelist? (Can't easily port, not > entirely safe, compact enough, expandable) > > Use JSON or similar? (Rebuild object pointers, portable, expandable, size?) > > Any advice is greatly appreciated! I would think your options are pickle, json or database (either sqlite or something like Postgres). I am unfamiliar with the struct module so I cannot comment on its applicability. I would guess that your data would be best saved by using a sqlite database. Your biggest problem might be how the different classes are referencing each other. If you are using identifiers then any of these options will probably work. If you are using aggregation then I know that pickle will work (at least for built-in types). JSON will keep the structure but duplicate elements. >>> a = [ 1,2,3 ] >>> b = [ 'a', 'b', 'c' ] >>> a.append( b ) >>> e = [ a,b ] >>> s = json.dumps( e ) >>> eret = json.loads( s ) >>> id(eret[0][3]), id(eret[1]) # Same result for json and simplejson (329443808, 327677272) >>> eret[0][3].append( 'o') >>> eret[0][3], eret[1] ([u'a', u'b', u'c', 'o'], [u'a', u'b', u'c']) So pickle will be your easiest option, but I am not sure how well it will scale with a large number items. Using sqlite/db should scale well but it will take you longer/more effort to create a system for converting your objects to and from the DB. This email is confidential and subject to important disclaimers and conditions including on offers for the purchase or sale of securities, accuracy and completeness of information, viruses, confidentiality, legal privilege, and legal entity disclaimers, available at http://www.jpmorgan.com/pages/disclosures/email. -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On 2012-09-28, Laszlo Nagy wrote: > In your example, it seem that the iterable of the for loop is > always the same: range(n_sysms). It seems to be a number. Is > that true? If that is so, then here is something useful: > > import copy > > class MultiLevelIterator(object): > def __init__(self,levels,n): > assert(levels>0) > assert(n>0) > self.levels = levels > self.values = [0]*levels > self.n = n > > def __iter__(self): > return self > > def next(self): > res = copy.copy(self.values) > idx = self.levels-1 > while idx>=0: > self.values[idx]+=1 > if self.values[idx]>=self.n: > self.values[idx] = 0 > idx-=1 > else: > return res > raise StopIteration > > i = MultiLevelIterator(2,3) > for values in i: > print values > > This will print: > > [0, 0] > [0, 1] > [0, 2] > [1, 0] > [1, 1] > [1, 2] > [2, 0] > [2, 1] It looks like you might have missed the last one. Also, be sure to check itertools for occasionally for cool stuff like this. >>> for values in itertools.product(range(3), repeat=2): ... print(values) ... (0, 0) (0, 1) (0, 2) (1, 0) (1, 1) (1, 2) (2, 0) (2, 1) (2, 2) -- Neil Cerutti -- http://mail.python.org/mailman/listinfo/python-list
Re: print or write on a text file ?
On Fri, 28 Sep 2012, Franck Ditter wrote: Hi ! Here is Python 3.3 Is it better in any way to use print(x,x,x,file='out') or out.write(x) ? Any reason to prefer any of them ? There should be a printlines, like readlines ? Thanks, The print function automatically appends newlines to the end of what it prints. So if you had text = 'Hello!' and you did: print(text, file=outfile) then outfile would contain 'Hello!\n' In contrast, outfile.write(text) would only write 'Hello!'. No newline. There are lots of other handy things you can do with the print function: values = [1,2,3,4] print(*values, sep='\n', file=outfile) I'll leave it to you to experiment. HTH, Wayne -- http://mail.python.org/mailman/listinfo/python-list
How to pass FILE *
The function I am trying to call wants a FILE *: dlg_progressbox(const char *title, const char *cprompt, int height, int width, int pauseopt, FILE *fp) I can open the file to be referenced: fp = os.fdopen(self.pipefds[0], 'r') Every thing I've tried ends with ctypes raising a TypeError. -- Yonder nor sorghum stenches shut ladle gulls stopper torque wet strainers. --- -- Yonder nor sorghum stenches shut ladle gulls stopper torque wet strainers. -- http://mail.python.org/mailman/listinfo/python-list
[fcgi.py] Force cache upgrade?
