Re: Xah's edu corner: the Journey of Foreign Characters thru Internet
So just stop talking. It's funny that you guys are having a conversations about not responding to a guys post. First of all, freedom of speech, blah blah, who cares, just let him alone. But certainly don't go on his post, reply, telling people not to reply. That's like saying EVEN THOUGH I'M doing this, YOU should not do it. JUST STOP ALREADY :-). There is of course, the option...instead of starving the troll...FEED HIM TILL HE BURSTS! == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: Most efficient way of storing 1024*1024 bits
BTW, it'd be 6 megabits or 750kb ;) Six megabytes is pretty much nothing on a modern computer. == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: computer programming
what is .tk? Turkmenistan? or is it just some arbitrary suffix. www.javaholics.tk == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: coloring a complex number
I'm not 100% sure about this, but from what it seems like, the reason
method B worked, and not method a is because class foo(complex) is
subclassing a metaclass. So if you do this, you can't init a meta class
(try type(complex), it equals 'type' not 'complex'. type(complex())
yields 'complex'), so you use the new operator to generator a class on
the fly which is why it works in method B. I hope that's right.
-Brandon
Spending the morning avoiding responsibilities, and seeing what it would
take to color some complex numbers.
class color_complex(complex):
def __init__(self,*args,**kws):
complex.__init__(*args)
self.color=kws.get('color', 'BLUE')
a=color_complex(1,7)
print a
(1+7j) #good so far
a=color_complex(1,7,color='BLUE')
Traceback (most recent call last):
File pyshell#37, line 1, in -toplevel-
a=color_complex(1,7,color='BLUE')
TypeError: 'color' is an invalid keyword argument for this function
No good... it seems that I am actually subclassing the built_in function
'complex' when I am hoping to have been subclassing the built_in numeric
type - complex.
but some googling sends me to lib/test/test_descr.py
where there a working subclass of complex more in
accordance with my intentions.
class color_complex(complex):
def __new__(cls,*args,**kws):
result = complex.__new__(cls, *args)
result.color = kws.get('color', 'BLUE')
return result
a=color_complex(1,7,color='BLUE')
print a
(1+7j)
print a.color
BLUE
which is very good.
But on the chance that I end up pursuing this road, it would be good if
I understood what I just did. It would certainly help with my
documentation ;)
Assistance appreciated.
NOTE:
The importance of the asset of the depth and breadth of Python archives
- for learning (and teaching) and real world production - should not be
underestimated, IMO. I could be confident if there was an answer to
getting the functionality I was looking for as above, it would be found
easily enough by a google search. It is only with the major
technologies that one can hope to pose a question of almost any kind to
google and get the kind of relevant hits one gets when doing a Python
related search. Python is certainly a major technology, in that
respect. As these archives serve as an extension to the documentation,
the body of Python documentation is beyond any normal expectation.
True, this asset is generally better for answers than explanations.
I got the answer I needed. Pursuing here some explanation of that answer.
Art
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Re: C Extension - return an array of longs or pointer?
All the veteran programmers out there can correct me, but the way I did
it in my extension was this:
static PyObject *wrap_doNumberStuff(PyObject* self, PyObject* args)
{
char* in = 0;
char* x = 0;
long* result = 0;
int i = 0;
PyObject* py = PyTuple_New()
int ok = PyArg_ParseTuple(args,ss,in, x);
if(!ok) return NULL;
result = doNumberStuff(in,x):
len = sizeof(result)/sizeof(long)
for(i;i len; i++)
PyTuple_SET_ITEM(py, i,Py_BuildValue(l,*result[i])
}
Simple enough idea...i'm not quite sure if I've done everything
correctly with the pointers, but I'm sure you can figure that out, the
algorithm is simple enough.
Hi,
I have been posting about writing a C extension for Python...so far,
so good. At least for the simple functions that I need to wrap.
Ok, my c function looks like...
MY_NUM *doNumberStuff(const char *in, const char *x) { ... }
MY_NUM is defined as, typedef unsigned long MY_NUM; (not sure if that
matters, or can i just create a wrapper which handles longs?)
anyhow..for my wrapper I have this..
static PyObject *wrap_doNumberStuff(PyObject *self, PyObject args) {
char *in = 0;
char *x = 0;
long *result = 0;
int ok = PyArg_ParseTuple(args, ss, in, x);
if (!ok) return 0;
result = doNumberStuff(in, x);
return Py_BuildValue(l, result);
}
...my question is...in the c code, result is a pointer to an array of
longs, how can I get the returned result to be a list or something
similar to an array in Python?
