[issue34823] libffi detection doesn’t work in my setup
Daniel Fetchinson added the comment: It seems there is a way to fix this: https://mail.python.org/pipermail/python-list/2018-December/738568.html LDFLAGS=`pkg-config --libs-only-L libffi` ./configure Would be nice to document this or make the build system find the libraries and headers in a simpler way. -- ___ Python tracker <https://bugs.python.org/issue34823> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34823] libffi detection doesn’t work in my setup
Daniel Fetchinson added the comment: I have the exact same issue, trying to compile 3.7.1 with a custom libffi location. Note that I must build libffi from source and can't install binaries provided by my distro, I believe this is the origin of the problem. Probably the python build system checks for libffi in some "standard" locations and it doesn't seem possible to use libffi from a custom location. This is where libffi gets installed after passing --prefix=$HOME/opt to ./configure: $HOME/opt/lib64/libffi.so.6.0.4 $HOME/opt/lib64/libffi.a $HOME/opt/lib64/libffi.la $HOME/opt/lib64/libffi.so.6 $HOME/opt/lib64/libffi.so $HOME/opt/lib/pkgconfig/libffi.pc $HOME/opt/lib/libffi-3.2.1/include/ffi.h $HOME/opt/lib/libffi-3.2.1/include/ffitarget.h $HOME/opt/share/info/libffi.info In any case, just to be sure, I've copied the header files to $HOME/opt/include/ffi.h $HOME/opt/include/ffitarget.h And pkg-config works: [fetch@fetch opt]$ pkg-config --libs libffi -L/home/fetch/opt/lib/../lib64 -lffi [fetch@fetch opt]$ pkg-config --cflags libffi -I/home/fetch/opt/lib/libffi-3.2.1/include These environment variables are also set: LD_LIBRARY_PATH=/home/fetch/opt/lib:/home/fetch/opt/lib64 C_INCLUDE_PATH=/home/fetch/opt/include And still _ctypes fails to build (but python itself (minus _ctypes) compiles successful and works perfectly well). -- nosy: +fetchinson __ Python tracker <https://bugs.python.org/issue34823> __ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue34823] libffi detection doesn’t work in my setup
Daniel Fetchinson added the comment: It would be really great if this could be sorted out because at the moment this bug prevents me from using numpy/scipy with python 3.7.1 (they need _ctypes). -- __ Python tracker <https://bugs.python.org/issue34823> __ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: New to python, do I need an IDE or is vim still good enough?
I'm new to python, got 10-20 years perl and C experience, all gained on unix alike machines hacking happily in vi, and later on in vim. Now it's python, and currently mainly on my kubuntu desktop. Welcome to the club! Do I really need a real IDE, as the windows guys around me say I do, or will vim, git, make and other standalone tools make it the next 20 years too for me? Sure they will! Oh, by the way, after 7 days I'm completely in love with this python thing. Again, welcome to the club! I should have made the switch much earlier! Indeed.. BTW, I also use vim only, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
pygnomevfs get_local_path_from_uri replacement
Hi folks, I realize this is slightly off topic and maybe belongs to a gnome email list but it's nevertheless python: I use an old python program that was written for gnome 2 and gtk 2 and uses the function get_local_path_from_uri. More specifically it uses gnomevfs.get_local_path_from_uri. Now with gnome 3 the module pygnomevfs does not exist anymore and after checking the source for pygnomevfs it turns out it's written in C using all the header files and stuff from gnome 2. So I can't just lift it from the source. I was hoping it's pure python in which case I could have simply lifted it. Does anyone know what a good replacement for get_local_path_from_uri is? Is there a gtk/gnome/etc related python package that contains it which would work with gnome 3? Or a totally gnome-independent python implementation? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: pygnomevfs get_local_path_from_uri replacement
Hi folks, I realize this is slightly off topic and maybe belongs to a gnome email list but it's nevertheless python: I use an old python program that was written for gnome 2 and gtk 2 and uses the function get_local_path_from_uri. More specifically it uses gnomevfs.get_local_path_from_uri. Now with gnome 3 the module pygnomevfs does not exist anymore and after checking the source for pygnomevfs it turns out it's written in C using all the header files and stuff from gnome 2. So I can't just lift it from the source. I was hoping it's pure python in which case I could have simply lifted it. Does anyone know what a good replacement for get_local_path_from_uri is? Is there a gtk/gnome/etc related python package that contains it which would work with gnome 3? Or a totally gnome-independent python implementation? The commit https://mail.gnome.org/archives/commits-list/2009-May/msg05733.html suggests that get_local_path_from_uri() might have been defined as (taking slight liberties): gnome_vfs_unescape_string(remove_host_from_uri(uri)) Assuming these functions do the obvious things implied by their names (you can probably chase down the Gnome VFS source or docs to check; I don't care enough to bother), given a general URI protocol://host/path, it presumably returns either protocol:///path (`protocol:` likely being file: in this case) or /path, in either case with `path` having been un-percent-escaped. The latter transform can be done using http://docs.python.org/2/library/urllib.html#urllib.unquote Alternately, you might call the Gnome VFS C API directly via http://docs.python.org/2/library/ctypes.html Thanks, ctypes is actually a great idea, I should have thought about that. In the meantime I use the simple function def get_local_path_from_uri( uri ): return uri.split( '//' )[1] and it seems to work. In the program the function is always called in a try: except: block so if anything is not okay it will get caught, I don't have to catch exceptions inside the function. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
unpacking first few items of iterable
Hi folks, I swear I used to know this but can't find it anywhere: What's the standard idiom for unpacking the first few items of an iterable whose total length is unknown? Something like a, b, c, _ = myiterable where _ could eat up a variable number of items, in case I'm only interested in the first 3 items? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: unpacking first few items of iterable
Hi folks, I swear I used to know this but can't find it anywhere: What's the standard idiom for unpacking the first few items of an iterable whose total length is unknown? Something like a, b, c, _ = myiterable where _ could eat up a variable number of items, in case I'm only interested in the first 3 items? If you're using python3, you can simply do: a, b, c, *rest = myiterable Thanks, sounds great, how about python2? -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: unpacking first few items of iterable
Hi folks, I swear I used to know this but can't find it anywhere: What's the standard idiom for unpacking the first few items of an iterable whose total length is unknown? Something like a, b, c, _ = myiterable where _ could eat up a variable number of items, in case I'm only interested in the first 3 items? If you're using python3, you can simply do: a, b, c, *rest = myiterable Thanks, sounds great, how about python2? If you know the sequence has at least n items, you can do a, b, c = seq[:3] Yeah, that's probably the simplest, without all the fancy stuff :) Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
assign only first few items of a tuple/list
Hi folks, I swear I used to know this but can't find it anywhere. Say I have a list x = [ 1,2,3,4,5 ] and only care about the first two items. I'd like to assign the first two items to two variables, something like, a, b, _ = x but the above will not work, of course, but what is the common idiom for this that does? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: can we append a list with another list in Python ?
can we append a list with another list in Python ? using the normal routine syntax but with a for loop ?? x = [1,2,3] y = [10,20,30] x.extend( y ) print x this will give you [1,2,3,10,20,30] which I guess is what you want. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Fwd: system tray or notification area in python
Hi folks, So I thought I would write a brand new stand alone system tray or notification area in python. I guess I need to use gtk bindings or some such but don't really know what my options are. Where would I start something like this? Any pointers would be greatly appreciated! Why not look at the source code of the current app your using to get an idea how that application accomplishes said task? I actually did that already it's using the C bindings of gtk. I think you are mistaken - if its this one: http://stalonetray.sourceforge.net/ Yes, that's it. I had a quick look into the sources, it does not use gtk at all, it uses low level X11 calls. Programming in this way is very tedious. Sorry, you are right. I was mixing things up, I just remembered it was gtk, apparently it's not. But I have zero experience with gui programming in python. So any pointers would be much appreciated how to implement a system tray in python. Gtk is I guess just one option, one could use other stuff from python but I wouldn't know what the simplest approach is. I'm not sure it is even possible. Usual GUI applications just need to request certain features from their window manager such as the setting the program icon or requesting a certain position on the screen. That is what is implemented in the usual toolits like Tk, QT, and gtk. That is my impression as well, tk, qt, etc, won't be good for this task but I thought there are some sort of X bindings in python that will make writing low level X applications in python possible. For instance a system tray :) A window manager, on the other hand, must be able to recieve and interpret these messages. For a system tray, they are described here: http://standards.freedesktop.org/systemtray-spec/systemtray-spec-0.3.html I have not studied the whole interface of the aforementioned toolkits, but I suspect that there is no way around writing low level Xlib code in order to recieve these messages. Right, but nobody wrote Xlib bindings for python? Don't take it wrong, but when you write that you have no experience with GUI programming, I'd start another projet first - I think you will have a tough way to succeed with this project. I certainly wouldn't start with Xlib in C, but if python bindings would be available that would make life much easier. Cheers, Daniel Christian -- http://mail.python.org/mailman/listinfo/python-list -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: system tray or notification area in python
So I thought I would write a brand new stand alone system tray or notification area in python. I guess I need to use gtk bindings or some such but don't really know what my options are. Where would I start something like this? Any pointers would be greatly appreciated! Why not look at the source code of the current app your using to get an idea how that application accomplishes said task? I actually did that already it's using the C bindings of gtk. I think you are mistaken - if its this one: http://stalonetray.sourceforge.net/ Yes, that's it. I had a quick look into the sources, it does not use gtk at all, it uses low level X11 calls. Programming in this way is very tedious. Right, but nobody wrote Xlib bindings for python? Erm, Google is your friend: python xlib turns up http://python-xlib.sourceforge.net/ as well as http://plwm.sourceforge.net/ which is pretty close to what you are trying to do. Great, thanks a lot! Don't take it wrong, but when you write that you have no experience with GUI programming, I'd start another projet first - I think you will have a tough way to succeed with this project. I certainly wouldn't start with Xlib in C, but if python bindings would be available that would make life much easier. Everything is easier in python:) because usually python libs are designed with OO and ease of use in mind. Beware that this will be much tougher than using gtkfriends. I guess so :) But it's a good excuse to get familiar with X :) Cheers, Daniel Christian -- http://mail.python.org/mailman/listinfo/python-list -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