Hello
Does someone know if something must be done after editing a FastCGI +
WSGI script so that the changes will show in the browser immediately
instead of having to wait X minutes?
===
#!/usr/bin/env python2.6
def myapp(environ, start_response):
start_response('200 OK', [('Content-Type', 'text/plain')])
return ['I CHANGED THIS\n']
if __name__ == '__main__':
from flup.server.fcgi import WSGIServer
WSGIServer(myapp).run()
===
I guess the FastCGI server (Flup) only updates its cache every so
often. Do I need to type a command to force Flup to recompile the
Python script?
Thank you.
--
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creating an artificial "last element" in sort list
a = ['a', 'b', x] b = sorted(a) What does x need to be to always be last on an ascending sort no matter what 'a' and 'b' are within reason... I am expecting 'a' and 'b' will be not longer than 10 char's long I tried making x = '' and believe it or not, this appears FIRST on the sort!!! -- http://mail.python.org/mailman/listinfo/python-list
Re: [fcgi.py] Force cache upgrade?
If you don't have access to restart Apache (or `x` server), then touch
fcgi.py *should* work.
On Fri, Sep 28, 2012 at 2:57 PM, Gilles wrote:
> Hello
>
> Does someone know if something must be done after editing a FastCGI +
> WSGI script so that the changes will show in the browser immediately
> instead of having to wait X minutes?
>
> ===
> #!/usr/bin/env python2.6
>
> def myapp(environ, start_response):
> start_response('200 OK', [('Content-Type', 'text/plain')])
> return ['I CHANGED THIS\n']
>
> if __name__ == '__main__':
> from flup.server.fcgi import WSGIServer
> WSGIServer(myapp).run()
> ===
>
> I guess the FastCGI server (Flup) only updates its cache every so
> often. Do I need to type a command to force Flup to recompile the
> Python script?
>
> Thank you.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
--
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Re: creating an artificial "last element" in sort list
On Fri, Sep 28, 2012 at 5:39 PM, dave wrote: > a = ['a', 'b', x] > > b = sorted(a) > > What does x need to be to always be last on an ascending sort no matter what > 'a' and 'b' are within reason... I am expecting 'a' and 'b' will be not > longer than 10 char's long I tried making x = '' and > believe it or not, this appears FIRST on the sort!!! It appears last when I run the code. To answer your question, though, if you want to force x to be last, then I suggest removing it from the list and then appending it to the end. -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
more clearer, this is a more realistic use case: ['awefawef', 'awefawfsf', 'awefsdf', 'zz', 'zz', 'zz'] and the quantity of ''zz'' would be dynamic. On Friday, September 28, 2012 4:46:15 PM UTC-7, Ian wrote: > > > a = ['a', 'b', x] > > > > > > b = sorted(a) > > > > > > What does x need to be to always be last on an ascending sort no matter > > what 'a' and 'b' are within reason... I am expecting 'a' and 'b' will > > be not longer than 10 char's long I tried making x = '' > > and believe it or not, this appears FIRST on the sort!!! > > > > It appears last when I run the code. > > > > To answer your question, though, if you want to force x to be last, > > then I suggest removing it from the list and then appending it to the > > end. -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
Maybe l = filter(a, lambda v: v == a[-1]) sorted(a[:-len(l)]) + l ? On Fri, Sep 28, 2012 at 4:51 PM, dave wrote: > more clearer, this is a more realistic use case: > > ['awefawef', 'awefawfsf', 'awefsdf', 'zz', 'zz', > 'zz'] > > and the quantity of ''zz'' would be dynamic. > > On Friday, September 28, 2012 4:46:15 PM UTC-7, Ian wrote: > > > > > > a = ['a', 'b', x] > > > > > > > > > > b = sorted(a) > > > > > > > > > > What does x need to be to always be last on an ascending sort no > matter what 'a' and 'b' are within reason... I am expecting 'a' and 'b' > will be not longer than 10 char's long I tried making x = > '' and believe it or not, this appears FIRST on the sort!!! > > > > > > > > It appears last when I run the code. > > > > > > > > To answer your question, though, if you want to force x to be last, > > > > then I suggest removing it from the list and then appending it to the > > > > end. > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
Re: [fcgi.py] Force cache upgrade?