...I also have a function which returns a character array (denoted by a
char *)...would it work the same as the previous question?
Thanks!!
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Re: C Extension - return an array of longs or pointer?
I'm sorry...I just woke up and forgot my C...must have left it in the
Coffee...Anyway, i made a few mistakes (can't initialize blank
tuple...function should return a value, lol).
static PyObject* wrap_doNumberStuff(PyObject* self, PyObject* args)
{
char* in = 0;
char* x = 0;
long* result = 0;
int i = 0;
PyObject* py = NULL;
if(!PyArg_ParseTuple(args,ss,in,x) return NULL;
result = doNumberStuff(in,x);
len = sizeof(result)/sizeof(long);
py = PyTuple_New(len);
for(i; i len; i++)
PyTuple_SET_ITEM(py, i, Py_BuildValue(l,*result[i]);
return py;
}
Additionally, the Python/C api in the docs tells you all of these nifty
little abstract layer functions that you can call from your extension.
All the veteran programmers out there can correct me, but the way I did
it in my extension was this:
static PyObject *wrap_doNumberStuff(PyObject* self, PyObject* args)
{
char* in = 0;
char* x = 0;
long* result = 0;
int i = 0;
PyObject* py = PyTuple_New()
int ok = PyArg_ParseTuple(args,ss,in, x);
if(!ok) return NULL;
result = doNumberStuff(in,x):
len = sizeof(result)/sizeof(long)
for(i;i len; i++)
PyTuple_SET_ITEM(py, i,Py_BuildValue(l,*result[i])
}
Simple enough idea...i'm not quite sure if I've done everything
correctly with the pointers, but I'm sure you can figure that out, the
algorithm is simple enough.
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Re: Windows installer, different versions of Python on Windows
When you install Python it plug entries into the registry, so that when you go to install add-ons that are pre-compiled binaries, they look into the registry for the python directory. If you can find out how to manipulate the registry so that the binaries would recognize different installations, you'd be good to go. This would probably involve having copies of the same key with different values. I would like to install several copies of Python 2.4.2 on my machine, but it doesn't seem to be possible. If I allready has a version installed, the installer only gives the options to: - change python 2.4.2 - repair python 2.4.2 - remove python 2.4.2 I would like to install different versions of Zope 3, and since it is installed under a specific python version, the simplest solution would be to install several Python versions, and install a different zope3 version under each python install. Have I misunderstood something here? == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Confused on Kid
Hey, so I heard about the TurboGears posting and decided to investigate. I watched some of their video on building a wiki in 20 minutes and was totally blown away because I'm used to python...straight python, not melding together 4 different APIs into one to blah blah. ANYWAY. I was investigating each subproject individually and could not, for the life of me figure out how Kid worked. I understand that it takes a well-formed XML document and transforms it, but I could not figure out where it transforms it, or how to transform a document. They have plenty of template examples, but I'm left say, What do I do with this? I know I can't just pop in it a browser because it has no sort of style sheet or anything so it would just render as an XML document. What do you do after you have a kid template? == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: new forum -- homework help/chit chat/easy communication
Hrm...i find it demeaning to relegate Python to a scripting language while Visual Basic is in the software development section. Python so outdoes VB in every way shape and form. I've launched a new forum not too long ago, and I invite you all to go there: www.wizardsolutionsusa.com (click on the forum link). We offer all kinds of help, and for those of you who just like to talk, there's a chit chat section just for you...Just remember that forum communication is much easier, safer, and faster. == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: new forum -- homework help/chit chat/easy communication
[EMAIL PROTECTED] wrote: I've launched a new forum not too long ago, and I invite you all to go there: www.wizardsolutionsusa.com (click on the forum link). We offer all kinds of help, and for those of you who just like to talk, there's a chit chat section just for you...Just remember that forum communication is much easier, safer, and faster. [.section Blurb] About me: My name is James (Cantley) Sheppard. I am a North Carolina resident, at the age of 16. I have been programming since the age of 12, and enjoy it as lifes[sic] greatest passion. In the future, I would love to become the leading Software Engineer at a fairly large company, and maybe someday own my own business. As of right now, I am currently in high school and planning on going to a four year college somewhere around the country. Well, that is my life story, and about all I got to say! [.section Commentary] Hrm, obviously hasn't had enough programming experience in 4 years to quite know what he's talking about. Before making random assertions James, you might want to take into account the community you're talking to. I don't know about you guys, but I've had enough teen start up webpages. They clog the web. No offense of course to the younger readers, its just...it's like E/N sites...junk most of the time. == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: new forum -- homework help/chit chat/easy communication
In other words, what is the difference between a scripting language and a programming language. Good point. == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: recursive function
Is there no way to implement your idea in a classical loop? Usually the syntax is cleaner, and there is no limit (except the limit of the range function in certain cases). For example what would be wrong with. def foo(j): while j n: j+=1 return j I don't know much about the internals of python, but to me it seems like if you're going to be doing this on the level of 1000s of iterations, there might be some overhead to using recursion (i.e. function calls) that a loop wouldn't have (but that's just a guess). Hello, In a recursive function like the following : def foo( j ) : j += 1 while j n : j = foo( j ) return j in found that the recursivity is limited (1000 iterations). Then, I have two questions : - why this mecanism has been implemented ? - it is possible to increase or remove (and how) the number of iterations ? Regards, Mathieu == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: recursive function
def foo(j): while j n: j+=1 return j of course I mean: def foo(j): while j n: j+=1 return j sorry == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: Help with chaos math extensions.