system tray or notification area in python
Hi folks, I'm using a stand alone window manager without gnome or kde or any other de. But I still would like to have a system tray or notification area and so far used stalonetray for this. Stalonetray is written in C and is a GTK application, works all right but sometimes it doesn't. For instance if it is killed and restarted icons don't come back, etc, etc, there are some quirks. So I thought I would write a brand new stand alone system tray or notification area in python. I guess I need to use gtk bindings or some such but don't really know what my options are. Where would I start something like this? Any pointers would be greatly appreciated! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Fwd: system tray or notification area in python
Hi folks, I'm using a stand alone window manager without gnome or kde or any other de. But I still would like to have a system tray or notification area and so far used stalonetray for this. Stalonetray is written in C and is a GTK application, works all right but sometimes it doesn't. For instance if it is killed and restarted icons don't come back, etc, etc, there are some quirks. So I thought I would write a brand new stand alone system tray or notification area in python. I guess I need to use gtk bindings or some such but don't really know what my options are. Where would I start something like this? Any pointers would be greatly appreciated! Why not look at the source code of the current app your using to get an idea how that application accomplishes said task? I actually did that already it's using the C bindings of gtk. You might ask you I'm not modifying the code in order to achieve what I want, well, the answer is that I'd much rather prototype something like this in python than work immediately with gtk from C. But I have zero experience with gui programming in python. So any pointers would be much appreciated how to implement a system tray in python. Gtk is I guess just one option, one could use other stuff from python but I wouldn't know what the simplest approach is. Cheers, Daniel You could always use raw X11 libs but leveraging something like Gtk or Qt/KDE would probably be much easier. -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
terminate called after throwing an instance of 'CABRTException'
I've noticed a strange thing with python lately: Python 2.6.2 (r262:71600, Aug 21 2009, 12:23:57) [GCC 4.4.1 20090818 (Red Hat 4.4.1-6)] on linux2 Type help, copyright, credits or license for more information. def f(): print x ... f() terminate called after throwing an instance of 'CABRTException' Traceback (most recent call last): File stdin, line 1, in module File stdin, line 1, in f NameError: global name 'x' is not defined Clearly there is a NameError because x is not defined, but what the hell is the terminate . 'CABRTException' business? I guess it has to do with abrt but abrt is not running on my system at all. Also, if I run python2.7 with the above code I don't get the CABRTException stuff. What is really strange is that I have all sorts of recent files in /var/cache/abrt/pyhook-* indicating that somehow abrt is doing things even though it is not running, for instance chkconfig --list | grep abrt shows it off in all run levels. What's going on? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: terminate called after throwing an instance of 'CABRTException'
I've noticed a strange thing with python lately: Python 2.6.2 (r262:71600, Aug 21 2009, 12:23:57) [GCC 4.4.1 20090818 (Red Hat 4.4.1-6)] on linux2 Type help, copyright, credits or license for more information. def f(): print x ... f() terminate called after throwing an instance of 'CABRTException' Traceback (most recent call last): File stdin, line 1, in module File stdin, line 1, in f NameError: global name 'x' is not defined Clearly there is a NameError because x is not defined, but what the hell is the terminate . 'CABRTException' business? I guess it has to do with abrt but abrt is not running on my system at all. Also, if I run python2.7 with the above code I don't get the CABRTException stuff. What is really strange is that I have all sorts of recent files in /var/cache/abrt/pyhook-* indicating that somehow abrt is doing things even though it is not running, for instance chkconfig --list | grep abrt shows it off in all run levels. What's going on? No idea, but I'd have a look at sys.modules, and if import sys [name for name in sys.modules if abrt in name.lower()] [] gives a non-empty result I'd investigate where the culprit is imported -- /usr/lib/python2.6/sitecustomize.py would be the obvious candidate. Indeed! Thanks a lot, /usr/lib/python2.6/site-packages/sitecustomize.py was created by the package abrt-addon-python (at least this is the fedora name) and so it was activated by python itself completely independently from abrt (which was not running). Now I removed all packages called abrt-* and the problem is gone. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
lambda in list comprehension acting funny
funcs = [ lambda x: x**i for i in range( 5 ) ] print funcs[0]( 2 ) print funcs[1]( 2 ) print funcs[2]( 2 ) This gives me 16 16 16 When I was excepting 1 2 4 Does anyone know why? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: lambda in list comprehension acting funny
funcs = [ lambda x: x**i for i in range( 5 ) ] print funcs[0]( 2 ) print funcs[1]( 2 ) print funcs[2]( 2 ) This gives me 16 16 16 When I was excepting 1 2 4 Does anyone know why? And more importantly, what's the simplest way to achieve the latter? :) -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: lambda in list comprehension acting funny
funcs = [ lambda x: x**i for i in range( 5 ) ] print funcs[0]( 2 ) This gives me 16 When I was excepting 1 Does anyone know why? Just the way Python lambda expressions bind their variable references. Inner 'i' references the outer scope's 'i' variable and not its value 'at the time the lambda got defined'. And more importantly, what's the simplest way to achieve the latter? :) Try giving the lambda a default parameter (they get calculated and have their value stored at the time the lambda is defined) like this: funcs = [ lambda x, i=i: x**i for i in range( 5 ) ] Thanks a lot! I worked around it by def p(i): return lambda x: x**i funcs = [ p(i) for i in range(5) ] But your variant is nicer (matter of taste of course). Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: lambda in list comprehension acting funny
You should not be using lambda in this case .for x in [2, 3]: .funcs = [x**ctr for ctr in range( 5 )] .for p in range(5): .print x, funcs[p] .print If you change the requirements, it's always easy to solve problems. But it is the wrong problem that you have solved. The problem we have been asked to solve is to create a sequence of function objects, so that they can be called later, when needed, *not* to pre-calculate the results. In this case, the most obvious solution is to store a local variable in each function object with the value you want. funcs = [(lambda x, i=i: x**i) for i in range(5)] creates a list of five functions: lambda x, i=0: x**i lambda x, i=1: x**i lambda x, i=2: x**i and so on. In this case, each function has two local variables, x and i, with i having a default value. The function parameter i is bound to the value of i when the function was created. Because parameter defaults are calculated once, when the function is created, this causes the value of i to stick to the newly created function, and we get the result we need. What happens if you don't use a parameter with a default value? funcs = [(lambda x: x**i) for i in range(5)] In this case, each function body contains one local variable, x, and one non-local or global variable, i. Because i is a non-local, the function doesn't store a value for it. Instead, the function stores a lump of data pointing to just enough of the environment to fetch the current value of the non-local i when needed. Since all five functions are in the same environment, they all see the same value of i when you call them, regardless of what the value of i was when they were created. This is little different from doing this: i = 1 def f1(x): return x**i i = 2 def f2(x): return x**i i = 3 def f3(x): return x**i Is there any surprise that all three functions return the same value? They all point to the same global variable i. I'm not sure what it is about lambda that fools people into thinking that it is different (I've even been fooled myself!) but it is not. Thank you Steve! Precise and clear, as always! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Namespace hack
Funny, you got to the last line of import this but apparently skipped the second line: Explicit is better than implicit. And you didn't even post your message on April 1 so no, I can't laugh even though I'd like to. Can you be less condescending? Of course! :) Anyway, the point I was trying to make is that Steve's example is kinda cool but only as a funny exercise and not something for real life. Let's toy with python kinda thing, which is always welcome but with a big fat asterisk saying don't try this at home kids. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Namespace hack
From the Zen of Python (import this):
Namespaces are one honking great idea -- let's do more of those!
Inspired by this, I have a decorator that abuses function closures to
create a namespace type with the following properties:
- all methods are static methods that do not take a self parameter;
- methods can see class variables;
- external callers can see selected methods and attributes.
An example may make this clearer.
In a regular class:
class C:
x = 42
def spam(self, y):
return self.x + y
def ham(self, z):
return self.spam(z+1)
Notice that the class attribute x is visible to the outside caller, but
methods spam and ham cannot see it except by prefixing it with a
reference to self.
Here's an example using my namespace hack example:
@namespace
def C(): # Abuse nested functions to make this work.
x = 42
def spam(y):
return x + y
def ham(z):
return spam(z+1)
return (spam, ham) # Need an explicit return to make methods visible.
However, class attribute x is not exposed. You may consider this a
feature, rather than a bug. To expose a class attribute, define it in the
outer function argument list:
@namespace
def C(x=42):
def spam(y):
return x + y
def ham(z):
return spam(z+1)
return (spam, ham)
And in use:
C.x
42
C.spam(100)
142
C.ham(999)
1042
Here's the namespace decorator:
import inspect
def namespace(func):
spec = inspect.getargspec(func)
ns = {'__doc__': func.__doc__}
for name, value in zip(spec.args, spec.defaults or ()):
ns[name] = value
function = type(lambda: None)
exported = func() or ()
try:
len(exported)
except TypeError:
exported = (exported,)
for obj in exported:
if isinstance(obj, function):
ns[obj.__name__] = staticmethod(obj)
else:
raise TypeError('bad export')
Namespace = type(func.__name__, (), ns)
return Namespace()
Have fun!
Funny, you got to the last line of import this but apparently
skipped the second line:
Explicit is better than implicit.
And you didn't even post your message on April 1 so no, I can't laugh
even though I'd like to.
