Re: sending bytes to parallel port
fd = open('/dev/ppi0','w')
fcntl.ioctl(fd.fileno(),'PPISCTRL',1000)
Traceback (most recent call last):
File stdin, line 1, in ?
TypeError: an integer is required
i guess i'm failing to properly define the int i need for the 8byte
value ineed to send the port to set pins high /low
Python doesn't know about PPISCTRL - it has no way of knowing all
secret, OS-specific constants for ioctl-calls.
So, you need to figure out the numeric value of that constant .- look it
up in the appropriate header-file.
Then, you do have the next problem with passing that 1000 value of
yours. ioctl expects strings or buffers as parameters which contain a
byte-representation of the value you want to set. This is an snippet I
use to read the event device capabilities under linnux:
buf = array.array('c', [' ' for i in xrange(EV_MAX / 8 + 1)])
fcntl.ioctl(self._fd, EVIOCGBIT(0, len(buf)), buf, True)
caps = struct.unpack(I, buf)[0]
HTH,
Diez
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Re: sending bytes to parallel port
Diez B. Roggisch wrote:
fd = open('/dev/ppi0','w')
fcntl.ioctl(fd.fileno(),'PPISCTRL',1000)
Traceback (most recent call last):
File stdin, line 1, in ?
TypeError: an integer is required
i guess i'm failing to properly define the int i need for the 8byte
value ineed to send the port to set pins high /low
Python doesn't know about PPISCTRL - it has no way of knowing all
secret, OS-specific constants for ioctl-calls.
So, you need to figure out the numeric value of that constant .- look it
up in the appropriate header-file.
Then, you do have the next problem with passing that 1000 value of
yours. ioctl expects strings or buffers as parameters which contain a
byte-representation of the value you want to set. This is an snippet I
use to read the event device capabilities under linnux:
buf = array.array('c', [' ' for i in xrange(EV_MAX / 8 + 1)])
fcntl.ioctl(self._fd, EVIOCGBIT(0, len(buf)), buf, True)
caps = struct.unpack(I, buf)[0]
HTH,
Diez
*sigh*
if only pyparallel would install
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Re: sending bytes to parallel port
*sigh* if only pyparallel would install *sigh* If only you said _what_ failed we could maybe help you make it work... :) Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: How to find difference in years between two dates?
John Machin wrote:
I don't understand. The examples that I showed went from the last day
of a month to the last day of another month. [...]
Q1: is ((date-4days)+4days) == date?
Q2: is (((date-4days)+1month)+4days) == date+1month?
Ok, let's use Python'ish syntax (including numbering the days from 0
upwards, and backwards from -1, the last day of the month), you want
the last day of a month plus a month be the last day of the next
month. Simplistically, something like:
month[-1] + 1 month == (month+1)[-1] {last-to-last}
but that's obviously not the entire rule you want, unless 4-30 + 1
month == 5-31? So you would also like to have:
month[i] + 1 month = (month+1)[i] {lock-step}
we'd like yesterday to be a day ago? So for suitable i:
month[i] - 1 day == month[i-1] {yesterday-1}
month[0] - 1 day == (month-1)[-1] {yesterday-2}
which leads to a natural definition for when tomorrow is:
month[i] + 1 day == month[i+1] {tomorrow-1}
month[-1] + 1 day == (month+1)[0]{tomorrow-2}
So far so good. Now let's count backwards:
month[-1] - 1 day == month[-2] by: yesterday-1
month[-2] - 1 day == month[-3] by: yesterday-1
month[-3] - 1 day == month[-4] by: yesterday-1
etc.