On Fri, 28 Sep 2012 23:57:14 +0200, Gilles wrote: >I guess the FastCGI server (Flup) only updates its cache every so >often. Do I need to type a command to force Flup to recompile the >Python script? Turns out that, yes, mod_fcgid is configured to reload a script only after some time or some number of hits, and yes, mod_fcgid settings are off-limit on a shared host. -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
dave於 2012年9月29日星期六UTC+8上午7時51分10秒寫道： > more clearer, this is a more realistic use case: > > > > ['awefawef', 'awefawfsf', 'awefsdf', 'zz', 'zz', > 'zz'] > > > > and the quantity of ''zz'' would be dynamic. > > > > On Friday, September 28, 2012 4:46:15 PM UTC-7, Ian wrote: > > > > > > > > > a = ['a', 'b', x] > > > > > > > > > > > > > > b = sorted(a) > > > > > > > > > > > > > > What does x need to be to always be last on an ascending sort no matter > > > what 'a' and 'b' are within reason... I am expecting 'a' and 'b' will > > > be not longer than 10 char's long I tried making x = > > > '' and believe it or not, this appears FIRST on the > > > sort!!! > > > > > > > > > > > > It appears last when I run the code. > > > > > > > > > > > > To answer your question, though, if you want to force x to be last, > > > > > > then I suggest removing it from the list and then appending it to the > > > > > > end. I am thinking if it is helpful to preprocess an arbitrary list first into some set of unique ordered elements before a sort. Anyway lists are passed by references to functions in python. -- http://mail.python.org/mailman/listinfo/python-list
write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212. -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
Apparently gmail hates me and my last response didn't get through: a = ['awefawef', 'awefawfsf', 'awefsdf', 'zz', 'zz', 'zz'] f = filter(lambda s: s == a[-1], a) l = sorted(lst[:-len(f)]) + f Now, not 100% sure about efficiency over large sizes of a, but that's a naive stab at it anyway. -- Demian Brecht @demianbrecht http://demianbrecht.github.com -- http://mail.python.org/mailman/listinfo/python-list
Re: print or write on a text file ?
On 9/28/2012 2:42 PM, Franck Ditter wrote: Hi ! Here is Python 3.3 Is it better in any way to use print(x,x,x,file='out') or out.write(x) ? Any reason to prefer any of them ? print converts objects to strings and adds separators and terminators. If you have a string s and want to output it as is, out.write(s) is perhaps faster. It is 6 chars shorted than print(s, file=out). There should be a printlines, like readlines ? No, now that files are iterators, I believe readlines is somewhat obsolete. file.readlines() == list(file) The only reason not to deprecate it is for the hint parameter to limit the bytes read. That is little harder to do with the iterator. If you have any iterator of lines, for line in lines: line.print() is quite sufficient. There is little or no need for output limitation. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: how to run shell command like "<
于 2012-9-28 16:16, Kushal Kumaran 写道:
On Fri, Sep 28, 2012 at 1:15 PM, 叶佑群 wrote:
Hi, all,
I have the shell command like this:
sfdisk -uM /dev/sdb<< EOT
,1000,83
,,83
EOT
I have tried subprocess.Popen, pexpect.spawn and os.popen, but none of
these works, but when I type this shell command in shell, it is works fine.
I wonder how to emulate this type of behavior in python , and if someone can
figure out the reason why?