Cheers,
Daniel
--
Psss, psss, put it down! - http://www.cafepress.com/putitdown
--
http://mail.python.org/mailman/listinfo/python-list
Re: Open Source: you're doing it wrong - the Pyjamas hijack
Blatantly the pyjs ownership change turned out to be an awkward operation (as reactions on that ML show it), but a fork could also have very harmfully split pyjs-interested people, so all in all I don't think there was a perfect solution - dictatorships never fall harmlessly. You say fork could also have very harmfully split, what harms are you referring to? In the open source world there were tons of forks of projects and it proved to be a useful mechanism for resolving serious management issues. On the other hand the kind of hostile takeover that happened with pyjs is virtually unparalleled in the open source world. What made you think such a unique operation will be less harmful than the other which has already been tried many times? | Please get this absolutely clear in your head: that | | you do not understand my reasoning is completely and utterly | | irrelevant. i understand *your* reasoning; i'm the one making the | | decisions, that's my role to understand the pros and cons. i make a | | decision: that's the end of it. | | You present reasoning to me: i weight it up, against the other | | reasoning, and i make a decision. you don't have to understand that | | decision, you do not have to like that decision, you do not have to | | accept that decision.| Again, if you don't like the lead developer just fork the project, come up with a new name, new website and new infrastructure and start building a new community. Why didn't the rebels do that? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Open Source: you're doing it wrong - the Pyjamas hijack
It's also quite ironic that the initial complaining started from how the domain name www.pyjs.org is not available only pyjs.org is. At the same time the Rebel Chief's listed domain name on github, see https://github.com/xtfxme, gives you a server not found: http://the.xtfx.me/ :) On 5/9/12, anth...@xtfx.me anth...@xtfx.me wrote: On Tuesday, May 8, 2012 4:10:13 AM UTC-5, james hedley wrote: Agreed with pretty much all of that. It's third-world politics, lurching from one dictator to another. Risinger seems to have banned all discussion of the subject from the list too, I'm not posting anymore because I don't want to give him an excuse to wield his newly found banhammer. hello James, i'm not really sure what you're referring too ... you appear to be making these things up. i have not banned anything, or even alluded to it, whatsoever. i asked that one specific mail not be commented upon, as a request; perhaps this is the dreaded bannhammer you speak of? reading your accounts strewn about is interesting, what exactly are *your* motives? a simple curiosity, nothing more. your comparison to gov'ts is pretty skewed i would say, you know this as well as i. regardless of what you think or know of me, i have a permanent track record of being pretty fair and receptive to virtually anything, and am involved in a wide range of projects. Luke is a talented developer, there is no doubt of this, but he is one of the most socially inept persons i have ever encountered. leading your users to statements such as this: https://groups.google.com/forum/?fromgroups#!searchin/pyjamas-dev/credo/pyjamas-dev/xzp4CCWhJN4/nQ3-emtYFVgJ ... dozens of times on several occasions, is truly incredible. other such behavior, eg. being the only person in the history of the webkit project to ever be *ejected* from contributing or communicating *at all*, is further testament to the deficiencies provoking this maneuver. however, i have no interest in comparing or being compared. go read my notes again; i have a high level of respect for Luke in many capacities, and this has not changed. lets make one thing perfectly clear; you are not the only one who cares of this project or wishes it to succeed. mistakes were made. problems were had. the decisions however, stands. But yeah, a lot of the commentary from the pro-rebel side ( not that any of them admit they had anything to do with it ) really does come across as being ill-informed and childish. indeed, you have witnessed little chatter. however, barring your belief of such, i had received dozens of notes thanking me and attesting to a renewed impetus for action. the original goal was to purchase a domain and fork -- i made this very clear in my notes -- `uxpy.net`. however, the most respectable member of the commit IMO convinced me otherwise. names names, yes you want names? sorry :-(. alas, he, myself, and numerous others are still active and moving forward. the list is actually approaching 100 ... not the 4-5 you so graciously quoted. i am simply the point man willing to stand the flurry. likewise, i did not convince the domain holder to give me the domain. not only was he already aware prior to me approaching him -- list member, passive -- he was more that willing to assist in reinstating the projects foundations and direction. he *was* the person who left Luke in charge ... why do you think he was the owner? as far as im concerned, the domain was already hijacked; this was, in good faith, intended as remedy. this was not a easy or light decision, the dissonance exists to this day. the idea was to retain Luke, but he decided to play legal threats as the first card (which i'm afraid can only backfire), before he even knew of the domain changes. hge is not a victim here, nor is anyone else. so please, show some cognitive capacity by realizing this is not as black-and-white as you's like it to be. when you decide to include yourself -- sooner, or later -- you are more than welcome. @alex23 ... try reading a bit further. as a human i am subject to annoyance and frustration. i probably shouldn't have started the message in that manner, but the absurdity and absolute inaccurate statements being made were rather upsetting. you will note that i make it perfectly clear that Luke is a fantastic developer, and a great part of the team. this of course has neither waned nor faltered. i encourage anyone willing to take the time to consult the archives, pyjamas' and elsewhere, as they are the only path to proper answers. this will impact the project in both known and untold ways, but we have a great number of minds willing to push beyond. -- C Anthony -- http://mail.python.org/mailman/listinfo/python-list -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Open Source: you're doing it wrong - the Pyjamas hijack
the original goal was to purchase a domain and fork -- i made this very clear in my notes -- `uxpy.net`. however, the most respectable member of the commit IMO convinced me otherwise. (I'm a total outsider, never used pyjs.) Anthony, you never explained what the reasoning behind the advice of the most respectable member of the commit was. Why didn't you finally buy the new domain name, pick a new name, and fork the project? As it stands now the obvious answer for most people is because it looked easier to just take over than to build a new community, new infrastructure, new fame, etc, and I sure as hell like to take the easy road as opposed to the hard road. Until you clearly explain your reasoning for taking over as opposed to forking, the default answer is the above one. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Fetching data from a HTML file
On 3/23/12, Sangeet mrsang...@gmail.com wrote: Hi, I've got to fetch data from the snippet below and have been trying to match the digits in this to specifically to specific groups. But I can't seem to figure how to go about stripping the tags! :( trtd align=centerbSum/b/tdtd/tdtd align='center' class=green245/tdtd align='center' class=red11/tdtd align='center'0/tdtd align='center' 256/tdtd align='center' 1.496 [min]/td/tr /table Try beautiful soup: http://www.crummy.com/software/BeautifulSoup/ Actually, I'm working on ROBOT Framework, and haven't been able to figure out how to read data from HTML tables. Reading from the source, is the best (read rudimentary) way I could come up with. Any suggestions are welcome! Thanks, Sangeet -- http://mail.python.org/mailman/listinfo/python-list -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: format a measurement result and its error in scientific way
Thanks, it's simpler indeed, but gives me an error for value=1.267, error=0.08: Traceback (most recent call last): File /home/fetchinson/bin/format_error, line 26, in module print format_error( sys.argv[1], sys.argv[2] ) File /home/fetchinson/bin/format_error, line 9, in format_error error_scale += error.scaleb( -error_scale ).to_integral( ).adjusted( ) File /usr/lib64/python2.6/decimal.py, line 3398, in scaleb ans = self._check_nans(other, context) File /usr/lib64/python2.6/decimal.py, line 699, in _check_nans other_is_nan = other._isnan() AttributeError: 'int' object has no attribute '_isnan' Which version of python are you using? 2.7.1. At a guess, it's failing because scaleb() (which was new in 2.6) is buggily expecting a decimal argument, but adjusted() returns an int. Convert the results of the two adjusted() calls to decimals, and I think it should be fine. Great, with python 2.7 it works indeed! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: format a measurement result and its error in scientific way
Hi folks, often times in science one expresses a value (say 1.03789291) and its error (say 0.00089) in a short way by parentheses like so: 1.0379(9) Before swallowing any Python solution, you should realize, the values (value, error) you are using are a non sense : 1.03789291 +/- 0.00089 You express more precision in the value than in the error. My impression is that you didn't understand the original problem: given an arbitrary value to arbitrary digits and an arbitrary error, find the relevant number of digits for the value that makes sense for the given error. So what you call non sense is part of the problem to be solved. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: format a measurement result and its error in scientific way
Hi folks, often times in science one expresses a value (say
1.03789291) and its error (say 0.00089) in a short way by parentheses
like so: 1.0379(9)
One can vary things a bit, but let's take the simplest case when we
only keep 1 digit of the error (and round it of course) and round the
value correspondingly. I've been searching around for a simple
function that would take 2 float arguments and would return a string
but didn't find anything although something tells me it's been done a
gazillion times.
What would be the simplest such function?
Well, this basically works:
def format_error(value, error):
... precision = int(math.floor(math.log(error, 10)))
... format = %%.%df(%%d) % max(-precision, 0)
... return format % (round(value, -precision),
... int(round(error / 10 ** precision)))
...
format_error(1.03789291, 0.00089)
'1.0379(9)'
Note that math.floor(math.log(error, 10)) may return the wrong
decimal precision due to binary floating point rounding error, which
could produce some strange results:
format_error(10378929, 1000)
'10378900(10)'
So you'll probably want to use decimals instead:
def format_error(value, error):
value = decimal.Decimal(value)
error = decimal.Decimal(error)
value_scale = value.log10().to_integral(decimal.ROUND_FLOOR)
error_scale = error.log10().to_integral(decimal.ROUND_FLOOR)
precision = value_scale - error_scale
if error_scale 0:
format = %%.%dE % max(precision, 0)
else:
format = %%.%dG % (max(precision, 0) + 1)
value_str = format % value.quantize(decimal.Decimal(10) **
error_scale)
error_str = '(%d)' % error.scaleb(-error_scale).to_integral()
if 'E' in value_str:
index = value_str.index('E')
return value_str[:index] + error_str + value_str[index:]
else:
return value_str + error_str
format_error(1.03789291, 0.00089)
'1.0379(9)'
format_error(103789291, 1000)
'1.03789(1)E+08'
I haven't tested this thoroughly, so use at your own risk. :-)
Thanks a lot, this indeed mostly works, except for cases when the
error needs to be rounded up and becomes two digits:
format_error( '1.34883', '0.0098' )
'1.349(10)'
But in this case I'd like to see 1.35(1)
Cheers,
Daniel
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Re: format a measurement result and its error in scientific way
On 2/16/12, Ian Kelly ian.g.ke...@gmail.com wrote:
On Thu, Feb 16, 2012 at 1:36 AM, Daniel Fetchinson
fetchin...@googlemail.com wrote:
Hi folks, often times in science one expresses a value (say
1.03789291) and its error (say 0.00089) in a short way by parentheses
like so: 1.0379(9)
One can vary things a bit, but let's take the simplest case when we
only keep 1 digit of the error (and round it of course) and round the
value correspondingly. I've been searching around for a simple
function that would take 2 float arguments and would return a string
but didn't find anything although something tells me it's been done a
gazillion times.
What would be the simplest such function?
Well, this basically works:
def format_error(value, error):
... precision = int(math.floor(math.log(error, 10)))
... format = %%.%df(%%d) % max(-precision, 0)
... return format % (round(value, -precision),
... int(round(error / 10 ** precision)))
...
format_error(1.03789291, 0.00089)
'1.0379(9)'
Note that math.floor(math.log(error, 10)) may return the wrong
decimal precision due to binary floating point rounding error, which
could produce some strange results:
format_error(10378929, 1000)
'10378900(10)'
So you'll probably want to use decimals instead:
def format_error(value, error):
value = decimal.Decimal(value)
error = decimal.Decimal(error)
value_scale = value.log10().to_integral(decimal.ROUND_FLOOR)
error_scale = error.log10().to_integral(decimal.ROUND_FLOOR)
precision = value_scale - error_scale
if error_scale 0:
format = %%.%dE % max(precision, 0)
else:
format = %%.%dG % (max(precision, 0) + 1)
value_str = format % value.quantize(decimal.Decimal(10) **
error_scale)
error_str = '(%d)' % error.scaleb(-error_scale).to_integral()
if 'E' in value_str:
index = value_str.index('E')
return value_str[:index] + error_str + value_str[index:]
else:
return value_str + error_str
format_error(1.03789291, 0.00089)
'1.0379(9)'
format_error(103789291, 1000)
'1.03789(1)E+08'
I haven't tested this thoroughly, so use at your own risk. :-)
Thanks a lot, this indeed mostly works, except for cases when the
error needs to be rounded up and becomes two digits:
format_error( '1.34883', '0.0098' )
'1.349(10)'
But in this case I'd like to see 1.35(1)
A small adjustment to the scale fixes that. Also tidied up the string
formatting part:
import decimal
def format_error(value, error):
value = decimal.Decimal(value)
error = decimal.Decimal(error)
error_scale = error.adjusted()
error_scale += error.scaleb(-error_scale).to_integral().adjusted()
value_str = str(value.quantize(decimal.Decimal(1E%d % error_scale)))
error_str = '(%d)' % error.scaleb(-error_scale).to_integral()
if 'E' in value_str:
index = value_str.index('E')
return value_str[:index] + error_str + value_str[index:]
else:
return value_str + error_str
Cheers,
Ian
Thanks, it's simpler indeed, but gives me an error for value=1.267, error=0.08:
Traceback (most recent call last):
File /home/fetchinson/bin/format_error, line 26, in module
print format_error( sys.argv[1], sys.argv[2] )
File /home/fetchinson/bin/format_error, line 9, in format_error
error_scale += error.scaleb( -error_scale ).to_integral( ).adjusted( )
File /usr/lib64/python2.6/decimal.py, line 3398, in scaleb
ans = self._check_nans(other, context)
File /usr/lib64/python2.6/decimal.py, line 699, in _check_nans
other_is_nan = other._isnan()
AttributeError: 'int' object has no attribute '_isnan'
Which version of python are you using?