In other words, if you insist that the last day of the month is a well
defined concept and you want a day ago to be yesterday then month[-4],
the forth-to-last day of the month, is necessarily also well
defined. Having a well defined month[i], I'll apply your rules for
adding a month:
month[-4] + 1 month == (month+1)[-4] by: last-to-last
but you don't like this, because that means that e.g.:
april[-4] + 1 month == may[-4]
april[27] + 1 month == may[28]
which in addition to {lock-step}:
april[27] + 1 month == may[27]
either gives an inconsistent, ill-formed, or FUZZY system (although
I would call it regular ;-)
My approach is simpler since it doesn't define addition, only
subtraction on valid dates, so if I switch to representing dates as
(month, day):
(a, b) - (c, d) := a - c iff b d {subtract}
else a - c - 1
{subtract} is irregular but well defined for all valid dates (it will
always give you an answer, and it's always the same answer ;-) :
(2,29) - (1,31) == 0
(3,1) - (1,31) == 2
I can add day addition and still be ok:
(m,d) + 1 day := (m,d+1){tomorrow-1}
(m,-1) + 1 day := (m+1,0) {tomorrow-2}
(m,d) - 1 day := (m,d-1) {yesterday-1}
(m,0) - 1 day := (m-1,-1) {yesterday-2}
Now my system is well-formed and consitent, even though it is
irregular, and it will answer yes to Q1 above. I can't see a way of
adding month addition to this and stay consistent without enumerating
special cases for every month, so Q2 can't even be asked in my system.
You're entitled to your opinion.
And you to yours :-)
Ok, I've explained why I hold mine... You care to do the same?
-- bjorn
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Re: sending bytes to parallel port
Diez B. Roggisch wrote:
*sigh*
if only pyparallel would install
*sigh* If only you said _what_ failed we could maybe help you make it
work... :)
Diez
titan# python setup.py install
running install
running build
running build_py
Traceback (most recent call last):
File setup.py, line 19, in ?
package_data = data_files
File /usr/local/lib/python2.4/distutils/core.py, line 149, in setup
dist.run_commands()
File /usr/local/lib/python2.4/distutils/dist.py, line 946, in
run_commands
self.run_command(cmd)
File /usr/local/lib/python2.4/distutils/dist.py, line 966, in
run_command
cmd_obj.run()
File /usr/local/lib/python2.4/distutils/command/install.py, line
506, in run
self.run_command('build')
File /usr/local/lib/python2.4/distutils/cmd.py, line 333, in run_command
self.distribution.run_command(command)
File /usr/local/lib/python2.4/distutils/dist.py, line 966, in
run_command
cmd_obj.run()
File /usr/local/lib/python2.4/distutils/command/build.py, line 112,
in run
self.run_command(cmd_name)
File /usr/local/lib/python2.4/distutils/cmd.py, line 333, in run_command
self.distribution.run_command(command)
File /usr/local/lib/python2.4/distutils/dist.py, line 965, in
run_command
cmd_obj.ensure_finalized()
File /usr/local/lib/python2.4/distutils/cmd.py, line 117, in
ensure_finalized
self.finalize_options()
File /usr/local/lib/python2.4/distutils/command/build_py.py, line
60, in finalize_options
self.data_files = self.get_data_files()
File /usr/local/lib/python2.4/distutils/command/build_py.py, line
120, in get_data_files
filenames = [
File /usr/local/lib/python2.4/distutils/command/build_py.py, line
128, in find_data_files
globs = (self.package_data.get('', [])
AttributeError: 'NoneType' object has no attribute 'get'
titan#
--
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Re: HERE I BUILT A QUICK MATRIX TOOOK 5 MINS
Grant Edwards [EMAIL PROTECTED] wrote: | On 2006-07-28, Paul McGuire [EMAIL PROTECTED] wrote: | ...USING A INFINITE MAGENTIC | FIELD!!! | | I have a vision of a sweeping magenta fabric rippling through the cosmos. | | Perhaps a mauvic, cyanic, or even aubergenic field would be more stylish. | | depends on what shoes you choose to go with it. | | -- | Grant Edwards grante Yow! My uncle Murray | at conquered Egypt in 53 |visi.comB.C. And I can prove |it too!! I find myself in the unenviable position that I can no longer remember the colour of magic as expressed in Terry Pratchett's books - was it something like Octarine? - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: How to force a thread to stop
Paul Rubin http://[EMAIL PROTECTED] Writes: | H J van Rooyen [EMAIL PROTECTED] writes: | *grin* - Yes of course - if the WDT was enabled - its something that | I have not seen on PC's yet... | | They are available for PC's, as plug-in cards, at least for the ISA | bus in the old days, and almost certainly for the PCI bus today. That is cool, I was not aware of this - added to a long running server it will help to make the system more stable - a hardware solution to hard to find bugs in Software - (or even stuff like soft errors in hardware - speak to the Avionics boys about Neutrons) do you know who sells them and what they are called? - Sorry if this is getting off topic on this thread... ( in a way it is on topic - because a reset will stop a thread every time...) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: How to force a thread to stop