Well, I didn't buy it JUST to compile python extensions, I'm looking to write C++ apps as well, I just use python for a lot of math and science simulations, and I got VS .NET at heavy discount since I'm a student. Brandon K wrote: In case you missed it, I said I have windows XP. Windows XP pre-compiled python binaries are built on VS .NET 2003. In order to build extensions, you need the compiler the interpreter was built on, or at least that is what is reported to me by calling setup.py. If I was using linux, which I currently am not, it'd be a different story. Additionally, GCC isn't available for windows XP, only MinGW, the port, and I don't know that much about it to use it running on a Windows platform. Furthermore, I was asking for help on an extension, not an economical question about my programming environment. Thanks On Oct 4, 2005, at 10:25 PM, Brandon Keown wrote: I have programmed a fractal generator (Julia Set/Mandelbrot Set) in python in the past, and have had good success, but it would run so slowly because of the overhead involved with the calculation. I recently purchased VS .NET 2003 (Win XP, precomp binary of python 2.4.2rc1) to make my own extensions. Why did you need to purchase anything when gcc is available for free? Since gcc isn't an option, the logical way to proceed would be to do what others have done and install the Microsoft Toolkit compiler, available from their web site for the outrageous price of nothing. I can vouch that it really does compile extensions for Python 2.4 on Windows, having done that myself. See http://www.vrplumber.com/programming/mstoolkit/ regards Steve == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: Absolultely confused...
If I take out the ! in the format string and just use O, I can at least get past PyArg_ParseTuple. Is this a compile-time error? Or a runtime error? == Posted via Newsgroups.com - Usenet Access to over 100,000 Newsgroups == Get Anonymous, Uncensored, Access to West and East Coast Server Farms! == Highest Retention and Completion Rates! HTTP://WWW.NEWSGROUPS.COM == -- http://mail.python.org/mailman/listinfo/python-list
Re: Help with chaos math extensions.
In case you missed it, I said I have windows XP. Windows XP pre-compiled python binaries are built on VS .NET 2003. In order to build extensions, you need the compiler the interpreter was built on, or at least that is what is reported to me by calling setup.py. If I was using linux, which I currently am not, it'd be a different story. Additionally, GCC isn't available for windows XP, only MinGW, the port, and I don't know that much about it to use it running on a Windows platform. Furthermore, I was asking for help on an extension, not an economical question about my programming environment. Thanks On Oct 4, 2005, at 10:25 PM, Brandon Keown wrote: I have programmed a fractal generator (Julia Set/Mandelbrot Set) in python in the past, and have had good success, but it would run so slowly because of the overhead involved with the calculation. I recently purchased VS .NET 2003 (Win XP, precomp binary of python 2.4.2rc1) to make my own extensions. Why did you need to purchase anything when gcc is available for free? --- Andrew Gwozdziewycz [EMAIL PROTECTED] http://ihadagreatview.org http://plasticandroid.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Help with chaos math extensions.