Cheers,
Daniel
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format a measurement result and its error in scientific way
Hi folks, often times in science one expresses a value (say 1.03789291) and its error (say 0.00089) in a short way by parentheses like so: 1.0379(9) One can vary things a bit, but let's take the simplest case when we only keep 1 digit of the error (and round it of course) and round the value correspondingly. I've been searching around for a simple function that would take 2 float arguments and would return a string but didn't find anything although something tells me it's been done a gazillion times. What would be the simplest such function? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: SQLObject 1.2.0
Thanks a million Oleg!
Cheers,
Daniel
On 11/20/11, Oleg Broytman p...@phdru.name wrote:
Hello!
I'm pleased to announce version 1.2.0, the first stable release of branch
1.2 of SQLObject.
What is SQLObject
=
SQLObject is an object-relational mapper. Your database tables are
described
as classes, and rows are instances of those classes. SQLObject is meant to
be
easy to use and quick to get started with.
SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).
Where is SQLObject
==
Site:
http://sqlobject.org
Development:
http://sqlobject.org/devel/
Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss
Archives:
http://news.gmane.org/gmane.comp.python.sqlobject
Download:
http://pypi.python.org/pypi/SQLObject/1.2.0
News and changes:
http://sqlobject.org/News.html
What's New
==
Features Interface
* Strings are treated specially in Select to allow
Select(['id, 'name'], where='value = 42'). Update allows a string in
WHERE.
* ForeignKey('Table', refColumn='refcol_id') to allow ForeignKey to
point to a non-id column; the referred column must be a unique integer
column.
* delColumn now accepts a ForeignKey's name without 'ID'.
* Support for PostgreSQL 7.* is dropped. The minimal supported version of
PostgreSQL is 8.1 now.
* Quoting rules changed for PostgreSQL: SQLObject uses E'' escape string
if the string contains characters escaped with backslash.
* A bug caused by psycopg2 recently added a new boolean not callable
autocommit attribute was fixed.
* sqlobject.__doc__ and main.__doc__ no longer contain version number.
Use sqlobject.version or version_info.
For a more complete list, please see the news:
http://sqlobject.org/News.html
Oleg.
--
Oleg Broytmanhttp://phdru.name/p...@phdru.name
Programmers don't die, they just GOSUB without RETURN.
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OT
I'll be 59 in a couple of months. -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: web hosting, first hand experiences?
Hi folks, I know this comes up regularly but the thing is that the quality of service changes also quite regularly with many of the hosting companies. What's currently the best option for shared hosting of a turbogears application? I'm thinking of dreamhost and webfaction does anyone have any recent experiences with these two? Or others? Cheers, Daniel Hi Daniel, I can wholeheartedly recommend WebFaction. I currently have an account running 3 different CherryPy applications (so TurboGears shouldn't pose any problems), and apart from initial teething problems, they have been running for months without interruption. As well as an excellent control panel, they give you full Linux command-line access to your site(s). The level of support is as good as you will get anywhere (short of having experts with you in the office!), and they know a huge amount about Python web applications. Nothing seems to be too much trouble for them. They also provide a 60-day money-back guarantee, so you can try-before-you-buy. Best wishes, Alan Harris-Reid Thanks for all the responses, based on the feedback I'll go with webfaction I guess. They were my first choice anyway but wanted to double check with people in the know about their current situation. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
web hosting, first hand experiences?
Hi folks, I know this comes up regularly but the thing is that the quality of service changes also quite regularly with many of the hosting companies. What's currently the best option for shared hosting of a turbogears application? I'm thinking of dreamhost and webfaction does anyone have any recent experiences with these two? Or others? Cheers, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: New member intro and question
gush I'm a new list member from the United States. Long time programmer, fairly new to Python and absolutely loving it so far! I'm 36, live in Oklahoma, and own a small Linux software development and consulting firm. Python has made my life a *lot* easier and, the more I learn, the easier it gets. Simply blown away. /gush Now, for my question: I'm taking on a project that will run on plug computers and I'm thinking about using Python to do it. It seems like a really attractive option over C/C++ and I think it would cut down the dev time immensely. I know a scaled down version of Debian can run on the computer but I'm wondering about Python. Has anyone ever used Python to develop for extremely limited resource computers like this? Specifically, I'm going to be using the DreamPlug (http://www.geek.com/articles/gadgets/dreamplug-puts-a-1-2ghz-arm-pc-in-a-power-outlet-2011022/) which isn't too shabby but I wonder if it will work. The netbook I use with fedora linux and basically every major python release from 2.4 to 3.2 has more limited resources :) So yes, python would run on your gadget no problem. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Postmortem on Unladen Swallow
There's a postmortem on the failure of Unladen Swallow by one of the developers at: http://qinsb.blogspot.com/2011/03/unladen-swallow-retrospective.html This outcome of things is really a testament to the hard work of the pypy folks. They, a volunteer bunch, beat google! And that's something to be proud of, I'd think. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Common practice for multiple python versions sharing 3rd party modules
Hi folks, In order to test my own modules with various python versions I've installed python 2.4, 2.5, 2.6, 2.7, 3.1, 3.2. The original installation on my fedora box was 2.6 and all 3rd party modules so far were installed under /usr/lib/python2.6/site-packages. Since now the executable 'python' points to python 2.7 and lot of programs have #!/usr/bin/env python at the top, these programs try to use 2.7. But there are no 3rd party modules installed for 2.7 so programs that need these do not run. Of course I can just replace #!/usr/bin/env python with #!/usr/bin/env python2.6 but doing so for all programs would be a pain. Also, once I have a 3rd party module installed in /usr/lib/python2.6/site-packages I wouldn't want to copy all of these to /usr/lib/pythonX.Y/site-packages (assuming they are compatible with pythonX.Y). What would be the most common practice for having a single location for 3rd party modules and all python versions could have access to them? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Fun python 3.2 one-liner
what is the character limit on a one liner :P. For PEP 8 compliance, 80 characters. :-) Yeah, but we don't live in the 80's or 90's anymore and our screens can support xterms (or let alone IDE widows) much wider than 80 characters. I'm using 140 for python these days. Seriously, who would want to limit him/herself to 80 characters in 2011? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Fun python 3.2 one-liner
what is the character limit on a one liner :P. For PEP 8 compliance, 80 characters. :-) Yeah, but we don't live in the 80's or 90's anymore and our screens can support xterms (or let alone IDE widows) much wider than 80 characters. I'm using 140 for python these days. Seriously, who would want to limit him/herself to 80 characters in 2011? Seriously, or is that a rhetorical question? Rhetorical :) What it intended to demonstrate is that it is possible to rationalize ancient habits which have their origins in particular circumstances of those ancient times but actually nothing necessitates them today other than the momentum built around them during their lifetime (which is a pretty strong argument for them by the way). Cheers, Daniel People who like to have two source files side-by-side on a standard sized monitor, or three on a wide-screen monitor. People who need to read or edit source code on a virtual terminal rather than in a GUI console app. People who print out source code to read later. People with poor vision who need to use a significantly larger sized characters, and therefore can't fit as many on a line. People who might want to email code snippets without having them inconveniently wrapped by the mail client. People who don't like reading really long, overly complex, lines, and prefer to keep lines short for readability. And most importantly... people who want to have their code accepted into the Python standard library. Personally, I find that the discipline of keeping to 80 characters is good for me. It reduces the temptation of writing obfuscated Python one- liners when two lines would be better. The *only* time it is a burden is when I write doc strings, and even then, only a small one. -- Steven -- http://mail.python.org/mailman/listinfo/python-list -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Suggestion Reqd for Designing a Website in Python
I have developed one big Machine Learning software a Machine Translation system in Python. Now, I am thinking to make a User Interface of it and upload it in a web site. Do you mean you want people to download this from a web site as an executable, and then run it locally on their computers? Or do you mean you want people to use this as a web site, using their web browsers? The answers are very different. My questions are: (i) For Designing an interface I am choosing Tkinter. Is it fine? (ii) How to connect this interface with my Tkinter based interface - should I have to recode the whole system? (iii) After designing I want to upload now how to do the server side scripting? Question (i) implies that you want the first option (download an executable and run it). Question (iii) implies the second (that you want your app to run on a web server so people use it through your browser). Please clarify. -- Tim Roberts, t...@probo.com Providenza Boekelheide, Inc. Thank you for your kind reply. I want to design an interface like Google Translate. So that users can paste text (of any length)-or may browse files which can be uploaded, and one user interface for filling up form, so that attached files after translation may be sent back to the given e-mail id as an attached file(.pdf/.txt). Best Regards, Subhabrata. In this case you are looking for a web application framework. There are many written in python, a good place to start would be: http://wiki.python.org/moin/WebFrameworks My personal opinion is that the 3 top frameworks to consider are: (1) django (2) turbogears (3) web2py. You need to decide for yourself which one use choose, you may even choose something other than these 3, there are tons more. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Use the Source Luke
For the Python world though, there does seem to have been a change. A decade ago in this newsgroup, there were frequent references to standard library source. I don't see that much anymore. Popularity has a price. A decade ago only hackers were exposed to python who are happy to chat about the source code but these days average computer users (my grandma) frequently come across python and ask questions from a user perspective. So I'd think your observation is correct that the ratio of source related posts to non-source related posts on this list went down but the reason is not because the total number of source related questions decreased but because the total number of non-source related questions increased. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Interesting bug
Dear Group, Hope all of you are fine and spending nice new year evenings. I get a bug in Python over the last 4 years or so, since I am using it. The language is superb, no doubt about it. It helped me finish many a projects, with extraordinary accuracy. But long since, I was getting an interesting bug. In the initial days, I thought it may be my learning error or usability error. It comes every now and then. The bug is suppose I am calling a library or using some logical operator, it works fine initially but if I want to copy the code to some other modules, same line of codes do not run at all. The remedy I do is, (a) I take the code from file and test it in GUI, more astonishingly in 99% of the cases I found the code llines, are correct. Then I apply a brute force technique I rewrite the whole code again. For small codes this technique is okay, but if I write mammoth code, and all on a sudden some interesting behavior came out, well it really feels bad. I keep now a days some time out that I have to do this, but is there any definite solution? I believe there is some, as I do not know them, as it happens, unnecessarily get upset. I use Python on WinXP service pack2, I started to use Python2.5.1, and now I am using Python2.6.5, IDLE as GUI. Best Regards, Subhabrata An AI bot is playing a trick on us. Focus and don't let your guards down! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Interning own classes like strings for speed and size?