Dennis Lee Bieber [EMAIL PROTECTED] wrote: | On Fri, 28 Jul 2006 08:27:18 +0200, H J van Rooyen | [EMAIL PROTECTED] declaimed the following in comp.lang.python: | | | Dennis - did your OS not have a ticker running? | | That ancient machine, while round-robin, multi-priority, | pre-emptive, seemed still to only deliver signals on deliberate | blocking calls -- perhaps to prevent potential corruption if the signal | had been delivered(handled) in the middle of some multi-instruction | sequence. The OS level would see the ctrl-c, and set the signal bit | in the task header -- but without the blocking I/O (typically), the code | to activate a registered signal handler would not be invoked. Operation | was something like: submit I/O request, AND(signal bits, signal mask) -- | invoke handler if non-zero, block for I/O return [or return directly for | asynchronous I/O request] - Hah! - so it *could* have responded - it just chose not to - so it was pre emptive - but hey - what is different between modern OS's and what you are describing? - it seems to me that there is just a lot of extra memory control, as well as control over who is allowed to do what - in an effort to make things more stable - and all this stuff just eats cycles and slows you down... (or alternatively, makes the hardware more complex and expensive...) But to get back to the OP's problem - basically the thread has to see some sort of variable change, or receive a message (by examining something to see if there is a message there) and then kill itself, or the OS must be told to stop giving control back to the thread in question - which option will leave all the loose ends in the thread loose... So its either: hey mr nice thread please stop - or hey Mr OS - kill that thread ... - now from the OS viewpoint - if the application implements some threading itself - it may not even know that the thread exists - OS threads are known variously as Tasks or Processes or Running Programmes - so using the big guns on a thread may not be possible without killing the parent too... So if you want to use the OS to kill the thread - it has to be a formal OS thread - something started with a call to the OS, and not something that an application implements by itself - and I am not familiar enough with Python threading and dummy threading to pretend to know what is under the hood - but I haven't seen an additional process appearing on my Linux box when I start a thread - so its either something that Python does on its own without registering the new thread with Linux - or I haven't looked closely enough... So if somebody else can take over here, we might convince the OP that hey mr nice thread is the way to go, even in the case that the thread in question is an OS Process - after all - there has to be inter - task communication in any case - so the cleanest solution is to build the kill in right from scratch... Why do I think of COBOL: read master_file_record at end go to end_routine HTH - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: sending bytes to parallel port
Timothy Smith [EMAIL PROTECTED] wrote: | Grant Edwards wrote: | On 2006-07-28, Timothy Smith [EMAIL PROTECTED] wrote: | | | i've been trying to send an 8 byte string to my parallel port | under freebsd. the purpose is it to control a relay board. the | board simply responds to the output byte coming from the port. | eg. 0001 will set pin 1 high and flick the relay open. | todate i've attempted this with merely open() on /dev/ppi0 and | numpy for the byte array, but i just can't seem to get it | working. i know the parallel port works and i know the relay | board works (tested it with it's own windows ultility) so it's | just my crappy programming keeping me from success. | | | I'm guessing there's an implied request for help there | somewhere. This would be a good start: | |http://www.google.com/search?q=python+parallel+port | | I'd particularly recommend taking a look at the pyparallel | module found here: | |http://pyserial.sourceforge.net/ | | I've not used pyparallel, but based on my experience with | pyserial and some of Chris Liechti's other work, I'd bet | dollars to doughnuts it's your best option. | | | yes, i did try pyparallel however it will not install on freebsd, | setup.py errors. | | and yes i've done quite a bit of googling, i never expected it to be | this difficult. i've done work with serial ports before. never parallel but. What is on the other side of the link? - if its a small 8 bit micro - you may simply be going too fast... - Hendrik | -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
On Saturday 29 July 2006 03:43, Nick Vatamaniuc wrote: Aptitude, are you still using that? Just use Synaptic on Ubuntu. The problem as I wrote in my post before is that for some IDEs you don't just download an executable but because they are written for Linux first, on Windows you have to search and install a lot of helper libraries that often takes quite a bit of time. And why do you want to spend half an hour searching for stuff when you can do just spend 1 minute in a nice graphical installer or use apt-get install on the command line to install it. I am using Ubuntu primarily because it has the .deb system which I found to be much better mentained and which deals with dependecies a lot better. Nick V. Synaptic is using aptitude as back-end (this is serious). I also find deb system being the best. Managed with aptitude, not apt. Windows is definitely worth the effort. Best Regards, Rob -- http://mail.python.org/mailman/listinfo/python-list
Re: metaclass : parse all class once before doing anything else ?