The sample code of subprocess.Popen is:
command = ["sfdisk", "-uM", target, "<
The "<
I tried this, but it is still not work.
and pexpect code is:
child = pexpect.spawn ("sfdisk -uM /dev/sdb<
--
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Re: how to run shell command like "<
于 2012-9-28 16:16, Kushal Kumaran 写道: On Fri, Sep 28, 2012 at 1:15 PM, 叶佑群 wrote: Hi, all, I have the shell command like this: sfdisk -uM /dev/sdb<< EOT ,1000,83 ,,83 EOT I have tried subprocess.Popen, pexpect.spawn and os.popen, but none of these works, but when I type this shell command in shell, it is works fine. I wonder how to emulate this type of behavior in python , and if someone can figure out the reason why? The sample code of subprocess.Popen is: command = ["sfdisk", "-uM", target, "< The "
Re: creating an artificial "last element" in sort list
> f = filter(lambda s: s == a[-1], a) That line's assuming that the last element may also be found in arbitrary locations in the list. If it's guaranteed that they're all contiguous at the upper bounds, I'd just walk the list backwards until I found one that wasn't matching rather than filtering. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reducing cache/buffer for faster display
On 2012-09-28, Dennis Lee Bieber wrote: > On Thu, 27 Sep 2012 22:25:39 + (UTC), John Gordon > declaimed the following in gmane.comp.python.general: > >> >> Isn't terminal output line-buffered? I don't understand why there would >> be an output delay. (Unless the "\r" is messing things up...) > > It's the trailing , The \r is being used to reset to the > beginning of the console line, but the comma "says" more output for > /this/ line will be coming... So no output until explicitly flushed, or > a new-line is issued. Well, the \r seems to be the problem, allright. But output was not completely blocked, just delayed a very long time. So perhaps flushing and a sending a newline aren't the only triggers for output. Perhaps there's a maximum delay or a maximum cumulated size, and the output is flushed when such a limit is reached. Anyway, that's mainly academic. I doubt there will be a correction to that behaviour. -- When in doubt, use brute force. -- Ken Thompson -- http://mail.python.org/mailman/listinfo/python-list
Re: Reducing cache/buffer for faster display
On 2012-09-28, Chris Angelico wrote: > On Fri, Sep 28, 2012 at 10:05 AM, Rikishi42 wrote: >> The scripts in question only increase numbers. But should that not be the >> case, solutions are simple enough. The numbers can be formatted to have a >> fixed size. In the case of random line contents (a list of filesnames, say) >> it's enough to create an output function that is aware of the length of the >> previously printed line, and add enough spaces to the current one to wipe >> exess content. > > Yep, that's a pretty effective way to do it. One simple method to it > is to format the whole string as a single whole, then left justify it > in a field of (say) 79 characters, and output that: > > msg = "Progress: %d%% (%d/%d)... %s" % (done*100/total, done, total, > current_file) > print msg.ljust(79)+"\r", > sys.stdout.flush() Mmm, I allmost went for that. It's elegant, simple and clear. But there's one drawback: I usually reduce the terminal's window to take up less desktop surface during those long runs. So fixing it to 79 chars won't do. And I'm not even tempted to go for a detection of the width of the terminal from within the script. The idea is after all to keep the scripts simple (syntax) and light (execution). Well, good night everyone. -- When in doubt, use brute force. -- Ken Thompson -- http://mail.python.org/mailman/listinfo/python-list
Re: howto handle nested for
On Fri, 28 Sep 2012 09:49:36 -0600, Ian Kelly wrote: > > levels = 6 > for combination in itertools.product(xrange(n_syms), levels): > # do stuff >>> n_syms = 3 >>> levels = 6 >>> for combination in itertools.product(xrange(n_syms), levels): ... print combination ... Traceback (most recent call last): File "", line 1, in TypeError: 'int' object is not iterable -- To email me, substitute nowhere->spamcop, invalid->net. -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
On 29/09/12 00:51, dave wrote: more clearer, this is a more realistic use case: ['awefawef', 'awefawfsf', 'awefsdf', 'zz', 'zz', 'zz'] and the quantity of ''zz'' would be dynamic. Maybe, class Greatest: def __lt__(self, other): return False def __eq__(self, other): return type(other) == type(self) etc. Duncan -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On 09/28/12 19:31, iMath wrote: > write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212. Okay, that was pretty easy. Thanks for the challenge :-) -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