I'm trying to solve a computational problem and of course speed and size is important there. Apart from picking the right algorithm, I came across an idea that could help speed up things and keep memory requirements down. What I have is regions described by min and max coordinates. At first, I just modeled these as a simple class containing two values for each axis. In a second step, I derived this class from tuple instead of object. Some code then moved from __init__ to __new__ and some code that modified these objects had to be changed to replace them instead. The upside to this is that they can be used as keys in sets and dicts, which isn't the case for mutable types[1]. What I'm now considering is to only allow a single instance of these objects for each set of values, similar to interned strings. What I would gain is that I could safely compare objects for identity instead of equality. What I'm not yet sure is how much overhead that would give me and/or how to keep it low. The idea is to store each instance in a set and after creating a new object I would first look up an equal object in the global set and return that instead, otherwise add the new one. The problem I foresee is that if I define equality as identity, this lookup when creating will never eliminate duplicates. If I only fall back to equality comparison for non-identical objects, I would probably sacrifice most of the gain. If I build a dict mapping between the values and the actual objects, I would have doubled the required memory and uselessly store the same values twice there. Am I looking in the wrong direction? Is there some better approach? Please don't tell me to use C, as I'm specifically interested in learning Python, I'm pretty sure I could have solved the problem quickly in C++ otherwise. Other suggestions? Cheers! Uli [1] Somebody correct me if I'm wrong, but I believe I could have defined a hashing function for the type and thus allowed its use in a set or dict, right? However, goofing up because you accidentally modified an object and changed its hash value is something I don't want to risk anyway. I believe what you are looking for is (some variant of) the singleton pattern: http://en.wikipedia.org/wiki/Singleton_pattern How it's done in python see http://www.google.com/search?q=python+singleton Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Interning own classes like strings for speed and size?
I believe what you are looking for is (some variant of) the singleton pattern: http://en.wikipedia.org/wiki/Singleton_pattern Actually, no. What I want is the flyweight pattern instead: http://en.wikipedia.org/wiki/Flyweight_pattern Oh I see. I did not know about this pattern, but in my defense it looks like a variant of the singleton pattern :) Thanks! One always learns something new on python-list. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Web App
Anybody know where I can find a Python Development Environment in the form of a web app for use with Chrome OS. I have been looking for a few days and all i have been able to find is some old discussions with python developers talking about they will want one for the OS to be a success with them. Personally, I think a web app based IDE would be ghastly; but, you might have a look at Mozilla Skywriter (formerly Bespin): Why grashtly? I don't personally think the web makes a good framework for highly interactive applications as they must work within the constraints of the browser and IDEs are highly interactive applications by their very nature. Perhaps HTML5/CSS3 will change things; but, standard DOM manipulation, as I am accustomed to seeing it, cannot generate the kind of rendering that is available from native applications. Attempts to do so end up being kludgy. It also cannot handle the kinds of desktop integrations that are common for native applications without opening up serious security trust issues. (Can everybody say ActiveX fiasco?) So, in essence, you are predicting that google's chrome OS will be a failure, right? Finally, there are difficulties in handling keystrokes without conflicting with the browser's native key bindings. I seldom ever touch a mouse and I am a huge fan of vi, mutt, slrn, screen, ratpoison, etc. where the primary interface is totally accessable through the keyboard without having to tab through many options. Well, implementing vi or other text based tools in the browser is trivial. I mean it will function in exactly the same way as a native vi. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Added Python, WSGI to XAMPP
How-To: Add VirtualEnv and Pylons (WSGI framework) to XAMPP http://www.apachefriends.org/f/viewtopic.php?f=17t=42981 Maybe, if there's no Zope. Or we'll run away screaming... That is rather pathetically true... Ah well, each to their own... Chris What I really don't like right off is that Pyramid is contorting the MVC model just as Django did with their MTV model. They are both making the controller be the view and this confuses the hell out of people who come from true MVC based projects. The VIEW is the bits that stream out of the webserver back to the users browser. The CONTROLLER is the code that gathers all the pieces from the model and constructs the python code that is then fed to the engine that then creates the view. And just because the controller navigates the logic to dynamically contruct/render a view, that does not make 'it' the view. In turbogears that is exactly what happens. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: inverse of a matrix with Fraction entries
I wouldn't do it that way. Let M be your matrix. Work out the LCM l of the denominators, and multiply the matrix by that to make it an integer matrix N = l M. Then work out the determinant d of that integer matrix. Next, the big step: use Gaussian elimination to find a matrix A (the `adjugate matrix') such that A N = d I. This should be doable entirely using integer arithmetic, and I think without needing any divisions. Finally, we have l A M = d I, so (l/d A) M = I and l/d A is the inverse you seek. Does that make sense? Absolutely! But there is nothing wrong with working out the inverse directly using fractions.Fraction arithmetic, I'd think. It'll work, certainly; but the Fraction implementation will have to do a buttload of GCD computations that it wouldn't need to do if you worked with plain integers. And GCDs are relatively hard, as arithmetical computations go: the usual algorithms require either a number of divisions (which are themselves rather costly) or a bitwise traversal of one of the operands. A million entries seems nontrivial for a matrix, and Gaussian elimination has cubic running time if I remember rightly; I suspect that the transformations I describe would reduce the running time by a fair amount. Of course, I might be drastically underestimating the performance of modern hardware -- I often do -- so this may not be especially relevant. Anyway, the possibility's there. Okay, I see your point and I completely agree. Surely it will be faster to do it with integers, will give it a shot. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
inverse of a matrix with Fraction entries
I guess this is a question to folks with some numpy background (but not necessarily). I'm using fractions.Fraction as entries in a matrix because I need to have very high precision and fractions.Fraction provides infinite precision (as I've learned from advice from this list). Now I need to calculate its inverse. Can numpy help in this regard? Can I tell numpy that the inverse matrix should also have entries in fractions.Fraction? Or numpy can only do floating point calculations? Probably it doesn't matter but the matrix has all components non-zero and is about a thousand by thousand in size. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: inverse of a matrix with Fraction entries
I guess this is a question to folks with some numpy background (but not necessarily). I'm using fractions.Fraction as entries in a matrix because I need to have very high precision and fractions.Fraction provides infinite precision (as I've learned from advice from this list). Infinite precision only for values that can be expressed as a fraction: Fraction(2)**Fraction(1, 2) 1.4142135623730951 type(_) type 'float' True, but I only need to add, multiply and divide my fractions in order to end up with the entries in the matrix. Now I need to calculate its inverse. Can numpy help in this regard? Can I tell numpy that the inverse matrix should also have entries in fractions.Fraction? Or numpy can only do floating point calculations? I tried it, and numpy.linalg.inv() converted the Fraction values to float. If you aren't concerned about efficiency it should be easy to do it yourself, in pure python. If there is no other way, that's what I'll try to do. You could also ask on the numpy mailing list. Probably it doesn't matter but the matrix has all components non-zero and is about a thousand by thousand in size. Hmm, where did you get that million of exact fractions from? The million of exact fractions are coming from a recursion relation. This recursion relation only adds, multiplies and divides numbers so the end result is always a rational number. If some real world data is involved the error introduced by the floating point calculation may be negligable in comparison with the initial measurement uncertainty. It's a mathematical problem so no uncertainty is present in the initial values. And even if there was, if there are many orders of magnitude differences between the entries in the matrix floating point does not suffice for various things like eigenvalue calculation and stuff like that. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: inverse of a matrix with Fraction entries
I guess this is a question to folks with some numpy background (but not necessarily). I'm using fractions.Fraction as entries in a matrix because I need to have very high precision and fractions.Fraction provides infinite precision (as I've learned from advice from this list). Infinite precision only for values that can be expressed as a fraction: Fraction(2)**Fraction(1, 2) 1.4142135623730951 type(_) type 'float' True, but I only need to add, multiply and divide my fractions in order to end up with the entries in the matrix. Now I need to calculate its inverse. Can numpy help in this regard? Can I tell numpy that the inverse matrix should also have entries in fractions.Fraction? Or numpy can only do floating point calculations? I tried it, and numpy.linalg.inv() converted the Fraction values to float. If you aren't concerned about efficiency it should be easy to do it yourself, in pure python. If there is no other way, that's what I'll try to do. You could also ask on the numpy mailing list. Probably it doesn't matter but the matrix has all components non-zero and is about a thousand by thousand in size. Hmm, where did you get that million of exact fractions from? The million of exact fractions are coming from a recursion relation. This recursion relation only adds, multiplies and divides numbers so the end result is always a rational number. If some real world data is involved the error introduced by the floating point calculation may be negligable in comparison with the initial measurement uncertainty. It's a mathematical problem so no uncertainty is present in the initial values. And even if there was, if there are many orders of magnitude differences between the entries in the matrix floating point does not suffice for various things like eigenvalue calculation and stuff like that. It may be worthwhile to have a look at http://www.sagemath.org/ sage: Matrix([[1,2],[3,4]])**-1 [ -21] [ 3/2 -1/2] sage: a = Matrix([[1,2],[3,4]]) sage: b = Matrix([[1,2],[3,4]])**-1 sage: a*b [1 0] [0 1] sage: type(b[1,1]) type 'sage.rings.rational.Rational' This sounds like a good idea! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: inverse of a matrix with Fraction entries
I'm using fractions.Fraction as entries in a matrix because I need to have very high precision and fractions.Fraction provides infinite precision . . . Probably it doesn't matter but the matrix has all components non-zero and is about a thousand by thousand in size. I wonder how big the numerators and denominators in those fractions are going to get during the matrix inversion. Would it be surprising if the elements of the inverse matrix had numerators and denominators a million times longer than the original matrix? I've checked this with Maple for matrix size 150 x 150 and the numerators and denominators do get pretty long. But that's okay as long as it is kept exact. The whole story is that I have a matrix A and matrix B both of which have rational entries and they both have pretty crazy entries too. Their magnitude spans many orders of magnitude, but inverse(A)*B is an okay matrix and I can deal with it using floating point numbers. I only need this exact fraction business for inverse(A)*B (yes, a preconditioner would be useful :)) And I wouldn't want to write the whole matrix into a file, call Maple on it, parse the result, etc. So after all I might just code the inversion via Gauss elimination myself in a way that can deal with fractions, shouldn't be that hard. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: inverse of a matrix with Fraction entries
It's a mathematical problem so no uncertainty is present in the initial values. And even if there was, if there are many orders of magnitude differences between the entries in the matrix floating point does not suffice for various things like eigenvalue calculation and stuff like that. Well, if you want to do eigenvalue calculations, you are going to have to start doing numerical approximations anyways. There is no analytical solution for matrices larger than 4x4. Sure! (I didn't explain the whole thing yet, see the other reply where I actually do.) Sympy will do inverses of matrices over rationals for you, though: |4 from sympy import * |6 m = Matrix([[S(1)/2, S(1)/3], [S(1)/4, S(1)/5]]) |7 m [1/2, 1/3] [1/4, 1/5] |8 m.inv() [ 12, -20] [-15, 30] Thanks a lot! This sounds like the simplest solution so far. I don't need to call Maple after all :) Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: inverse of a matrix with Fraction entries
So after all I might just code the inversion via Gauss elimination myself in a way that can deal with fractions, shouldn't be that hard. I wouldn't do it that way. Let M be your matrix. Work out the LCM l of the denominators, and multiply the matrix by that to make it an integer matrix N = l M. Then work out the determinant d of that integer matrix. Next, the big step: use Gaussian elimination to find a matrix A (the `adjugate matrix') such that A N = d I. This should be doable entirely using integer arithmetic, and I think without needing any divisions. Finally, we have l A M = d I, so (l/d A) M = I and l/d A is the inverse you seek. Does that make sense? Absolutely! But there is nothing wrong with working out the inverse directly using fractions.Fraction arithmetic, I'd think. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
what's the precision of fractions.Fraction?