Laurent Rahuel schrieb: I got a metaclass named Foo I have the impression that you are not talking about a meta-class, but a normal class here. Then I got two others classes: class Bar(Foo): pass class Baz(Foo): pass I know how to add some attrs, methods to Bar and Baz when the module is loaded but I need to do something more : Before adding anything to these classes, 1 - I need to parse all defined Foo classes 2 - sort them 3 - parse this sorted list to add attrs and methods. This seems to be really to clever for me ;-( Any idea ? Why do you want to do this? It is in that way not possible - python has no preprocessing step that would allow this. I suggest you explain to us what you are after here, and then we might come up with a solution. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
In [EMAIL PROTECTED], Rob Sinclar wrote: Synaptic is using aptitude as back-end (this is serious). Why can I deinstall aptitude without deinstalling synaptic then!? Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: How to force a thread to stop
H J van Rooyen [EMAIL PROTECTED] writes: That is cool, I was not aware of this - added to a long running server it will help to make the system more stable - a hardware solution to hard to find bugs in Software - (or even stuff like soft errors in hardware - speak to the Avionics boys about Neutrons) do you know who sells them and what they are called? - I usually try froogle.com to find stuff like that. -- http://mail.python.org/mailman/listinfo/python-list
Re: HERE I BUILT A QUICK MATRIX TOOOK 5 MINS
I find myself in the unenviable position that I can no longer remember the colour of magic as expressed in Terry Pratchett's books - was it something like Octarine? AFAIK yes. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
Synaptic is using aptitude as back-end (this is serious). No. It uses apt. I also find deb system being the best. Managed with aptitude, not apt. Windows is definitely worth the effort. aptitude as well as synaptic both depend transitive upon debconf, which depends on apt. Use apt-cache dotty synaptic to explore the dependency-graph. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: How to force a thread to stop
| A common recovery mechanism in embedded systems is a watchdog timer, | which is a hardware device that must be poked by the software every | so often (e.g. by writing to some register). If too long an interval | goes by without a poke, the WDT hard-resets the cpu. Normally the | software would poke the WDT from its normal periodic timing routine. | A loop like you describe would stop the timing routine from running, | eventually resulting in a reset. *grin* - Yes of course - if the WDT was enabled - its something that I have not seen on PC's yet... The intel 810 chipset (and all after that) has a builtin watchdog timer - unfortunetally on some motherboards it's disabled (I guess in the BIOS). How do I know that? Once I got Linux installed on a new machine and although the install went without a problem, after the first boot the machine would reboot on exactly 2 minutes. After a bit of poking around I found that hotplug detected the WDT support and loaded the driver for it (i8xx_tco), and it seems the WDT chip was set to start ticking right away after the driver poked it. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: metaclass : parse all class once before doing anything else ?