dave writes: > What does x need to be to always be last on an ascending sort no > matter what 'a' and 'b' are within reason... Why are you trying to do that? It sounds ugly. Just sort the list with the a's and b's. If you absolutely have to, you could make a class with comparison methods that put all the x's at the bottom, but look for something cleaner. -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
iMath writes: > write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212. And then you have two problems. -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On 29/09/2012 02:35, Tim Chase wrote: On 09/28/12 19:31, iMath wrote: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212. Okay, that was pretty easy. Thanks for the challenge :-) -tkc What's the run time speed like? How much memory does it use? Shouldn't you be using the regex module from pypi instead of the standard library re? Guess who's borrowed the time machine? -- Cheers. Mark Lawrence. -- http://mail.python.org/mailman/listinfo/python-list
Re: QThread.terminate in Python 3
>> I understand that use of QThread.terminate is discouraged, >> but it has worked well previously and I would like to continue >> this use if possible. >> > And now you've encountered the reason it is discouraged. Ok. Point taken. What I hear you saying is that once I use .terminate anything following that is indeterminate. It might work on my system and nowhere else. Even though it was working for me before, it was likely causing trouble elsewhere. So, I need another approach. The problem I am facing is that I want to run arbitrary (user-supplied) code in the other thread and need to be able to stop it at any time. This is for a python turtle-graphics application: http://pynguin.googlecode.com/ I found another possible approach here: http://tomerfiliba.com/recipes/Thread2/ It uses ctypes to raise an exception in the other thread. For the simple test case, at least, it works (for me). Is this any safer or more reliable than .terminate ? Is it portable? ie, if I build this in to my actual application and it works for me, is it likely to work for everyone? Thanks for any insight. -- http://mail.python.org/mailman/listinfo/python-list
Re: creating an artificial "last element" in sort list
On Fri, 28 Sep 2012 16:39:33 -0700, dave wrote: > a = ['a', 'b', x] > b = sorted(a) > > What does x need to be to always be last on an ascending sort no matter > what 'a' and 'b' are within reason... How about this? a = ['a', 'b'] b = sorted(a) + ['whatever you want'] You could also do this: x = max(a) a.append(x) b = sorted(a) > I am expecting 'a' and 'b' > will be not longer than 10 char's long I tried making x = > '' and believe it or not, this appears FIRST on the > sort!!! I think you are mistaken. py> sorted(['a', 'b', '']) ['a', 'b', ''] But really, I don't understand what problem you are trying to solve. Perhaps if you explain the purpose of this, we can suggest a solution. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On 09/28/12 20:58, Mark Lawrence wrote: > On 29/09/2012 02:35, Tim Chase wrote: >> On 09/28/12 19:31, iMath wrote: >>> write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212. >> >> Okay, that was pretty easy. Thanks for the challenge :-) > > What's the run time speed like? O(1) r = re.compile( "800-555-1212|" "555-1212|" r"\(800\) 555-1212" ) (okay, so I also have one that solves the OP's underqualified problem, but without the OP at least *trying* to code up an answer and asking for help with it, I've give the snarky solution :-) > How much memory does it use? Insignificant. > Shouldn't you be using the regex module from pypi instead of the > standard library re? Only if the OP requested it ;-) > Guess who's borrowed the time machine? Neutrino! -tkc -- http://mail.python.org/mailman/listinfo/python-list
Missing library path (WIndows)
Hello -- I am running python from an application, starting it with a call to
the python31.dll
I think I am missing something in my path -- any help would be appreciated --
thanks
Here is the script and the output ---
# this is a test
import sys
print('hello from python')
print('Number of arguments:', len(sys.argv), 'arguments.')
print('Argument List:', str(sys.argv))
#--#
# o u t p u t #
#--#
Argument List: hello from python
Number of arguments: 5 arguments.