I do a recursive evaluation of an expression involving fractions and unsurprisingly the numerator and denominator grows pretty quickly. After 10-20 iterations the number of digits in the numerator and denominator (as integers) reaches 80-100. And I'm wondering until what point I can trust the result since I'm using fractions.Fraction for the whole procedure. Are Fraction's infinite precision? Or will I get some sort of an exception if python is not able to represent the numerator and/or denominator as integers? http://www.python.org/dev/peps/pep-3141/ was not very helpful in this regard nor was http://docs.python.org/library/fractions.html Any ideas? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: what's the precision of fractions.Fraction?
I do a recursive evaluation of an expression involving fractions and unsurprisingly the numerator and denominator grows pretty quickly. After 10-20 iterations the number of digits in the numerator and denominator (as integers) reaches 80-100. And I'm wondering until what point I can trust the result since I'm using fractions.Fraction for the whole procedure. Are Fraction's infinite precision? Or will I get some sort of an exception if python is not able to represent the numerator and/or denominator as integers? Since fractions are represented as a pair of integers, and since python integers have unlimited precision, I would guess that fractions also have unlimited precision. You could check the code if you want to be absolutely sure. Sounds reasonable, thanks a lot, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Am I The Only One Who Keeps Reading “Numpy” as “Numpty”?
As in Numpty Dumpty? Sorry... -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: PyGUI 2.3
The problem is that some part of the application gets installed to /home/fetchinson/.local/lib/python2.6/site-packages/GUI and some other parts get installed to /home/fetchinson/.local/lib/python/site-packages/GUI Which parts get installed in which places, exactly? This gets installed to /home/fetchinson/.local/lib/python/GUI : Generic Gtk __init__.py __init__.pyc Version.py Version.pyc _where.py _where.pyc And this gets installed to /home/fetchinson/.local/lib/python2.6/site-packages/GUI : Resources I'm puzzled, because I can't see anything in the setup.py that could result in things getting split up like this. I'm wondering whether there is some breakage in distutils. I honestly have no idea :) Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: cms 4 static pages?
m looking 4 a framework, that allows to build static community software (similar to facebook) without having to start scripts, database connects, admin cookies, e.t.c. means - should be dynamic without really being dynamic, delivering just static pages. (yes, i know e.g. nginx does that by caching, thats not what i want!) features wanted: a not database driven b password access ist done by just renaming users home directory. User at logout will receive new secret subdirectory name 4 new login. c no clientside scripting. changing layout will be done by rebuilding all relevant static pages in user directory once by serverside script. d new entries e.g. mail, discussions will be queued, user just sees: tnx 4 your new article, page will be rebuilt in ... estimated 3 seconds ... or estimated 10 seconds ... depending on load and todo queue length. e load balancing is done by just replicating static pages between servers after new rebuild of static pages. f simulation of received mail directory through just rebuilding relevant static html tree. attachments not allowed. g intelligent todo queue 4 resorting mail sent, received, discussions, look and feel before rebuilding static user pages. (herein lies the intelligence of the whole system) h notifications 4 new mail, messages, e.t.c. are just updates in static html fields. if user gets offline (measured by time since last update of static pages) user will be informed once a day by mail. i simulation of locking can easily be done by dotfiles. j according 2 my calculations such system should be able 2 satisfy any bandwidth without causing significant load of cpu, due 2 low protocol overhead and no server side scripting, no database load. overload of server should not possible by design. k modules, addon 4 twitter e.g., nice 2 have (and no, no java!) any pointers? Yeah, rethink your design! Seriously, you listed a number of features which are not really features but implementation details and you haven't told us what your original goals are which you think are fulfilled by these implementation details. If you would clearly state what your goals are (regardless of how it is implemented) I'm 100% certain a better implementation can be found than the one you enumerated. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: playful coding problems for 10 year olds
Hi folks, My niece is interested in programming and python looks like a good choice (she already wrote a couple of lines :)) She is 10 and I thought it would be good to have a bunch of playful coding problems for her, stuff that she could code herself maybe after some initial help. Do you guys know problems like these? Or a good resource where to look them up? Cheers, Daniel There's a great book valled 'Invent your own computer games using Python', aimed at kids, which teaches programming from tne ground up, in the context of writing games, starting with terminal word games, ending with Pygame fullscreen 2D vector graphic bitmaps affairs. http://inventwithpython.com/ The website says aimed at kids 'ages 10 to 12 and upwards', so it sounds like she's on the minimum cusp. (now I come to look at the website, one of the quotes he features is from an Amazon review I wrote months ago! :-) Thanks a lot for everyone for the suggestions, I think I'll be able to cook things up from all the references you sent! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
playful coding problems for 10 year olds
Hi folks, My niece is interested in programming and python looks like a good choice (she already wrote a couple of lines :)) She is 10 and I thought it would be good to have a bunch of playful coding problems for her, stuff that she could code herself maybe after some initial help. Do you guys know problems like these? Or a good resource where to look them up? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: PyGUI 2.3
PyGUI 2.3 is available: http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/ This version works on Snow Leopard with PyObjC 2.3. What is PyGUI? -- PyGUI is a cross-platform GUI toolkit designed to be lightweight and have a highly Pythonic API. Installation to a custom location with python setup.py install --home=/home/fetchinson/.local makes GUI un-importable: [fetchin...@fetch ~]$ python Python 2.6.2 (r262:71600, Aug 21 2009, 12:23:57) [GCC 4.4.1 20090818 (Red Hat 4.4.1-6)] on linux2 Type help, copyright, credits or license for more information. import GUI Traceback (most recent call last): File stdin, line 1, in module ImportError: No module named GUI The problem is that some part of the application gets installed to /home/fetchinson/.local/lib/python2.6/site-packages/GUI and some other parts get installed to /home/fetchinson/.local/lib/python/site-packages/GUI which makes the install broken. If I move everything from the latter location to the former, it all works though. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: PyGUI 2.3
PyGUI 2.3 is available: http://www.cosc.canterbury.ac.nz/greg.ewing/python_gui/ This version works on Snow Leopard with PyObjC 2.3. Any reason your project is not easy_installable? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
[OFF] sed equivalent of something easy in python
This question is really about sed not python, hence it's totally off. But since lots of unix heads are frequenting this list I thought I'd try my luck nevertheless. If I have a file with content 1 2 3 4 5 6 7 8 ... i.e. each line contains simply its line number, then it's quite easy to convert it into 2 3 7 8 12 13 ... using python. The pattern is that the first line is deleted, then 2 lines are kept, 3 lines are deleted, 2 lines are kept, 3 lines are deleted, etc, etc. But I couldn't find a way to do this with sed and since the whole operation is currently done with a bash script I'd hate to move to python just to do this simple task. What would be the sed equivalent? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: [OFF] sed equivalent of something easy in python
using python. The pattern is that the first line is deleted,
then 2 lines are kept, 3 lines are deleted, 2 lines are kept,
3 lines are deleted, etc, etc.
If you have GNU sed, you can use
sed -n '2~5{N;p}'
which makes use of the GNU ~ extension. If you need a more
portable version:
sed -n '1d;N;p;N;N;N;d'
Both have the side-effect that the expect the printed lines to
come in pairs, so if you have
seq 17 | sed -n '...'
it won't print the 17, but if you take it to 18, it will print 17
and 18. To address that (so to speak), you can use
sed -n '1d;p;n;p;N;N;N;d'
Thanks a lot, Tim!
But I couldn't find a way to do this with sed and since the
whole operation is currently done with a bash script I'd hate
to move to python just to do this simple task.
I'm not sure this is a great reason to avoid Python, but whatever
floats your boat :)
Well, the reason I wanted to avoid python in this particular case is
that I have a large bash script that does its job perfectly and I
needed to insert this additional task into it. I had 3 choices: (1)
rewrite the whole thing in python (2) add this one task in python (3)
add this one task in sed. I chose (3) because (1) looked like a waste
of time and (2) made me take care of 2 files instead of 1 from now on.
Cheers,
Daniel
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Does everyone keep getting recruiting emails from google?
I keep getting recruiting emails from charlesngu...@google.com about working for google as an engineer. The messages are pretty much the same and go like this: I am part of the Google Staffing team and was wondering if you would be open to exploring engineering opportunities with Google. I am impressed with your background and thought your skills could be a fit for our team. I am currently looking for Engineers with hybrid Unix/Linux Systems Administrators who possess experience in coding in C/C++ or Java and/or scripting skills (Perl, Python, or Shell). The Google.com Engineering Team is one of the most visible and respected teams within Google, and the most mission critical. The team is responsible for keeping the Google site and infrastructure up and running 24/7, 365 days/year. They are dedicated to the scalability and availability for the performance of Google applications. In short, they maintain, monitor, and improve all Google services. Locations primarily concentrated in Mt. View, Dublin, Zurich, with distributed teams in San Francisco, Santa Monica, Boston, Kirkland, Seattle, New York, London, and Sydney. If you are interested, please email me an updated resume. If the timing isn’t right for you to make a move, I would love to connect on LinkedIn, and hopefully, we can keep in touch. Any referrals would be appreciated! - I'm guessing I'm not the only one on this list to get these emails and suspect that pretty much everyone gets them. Is that the case? If yes, what's the point of spamming a more-or-less random set of people who although are probably interested in IT-related stuff but who can otherwise also be a set of dogs. Aren't enough people applying without this? Just wondering, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: how do I search python mailing list archives?
What are the various ways to search the python mailing list archives? If you are searching for 'foo' and 'bar' you can try this in google: foo bar site:mail.python.org inurl:python-list Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: How Python works: What do you know about support for negative indices?