Here's the Script it was being used in (forgive it if it seems a bit
messy, i have been tinkering with variables and such to try different
ideas and haven't really cleaned it up).
import ctest
import Tkinter
import threading
hue_map =
("#FF","#FEFEFF","#FDFDFF","#FCFCFF","#FBFBFF","#FAFAFF","#F9F9FF","#F8F8F8","#F7F7FF","#F6F6F6","#FF","#FF","#FF","#FF","#FF","#FF","#FF",\
"#FF","#FF","#FF","#FF","#FF","#FF","#FF","#FF")
class Mandelbrot_Set(Tkinter.Canvas):
def __init__(self,master,iters):
Tkinter.Canvas.__init__(self,master)
self.dims = {'x':500,'y':500}
self.config(height=self.dims['y'],width=self.dims['x'])
self.r_range = (-2.0,2.0)
self.i_range = (-2.0,2.0)
self.iters = iters
self.prec =
{'r':1.*(self.r_range[1]-self.r_range[0])/(self.dims['x']),'i':1.*(self.i_range[1]-self.i_range[0])/self.dims['y']}
self.escapemap
=
ctest.escapeMap(-1j,self.iters,(self.dims['x'],self.dims['y']),(self.r_range[0],self.r_range[1]),(self.i_range[0],self.i_range[1]))
self.select = False
self.select_event = (0,0)
self.sbox = None
self.bind("Button-1",self.selection_box)
self.bind("Motion",self.select_update)
self.t_draw = threading.Thread(target=self.draw)
self.t_draw.start()
def draw(self):
for j in range(self.dims['y']):
i = 0
while i self.dims['x']:
cur = 0;
try:
color = self.escapemap[j][i]
while self.escapemap[j][i+cur] == color:
cur+=1
except IndexError:
break;
hue_step = 1.*len(hue_map)/self.iters
if color == -1: f = "#00"
else: f = hue_map[int(hue_step*color)]
self.create_line(i,j,i+cur,j,fill=f)
i+=cur
def selection_box(self,event):
if not self.select:
self.select_event = (event.x,event.y)
self.select = True
else:
self.r_range = self.new_range(event.x,self.select_event[0])
self.i_range = self.new_range(event.y,self.select_event[1])
print self.r_range,self.i_range
self.select = False
self.delete(Tkinter.ALL)
self.t_draw.run()
self.select_update(event)
def new_range(self,x,y):
if x y:
return (y,x)
else:
return (x,y)
def select_update(self,event):
if not self.select:
return
else:
if self.sbox != None:
self.delete(self.sbox)
self.sbox =
self.create_rectangle(self.select_event[0],self.select_event[1],event.x,event.y,fill=None,outline="#00")
else:
self.sbox =
self.create_rectangle(self.select_event[0],self.select_event[1],event.x,event.y,fill=None,outline="#00")
if __name__ == "__main__":
root = Tkinter.Tk()
c = Mandelbrot_Set(root,50)
c.pack()
root.mainloop()
The error occurs in the instantiation of the Mandelbrot_Set object.
Additionally in little mini timing scripts such as
import time
import ctest
t = time.time()
c = ctest.escapeMap(-1j,100,(500,500))
print time.time()-t
this will crash it too
however I found that just opening up the interpreter and typing
import ctest
ctest.escapeMap(-1j,100,(50,50)) #50 yields much
smaller output than 500x500
it generates a 2d tuple fine. So the error seems really obscure to me,
and I don't understand it.
Brandon Keown wrote:
I have programmed a fractal generator (Julia Set/Mandelbrot Set) in
python in the past, and have had good success, but it would run so
slowly because of the overhead involved with the calculation. I
recently purchased VS .NET 2003 (Win XP, precomp binary of python
2.4.2rc1) to make my own extensions. I was wondering if anyone could
help me figure out why I'm getting obscure memory exceptions (runtime
errors resulting in automatic closing of Python) with my extension. It
seems to run okay if imported alone, but when accompanied in a list of
instructions such as a function it crashes.
a short script or interpreter session that illustrates how to get the errors
would help.
/F
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Re: Extending Python
I own Python in a Nutshell, as one person pointed out. Alex Martelli does a great job of introducing the concepts, as long as your'e familiar with C. Additionally he covers wrapping (which is sounds like you're trying to do) with SWIG, Pyrex, and a few other options. It's a great book, I have used no other (save python docs) after my introduction. I am looking for a good tutorial on how to extend python with C code. I have an application built in C that I need to be able to use in Python. I have searched through various sources, starting of course with the Python site itself, and others, but I felt a bit lacking from the Python site, it seems it was only made for those who installed the source distribution, as for the other people... Anyways, thanks for the help! -- http://mail.python.org/mailman/listinfo/python-list