Traceback (most recent call last):
File "", line 1, in
File "C:/DOCUME~1/Frank/LOCALS~1/Temp/foo.py", line 10, in
print('Argument List:', str(sys.argv))
File "C:\Python32\Lib\encodings\cp437.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 2-18:
character maps to
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Re: Article on the future of Python
On Fri, 28 Sep 2012 14:50:14 -0400, Devin Jeanpierre wrote: > I'm pretty sure nobody thinks Python is on a death march. Don't be so sure. There's always *someone* complaining about something, and they're usually convinced that (Language X) is on it's last legs because (feature Y) is missing or (event Z) happened. Seriously. If you believe the haters and the complainers, Python will never be taken seriously as a language because: - it has significant whitespace. - it doesn't have braces. - it doesn't have static typing. - Python is too slow. - it has lost momentum to Ruby on RAILS. - it has lost momentum to Javascript. - it doesn't have a real garbage collector that can collect cycles. - oh, Python has had one of those for a decade? I meant a garbage collector that can collect cycles involving objects with __del__ methods. - threads aren't exactly like threads in some other language. - Python only uses a single core of the CPU. - I mean CPython. IronPython and Jython don't count. - I mean ordinary Python code, using multiprocessing doesn't count. - Neither do C extensions or numpy. - Python changes too fast. People can't keep up. Python should be an ISO standard managed by a committee, like C, with a guarantee that 30 year old code will run in the latest version. - Python changes too slow. People can't use all these great new features. It has gotten too big and the developers care too much about backward compatibility and aren't willing to delete cruft from the language. - you can't compile to native machine code. No language can possibly be successful with byte-code running in a virtual machine. - it isn't a pure object-oriented language exactly like Java. - you can't hide your source code from the end user. People will STEEEAL MY INTELLECTUUUALL PROPERTY!!! - oh, you can? Yeah, but it's too hard, and besides they might decompile the .pyc files. - Python 3 is a failure and has split the community. I think I've got all the most common reasons for dismissing Python. "Python has lost ground to Flash" is a new one for me, as is "Python ate my mobile phone's batteries". In a way, it's quite unfortunate that you can't write a blog post discussing weaknesses of a language (as opposed to strengths) without turning it into fuel for the haters: http://news.ycombinator.com/item?id=4567023 But when you give a blog post an inflammatory title like "I am worried about the future of Python", what do you expect? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: data attributes override method attributes?
On Fri, 28 Sep 2012 18:02:04 +, Prasad, Ramit wrote: > Just to make sure I am following, if you call foo.__len__() it goes to > the instance code while if you do len(foo) it will go to > class.__len__()? If you call foo.__len__, the attribute lookup of __len__ will use the exact same search path as foo.spam would use: 1) does __getattribute__ exist and intercept the call? 2) if not, does a instance attribute exist? 3) if not, does a class attribute exist? 4) if not, does a superclass attribute exist? 5) if not, does __getattr__ exist and intercept the call? Using len(foo) bypasses steps 1) and 2) as a speed optimization. For the common case where an instance's class directly defines a __len__ method, that saves about 10-15% of the overhead of calling a special method, compared to old-style classes. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On Fri, Sep 28, 2012 at 8:17 PM, Tim Chase
wrote:
> On 09/28/12 20:58, Mark Lawrence wrote:
>> On 29/09/2012 02:35, Tim Chase wrote:
>>> On 09/28/12 19:31, iMath wrote:
write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
>>>
>>> Okay, that was pretty easy. Thanks for the challenge :-)
>>
>> What's the run time speed like?