Raymond Hettinger pyt...@rcn.com writes: It doesn't seem to be common knowledge when and how a[x] gets translated to a[x+len(x)]. So, here's a short info post on how Python supports negative indices for sequences. Thanks for this. Could you post your messages using a channel that doesn't arbitrarily split your paragraphs into long-short-long-short lines? It came across fine for me as well (gmail with basic html interface). It makes paragraphs burdensome to read, and I skipped most of the message because of that. You might want to switch to a client where you do not have this problem. I encourage anyone whose messages are munged like that to seek correction from their mail service provider, and switch to a different one until it's fixed. I encourage anyone who has problems with reading various emails, newsgroup postings, forums and what not, to start using modern tools that work with the vast majority of other tools. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: fairly urgent request: paid python (or other) work required
On 9/1/10, lkcl luke.leigh...@gmail.com wrote: i apologise for having to contact so many people but this is fairly urgent, and i'm running out of time and options. i'm a free software programmer, and i need some paid work - preferably python - fairly urgently, so that i can pay for food and keep paying rent, and so that my family doesn't get deported or have to leave the country. i really would not be doing this unless it was absolutely, absolutely essential that i get money. so that both i and the list are not unnecessarily spammed, please don't reply with recommendations of where to get jobs, unless they are guaranteed to result in immediate work and money. if you have need of a highly skilled and experienced python-preferring free-software-preferring software engineer, please simply contact me, and tell me what you need doing: there's no need for you to read the rest of this message. so that people are not offended by me asking on such a high-volume list for work, here are some questions and answers: Q: who are you? A: luke leighton. free sofware developer, free software project leader, and unusual cross-project mash-up-er (meaning: i spot the value of joining one or more bits of disparate stuff to make something that's more powerful than its components). Q: where's your CV? A: executive version of CV is at http://lkcl.net/exec_cv.txt - please don't ask for a proprietary microsoft word version, as a refusal and referral to the sylvester response often offends. Q: what can you do? A: python programming, c programming, web development, networking, cryptography, reverse-engineering, IT security, etc. etc. preferably involving free software. Q: what do you need? A: money to pay rent and food. at the ABSOLUTE MINIMUM, i need as little as £1500 per month to pay everything, and have been earning approx £800 per month for the past year. a £5000 inheritance last year which i was not expecting has delayed eviction and bankruptcy for me and my family, and deportation for my partner and 17 month old daughter (marie is here in the UK on a FLR/M visa) Q: why are you asking here? A: because it's urgent that i get money really really soon; my family members are refusing to assist, and the few friends that i have do not have any spare money to lend. Q: why here and not monster jobs or python-jobs list or the various recruitment agencies? A: those are full-time employment positions, which i have been frequently applying for and get rejected for various reasons, and i'm running out of time and money. further interviews cost money, and do not result in guaranteed work. i need work - and money - _now_. Q: why here and not peopleperhour.com? A: if you've ever bid on peopleperhour.com you will know that you are bidding against offshore contrators and even being undercut by 1st world country bidders who, insanely, appear to be happy to do work for as little as £2 / hour. Q: why are you getting rejected from interviews? A: that's complex. a) i simply don't interview well. people with the classic symptoms of asperger's just don't. b) my daughter is 17 months old. when i go away for as little as 3 days, which i've done three times now, she is extremely upset both when i am away and when i return. i think what would happen if i was doing some sort of full- time job, away from home, and... i can't do it. subconsciously that affects how i react when speaking to interviewers. Q: why do you not go get a job at tesco's or drive a truck? A: tescos and HGV driving etc. pay around £12 per hour. £12 per hour after tax comes down to about £8 to £9 per hour. £9 per hour requires 35 hours per week to earn as little as £1500. 35 hours per week is effectively full-time, and means that a) my programming and software engineering skills are utterly, utterly wasted b) my daughter gets extremely upset because i won't be at home. so you get the gist, and thank you for putting up with me needing to take this action. For the sake of your family, I'd recommend taking the following paragraphs off your cv: If you require someone whom you do NOT want to take the initiative to assess all aspects of the required work and beyond; if you require someone who will stay in the box, do NOT contact me. The speed at which I acquire new knowledge and be able to integrate and recommend new ideas tends to make insecure people feel frightened and threatened. Pet Hates: - peer to peer networking [peer equals neanderthal...] - microsoft marketing machine [FUD at its best...] - restrictive anti-competitive business practices - information-restricive laws [DMCA etc.] - Unreliable systems that cannot be made to do the job you really needed done yesterday... I'd also recommend updating the links on
Re: looking for open source python project
looking for a python project (preferably something a bit small) that is looking for contributors. the small bit is because i've never worked in a team before and haven't really read source code that's 1000s of lines long, so i'm not too sure i can keep up. my python fu is decent (i think), i recently wrote a small archive/ grimoire program (command line only) that can store multiline text with title, tags, and basic search functionality (not using curses so the entry, once entered, can't be modified), entries are stored in a pickle file. anybody have any suggestions? i'm keen to work on something with others, both for learning and i'd like to do something a bit meaningful, plus i'm sure it's fun. Have a look at http://wiki.python.org/moin/CodingProjectIdeas Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: pypy
Just curious if anyone had the chance to build pypy on a 64bit environment and to see if it really makes a huge difference in performance. Would like to hear some thoughts (or alternatives). I'd recommend asking about this on the pypy mailing list or looking at their documentation first; see http://codespeak.net/pypy/dist/pypy/doc/ HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Save/load like matlab?
I wonder if there is a way to save and load all python variables just like matlab does, so I can build a code step by step by loading previous states. I am handling a python processing code for very large files and multiple processing steps. Each time I find a bug, I have to run the whole thing again, which is time consuming. Perhaps pickle is the thing you are looking for? http://docs.python.org/library/pickle.html HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
path to data files
If a python module requires a data file to run how would I reference
this data file in the source in a way that does not depend on whether
the module is installed system-wide, installed in $HOME/.local or is
just placed in a directory from where the interpreter is fired up? I'd
like to always keep the python source and the data file in the same
directory, be it /usr/lib/python2.6/site-packages,
$HOME/.local/lib/python2.6/site-packages or
/arbitrary/path/to/somewhere.
If the data file is called 'foo' and I simply do open('foo') in the
python source file this will not work if they are both installed
either system-wide or locally. More precisely if the module is called
'foo.py', data file called 'foo', they are both in
/usr/lib/python2.6/site-packages and if foo.py I have open('foo') I'll
get a file not found error.
Any ideas?
Cheers,
Daniel
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Re: path to data files
If a python module requires a data file to run how would I reference this data file in the source in a way that does not depend on whether the module is installed system-wide, installed in $HOME/.local or is just placed in a directory from where the interpreter is fired up? I'd like to always keep the python source and the data file in the same directory, be it /usr/lib/python2.6/site-packages, $HOME/.local/lib/python2.6/site-packages or /arbitrary/path/to/somewhere. open(os.path.join(os.path.dirname(__file__), 'foo')) Thanks a lot! Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: how to save a whole web page with something block
I want to save a web page. I use urllib to parse the web page. But I find the saved file, where some content is missing. The missing part is block from the original web page, such as this part div style=display: block; id=GeneInts.../div.I don't know how to parse a whole page without something block in it. Could you help me figure it out? Thank you! This is my program url = 'http://receptome.stanford.edu/hpmr/SearchDB/getGenePage.asp? Param=4502931ProtId=1ProtType=Receptor' f = urllib.urlretrieve(url,'test.html') A web server may present different output depending on the client used. When you use your browser to look at the source and then use urllib's saved file you access the web server with different clients. I'm not saying this is your problem, but potentially it is. So you might want to make urllib appear as a browser by sending the appropriate headers. HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Smith-Waterman Algorithm in Python
Every one of the first 20 entries is either the OP questions or your reply. And you think it was there before the OP sent his message? Oh wait, did you just invent a time machine? :) Daniel - you are no help at all, and no funny. Actually, I'm damn funny! :) I have noticed before that people who post without searching first end up polluting subsequent searches. Google obviously boosts the rank of recent pages. This is one of the three major reasons stackoverflow and friends were developed. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Smith-Waterman Algorithm in Python
Does any one about any implementation of classical Smith Waterman local alignment algorithm and it's variants for aligning natural language text? Please see http://tinyurl.com/2wy43fh Every one of the first 20 entries is either the OP questions or your reply. And you think it was there before the OP sent his message? Oh wait, did you just invent a time machine? :) Daniel - you are no help at all, and no funny. Actually, I'm damn funny! :) Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Smith-Waterman Algorithm in Python
Does any one about any implementation of classical Smith Waterman local alignment algorithm and it's variants for aligning natural language text? Please see http://tinyurl.com/2wy43fh Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Why is there no platform independent way of clearing a terminal?
After getting the technicalities out of the way, maybe I should have asked: Is it only me or others would find a platform independent python API to clear the terminal useful? There are two kinds of programs: 1. Those that process input to output. If one of those suddenly started by clearing my screen, I'd just dump it. Also, if output is redirected to a file or piped into another program, that is basically useless or even hurting, since you then end up with control sequences in the file. 2. Those that provide a text-based interactive UI. Those typically not only clear the screen, but also control its whole layout and content, so there you don't only need ways to clear the screen but also to position the cursor or draw boxes etc. In that case you need a full curses library. Summary: No, I don't see the need for such an API. Okay, that makes perfect sense, thanks for the exaplanation! I'll just live with the platform.system( ) check for this particular problem then. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Why is there no platform independent way of clearing a terminal?
After getting the technicalities out of the way, maybe I should have asked: Is it only me or others would find a platform independent python API to clear the terminal useful? I don't know much, but just in case the following is useful to anyone: There is a Windows program called 'ansicon', which when installed (run with '-i'), will modify all future Windows cmd shells to correctly intercept and interpret ANSI escape codes for colors, cursor movement, and: \e[#J ED: Erase Display which I presume is what is under discussion here. I understand there are other historical ANSI drivers which were responsible for achieving a similar thing under Windows, but this is the method I currently use (on XP) and am very happy with. Also, and probably less usefully, personally I do wish Python provided a cross platform mechanism for simple terminal control like clearing and colored text. Since ANSI codes are used everywhere except Windows, it would make sense to base such a system on them. So I started a pure Python implementation of a crude ANSI driver, on PyPI as 'colorama'. It does nothing on non-windows systems, but on Windows it patches sys.stdout with a stream-like object, in order to filter out ANSI codes and convert them into Win32 terminal control calls. It currently only works with colors and brightness, but I would love to extend it to cover other ANSI codes such as 'clear screen'. It is doubtless riddled with errors and misunderstandings, and I would love any feedback helping me do a better job. Thanks, I didn't know about 'colorama' before but it surely looks promising! I'll look into it for future reference, once in a while I like having pretty output without the hassle of 'curses' or other complicated stuff. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Why is there no platform independent way of clearing a terminal?
Hi folks, If I'm only interested in linux and windows I know I can do import os import platform if platform.system( ) == 'Linux': clear = 'clear' else: clear = 'cls' os.system( clear ) or something equivalent using os.name and friends, but was wondering why there is no platform independent way (i.e. the platform dependence is taken care of by the python stdlib) of clearing a terminal. Sure, there are many different terminals and many different operating systems but in many areas python managed to hide all these complexities behind a well defined API. Why was clearing a terminal left out? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Why is there no platform independent way of clearing a terminal?
Hi folks, If I'm only interested in linux and windows I know I can do import os import platform if platform.system( ) == 'Linux': clear = 'clear' else: clear = 'cls' os.system( clear ) or something equivalent using os.name and friends, but was wondering why there is no platform independent way (i.e. the platform dependence is taken care of by the python stdlib) of clearing a terminal. Sure, there are many different terminals and many different operating systems but in many areas python managed to hide all these complexities behind a well defined API. Why was clearing a terminal left out? What you're talking about is a shell, not a terminal (a terminal is a physical device). And the shell is not necessarily part of the OS itself (there's no shortage of shells for unices / linux systems), so it doesn't belong to the os or platform modules. FWIW, I can't tell for sure since I never used any other shell than bash, but I'm not sure your above code is garanteed to work on each and any possible unix shell. Sorry, but that is completely wrong - the shell is irrelevant. clear is just a normal command line program that queries the termcap/terminfo database (possibly via the curses library) for the terminal specific sequence of characters that will clear the screen. It then writes those characters to stdout. The terminal, or (more usually these days) terminal emulator, then interprets those characters and takes the appropriate action. I'm not sure what the POSIX status of the clear command is, but I'd be surprised if it wasn't present on a UNIX/Linux system of any vintage. After getting the technicalities out of the way, maybe I should have asked: Is it only me or others would find a platform independent python API to clear the terminal useful? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: detect endianness of a binary with python
Something like the file utility for linux would be very helpfull. Any help is appreciated. You're going to have to describe in detail what's in the file before anybody can help. We are creating inside our buildsystem for an embedded system a cram filesystem image. Later on inside our build process we have to check the endianness, because it could be Little Endian or big endian (arm or ppc). The output of the file tool is for a little endian cramfs image: ourImage: Linux Compressed ROM File System data, little endian size 1875968 version #2 sorted_dirs CRC 0x8721dfc0, edition 0, 462 blocks, 10 files It would be possible to execute ret = os.system(file ourImage | grep little endian) and evaluate the return code. But I don't like to evaluate a piped system command. If there is an way without using the os.system command this would be great. Please see http://pypi.python.org/pypi/python-magic HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: source install of python2.7 and rpm install of cx_Oracle collision
I make installed python 2.7 from source, and also installed the RPM version of cx_Oracle for python 2.7. But ldd tells me : #ldd cx_Oracle.so libpython2.7.so.1.0 = not found I find out that only libpython2.7.a generated when I install python2.7, who can tell me what I need to do ? I want a libpython2.7.so.1.0 generated when I install python. I am not familiar with GCC and .so .a stuff. In this case I'd recommend removing the source install of python 2.7, install it from rpm, followed by installing cx_Oracle from rpm. HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] inflect.py: generate plurals, ordinals, numbers to words...
I'm pleased to announce the release of inflect.py v0.1.8, a module that correctly generates: * the plural of singular nouns and verbs * the singular of plural nouns * ordinals * indefinite articles * present participles * and converts numbers to words Which languages does it support? If the answer is what I expect it is, It is. Most of the time, when people forget to say what they are talking about, assuming that they are either US-Americans or Windows users will hit the nail on the head. And most of the time, when people are bitching about US-Americans, assuming that they are Europeans will hit the nail on the head :) Duck-and-run-ly yours, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] inflect.py: generate plurals, ordinals, numbers to words...
I'm pleased to announce the release of inflect.py v0.1.8, a module that correctly generates: * the plural of singular nouns and verbs * the singular of plural nouns * ordinals * indefinite articles * present participles * and converts numbers to words Which languages does it support? If the answer is what I expect it is, It is. Most of the time, when people forget to say what they are talking about, assuming that they are either US-Americans or Windows users will hit the nail on the head. And most of the time, when people are bitching about US-Americans, assuming that they are Europeans will hit the nail on the head :) In this case, I actually should modify the above to: when people are bitching about an English speaker they don't like for some reason and they automatically think that said person must be US-American when in fact he/she is Australian (or British or South African or something else), assuming that they are Europeans will hit the nail on the head :) Duck-and-run-even-faster-ly yours, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: how to install all python plugins
I`m using ubuntu 10.04 I want to install all the python plugins at once or the python plugins list. thank you in advance What is a python plugin? If you mean all published packages on the python website, then you probably don't really want to install all of them, only those that you need. If you mean all python packages that are available through the package manager of ubuntu, then you'll need to search the entire list of available packages using ubuntu's package manager, pick out the ones that have 'python' in their names (presumably, this is how it works on fedora) and install them using the above mentioned package manager software. If you don't know how to use it, please see https://help.ubuntu.com/community/SynapticHowto https://help.ubuntu.com/community/InstallingSoftware HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] inflect.py: generate plurals, ordinals, numbers to words...
I'm pleased to announce the release of inflect.py v0.1.8, a module that correctly generates: * the plural of singular nouns and verbs * the singular of plural nouns * ordinals * indefinite articles * present participles * and converts numbers to words Wow! Tons of kudos, this must have been hell of a work to put together with all the irregular nouns/verbs/etc, and I really needed something like this for a long time. Thanks a lot, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: eGenix at EuroPython 2010
EuroPython 2009 - Making 50 Mio. EUR per year using Python http://www.egenix.com/go23/ This link returns a 404. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Python script to install python
I would like to have a python script that would download the most recent svn of python, configure, make, install and cleanup after itself. I am not replacing the python version I would be using to run the script. I was struggling to get this to work and I assume someone else has done it better. Any pointers? Assuming you are on linux I recommend not using a python script for this but rather a shell script. From a python script you would most of the time be calling shell commands anyway. In a shell script you would do something like this: #!/bin/bash svn checkout cd whatever ./configure --whatever-options-you-like make # you probably want to run this as root make install # you probably don't want to be root anymore cd .. rm -rf whatever If you are on windows I assume a similar strategy is best. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3 - Is PIL/wxPython/PyWin32 supported?
I don't know that PIL or wxPython supports Python 3 or not. May with some trick these packages are working. Does anybody know about it? Can I replace my Py2.6 without lost PIL/wxPython? PIL currently does not support python 3 but release 1.1.7 will in the future. Don't ask me when, I don't know. I have no idea about the rest. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Twisted 10.1.0 released
On behalf of Twisted Matrix Laboratories, I am honored to announce the release of Twisted 10.1.0. Highlights include: * Deferreds now support cancellation * A new endpoint interface which can abstractly describe stream transport endpoints such as TCP and SSL * inotify support for Linux, which allows monitoring of file system events. * AMP supports transferring timestamps Note also that this is the *last* supported release of Twisted for Python 2.4 on Windows. For more information, see the NEWS file. It's stable, backwards compatible, well tested and in every way an improvement. Download it now from: http://tmrc.mit.edu/mirror/twisted/Twisted/10.1/Twisted-10.1.0.tar.bz2 http://tmrc.mit.edu/mirror/twisted/Twisted/10.1/Twisted-10.1.0.winxp32-py2.5.msi http://tmrc.mit.edu/mirror/twisted/Twisted/10.1/Twisted-10.1.0.winxp32-py2.6.msi Many thanks to Glyph Lefkowitz, who helped do the release preparation, and the PyCon 2010 sprinters, who did so much of the work for this release. The twisted website at http://twistedmatrix.com/ seems to be having issues (trac can not connect to its database?). Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Build unordered list in HTML from a python list
I have this python list that represets a sitemap:
tree = [{'indent': 1, 'title':'Item 1', 'hassubfolder':False},
{'indent': 1, 'title':'Item 2', 'hassubfolder':False},
{'indent': 1, 'title':'Folder 1', 'hassubfolder':True},
{'indent': 2, 'title':'Sub Item 1.1', 'hassubfolder':False},
{'indent': 2, 'title':'Sub Item 1.2', 'hassubfolder':False},
{'indent': 1, 'title':'Item 3', 'hassubfolder':False},
{'indent': 1, 'title':'Folder 2', 'hassubfolder':True},
{'indent': 2, 'title':'Sub Item 2.1', 'hassubfolder':False},
{'indent': 2, 'title':'Folder 2.1', 'hassubfolder':True},
{'indent': 3, 'title':'Sub Item 2.1.1', 'hassubfolder':False},
{'indent': 3, 'title':'Sub Item 2.1.2', 'hassubfolder':False},
]
From that list I want to create the following HTML code:
ul id=tree
liItem 1/li
liItem 2/li
liFolder 1
ul
liSub Item 1.1/li
liSub Item 1.2/li
/ul
/li
liItem 3/li
liFolder 2
ul
liSub Item 2.1/li
liFolder 2.1
ul
liSub Item 2.1.1/li
liSub Item 2.1.2/li
/ul
/li
/ul
/li
/ul
If an item of the list has 'True' for the 'hassubfolder' key than a new
ulli must be created instead of /li after its title. (See
Folder 2 node in the HTML code above.
My problem is: How do I keep track of the closing tags while iterating
over the python list?
Elementtree has already been mentioned as a solution, but if you need
something more lightweight, give markup.py a try:
http://markup.sourceforge.net/ it's a single module and very easy to
use for the sort of things you are after.
Cheers,
Daniel
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Re: Using Python for web applications
Sorry for asking such a simple (or possibly complicated) question, as I am new to Python programming. Anyways, I have read online that many popular websites use Python for some of their web-based applications (for example, Reddit), and that lead me to wonder how is this done? There are various options, the simplest is using a full blown web framework which simplifies about 90% of the work and you only need to code the logic related to your app. Two of the most popular frameworks are django [1] and turbogears [2]. You can also go more low level by designing your own framework from scratch which is something the bigger shops are doing like youtube. In any case there is a wiki page that you might find useful [3]. HTH, Daniel [1] http://www.djangoproject.com/ [2] http://www.turbogears.org/ [3] http://wiki.python.org/moin/WebProgramming -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: web application in django
I'm doing web application in django in which I have to make search option that will find on other web page some product(for example) and that product will have to been seen on my page.. now I don't know where to start with programming.. I know I must parse that other page but I don't have idea how to do that.. can someone help me with understanding what I have to do exactly?! First fetch the page using urllib2 [1] then parse it with elementtree [2] or beautiful soup [3] or something else [4]. Once you filtered out the data you want you can insert it where ever you need to insert it. Be sure to read this also [5]. HTH, Daniel [1] http://docs.python.org/library/urllib2.html [2] http://docs.python.org/library/xml.etree.elementtree.html [3] http://www.crummy.com/software/BeautifulSoup/ [4] http://wiki.python.org/moin/PythonXml [5] http://catb.org/esr/faqs/smart-questions.html -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] adding new function
how can i simply add new functions to module after its initialization (Py_InitModule())? I'm missing something like PyModule_AddCFunction(). This type of question really belongs to python-list aka comp.lang.python which I CC-d now. Please keep the discussion on that list. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Vote to Add Python Package pubsub to the Python Standard Library
I vote for adding the Python package pubsub to the Python standard library. It has recently been added to wxpython (replacing the old wx.lib.pubsub package), but it has application to non-gui programs as well. For more information see: http://pubsub.sourceforge.net/. If you are really interested in this the minimum would be following these steps: 1. discuss various publish-subscribe API variants on python-list (aka c.l.p) 2. when you got tons of feedback summarize the discussion on python-dev 3. tons of feedback will follow and try to converge on a consensus concerning the API 4. write a PEP 5. produce an implementation (or get someone to do it) 6. add the implementation to the PEP 7. lobby for acceptance of the PEP A good example for the first couple of stages of this process is PEP 3143 concerning adding a daemon package to the stdlib: http://www.python.org/dev/peps/pep-3143/ I haven't found the beginning of the thread discussing this but you can start for example here: http://mail.python.org/pipermail/python-list/2009-March/1197808.html Good luck, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: What's the largest python/django powered website in the world?
just curious, what's the largest python powered website in the world? I'm afraid you'll need to define what you mean by python powered. If the server side of a web application is written in 3 or more languages and one of them is python, does that count? If yes, then probably google and youtube are the largest python powered websites. Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Does pickled objects work fine between different OS?
If I dump a Python dictionary into a file named data.pkl using Pickle module on a Linux operating system, will the data contained in data.pkl load fine in a Windows OS? Yes. I mean will I be able to load the dictionary data contained in data.pkl just fine on Windows XP? Yes. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