>
> O(1)
>
> r = re.compile(
> "800-555-1212|"
> "555-1212|"
>r"\(800\) 555-1212"
> )
Mine is simpler and faster.
r = re.compile("")
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Re: creating an artificial "last element" in sort list
On Fri, Sep 28, 2012 at 6:59 PM, Demian Brecht wrote: >> f = filter(lambda s: s == a[-1], a) > > That line's assuming that the last element may also be found in arbitrary > locations in the list. If it's guaranteed that they're all contiguous at the > upper bounds, I'd just walk the list backwards until I found one that wasn't > matching rather than filtering. The slicing operation in the second line assumes that they're all collected at the end of the list anyway. -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On Fri, 28 Sep 2012 21:25:35 -0600, Ian Kelly wrote:
> Mine is simpler and faster.
>
> r = re.compile("")
The OP doesn't say that you have to compile it, so just:
''
wins.
--
Steven
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Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On 09/28/12 22:25, Ian Kelly wrote:
> On Fri, Sep 28, 2012 at 8:17 PM, Tim Chase
On 09/28/12 19:31, iMath wrote:
> write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
>>
>> r = re.compile(
>> "800-555-1212|"
>> "555-1212|"
>>r"\(800\) 555-1212"
>> )
>
> Mine is simpler and faster.
>
> r = re.compile("")
doh! «smacks forehead» Yours is FAR more efficient, and much more
readable than mine. iMath's teacher will be pleased :-)
-tkc
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Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On 09/28/12 22:30, Steven D'Aprano wrote:
> On Fri, 28 Sep 2012 21:25:35 -0600, Ian Kelly wrote:
>
>> Mine is simpler and faster.
>>
>> r = re.compile("")
>
> The OP doesn't say that you have to compile it, so just:
>
> ''
>
> wins.
OP doesn't say it even has to be a string, so I guess
wins. :-P
It's-too-late-on-a-Friday-night'ly yers,
-tkc
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Re: creating an artificial "last element" in sort list
On Fri, Sep 28, 2012 at 8:29 PM, Ian Kelly wrote: > The slicing operation in the second line assumes that they're all > collected at the end of the list anyway. > True enough. Hadn't considered otherwise when I first whipped that off with the first example (thinking/trying it out *before* posting would likely be a good idea ;)). >>> a = ['z'*5, 'b', 'a', 'c', 'z'*5] >>> b = filter(lambda n: n == a[-1], a) >>> c = filter(lambda n: n != a[-1], a) >>> d = sorted(c) + b ['a', 'b', 'c', 'z', 'z'] It does the trick for what he was asking in the original question, although there are likely more optimal solutions for a sufficiently large a. As Steven noted, it definitely would help to get a little more information about the specific problem. -- http://mail.python.org/mailman/listinfo/python-list
Re: write a regex matches 800-555-1212, 555-1212, and also (800) 555-1212.
On Fri, Sep 28, 2012 at 9:58 PM, Mark Lawrence wrote: > What's the run time speed like? How much memory does it use? Shouldn't you > be using the regex module from pypi instead of the standard library re? > Guess who's borrowed the time machine? O(n), O(1), and I used RE2. -- Devin -- http://mail.python.org/mailman/listinfo/python-list
Re: How to pass FILE *
On Fri, Sep 28, 2012 at 2:55 PM, xDog Walker wrote: > > The function I am trying to call wants a FILE *: > > dlg_progressbox(const char *title, > const char *cprompt, > int height, > int width, > int pauseopt, > FILE *fp) > > I can open the file to be referenced: > > fp = os.fdopen(self.pipefds[0], 'r') > > Every thing I've tried ends with ctypes raising a TypeError. What specifically did you try? A tiny bit of googling suggests the following approach: http://stackoverflow.com/questions/3794309/python-ctypes-python-file-object-c-file/3794401#3794401 Related POSIX docs: http://pubs.opengroup.org/onlinepubs/009695399/functions/fdopen.html Cheers, Chris -- http://mail.python.org/mailman/listinfo/python-list