Laurent Rahuel wrote: Hi, I have a much to smart problem for my brain. Here is the deal : I got a metaclass named Foo Then I got two others classes: class Bar(Foo): pass class Baz(Foo): pass I know how to add some attrs, methods to Bar and Baz when the module is loaded but I need to do something more : Before adding anything to these classes, 1 - I need to parse all defined Foo classes 2 - sort them 3 - parse this sorted list to add attrs and methods. This seems to be really to clever for me ;-( Any idea ? Regards, Laurent. I, like Diez am unsure of why you would need what you have asked for, but maybe this will help. You can keep track of all instances of a class by this kind of thing: class C1(object): ... inst = [] ... def __init__(self): ... self.inst.append(self) ... i1 = C1() i2 = C1() print i1,i2 __main__.C1 object at 0x0128C970 __main__.C1 object at 0x0128CA50 print C1.inst [__main__.C1 object at 0x0128C970, __main__.C1 object at 0x0128CA50] -- http://mail.python.org/mailman/listinfo/python-list
testing for data type
Hi Listers, I have a requirement to test for a data type could someone tell me if this is possible in python? Basically I have a ZPT in Zope that users can select checkboxes in a form which pass arguments for a python function, however if there is only one checkbox selected it is passed as a string whereas more than one checkbox is passed as a list. Therefore if my function is required to perform an action based on each argument passed in the list the function works correctly but if it is passed as a string nothing happens. This is my function: selecteddeptcodes = context.REQUEST.DEPTCODE currentstatus = context.REQUEST.STATUS if currentstatus == 'pending': for dptcd in selecteddeptcodes: context.changetolive(DEPTCODE=dptcd) if currentstatus == 'old': for dptcd in selecteddeptcodes: context.changetopending(DEPTCODE=dptcd) return context.pub_dept_form(context, context.REQUEST, message='Updated Status') The argument in question is selecteddeptcodes. I tried to make my function conditional based on the length of the argument passed but if its just one checkbox value passed the length of the argument is 2 (which is the number of chars passed in the string) and if there are two checkboxes the length of the argument (which is the number of items in the list) is also 2. So that doesnt help. Any assistance would be appreciated. Jon -- http://mail.python.org/mailman/listinfo/python-list
Partial Classes - Aspects
I'm currently writing a small toy application to support symbolic algebra. Therefore I implemented some classes Term, Var, Number, Sum, Product, Power. These classes are tightly coupled. So it is not possible to organize them in distinct files. This would result in cyclic imports. To manage the complexity I implemented some sort of aspect oriented programming (perhaps aspect oriented programming is not quite right in this context...). That is I implemented a mechanism to dynamically add methods to existing classes. This is similar to the thread Partial classes discussed in this list. Therefore hereby offer some use case for partial classes. The aspects I already implemented are amongst others: pretty printing, differentiation, expansion of terms. The aspect for expansion looks like this: # -*- coding: iso-8859-1 -*- __aspect__ = Expand class TermExpand: def expand(self): return self class SumExpand: def expand(self): ... def expandSum(term, sum): # some helper function ... class ProductExpand: def expand(self): ... class PowerExpand: def expand(self): ... The code to import an aspect into existing classes accepts as a parameter the name of a module. The module will be imported. Afterwards the code iterates over all elements defined in the module. If it is a (specially named) class all methods will be copied to the original class. If it is a (top level) function it will be copied into the global namespace. E.g. the method expand of the class TermExpand will be copyied to the base class Term. The difficulty with this approach is that the classes' methods and the functions do operate in the wrong global namespace. Since these functions/methods are located in their own module they get their own namespace. To correct this I have to use new.function() to create new methods/functions with the correct namespace (which is the base module's namespace). So my questions boil down to this: * Do you think this is a sound approach to structure my code? * I don't like the necessity to modify the functions. Is there a simpler approach? Thanks, Peer -- http://mail.python.org/mailman/listinfo/python-list
Re: Comma is not always OK in the argument list?!
Nick Vatamaniuc wrote:
True, that is why it behaves the way it does, but which way is the
correct way? i.e. does the code need updating or the documentation?
Perhaps, someone can make a bug report... IMHO, docs are wrong.
-Roman
-Nick V.
[EMAIL PROTECTED] wrote:
Nick Vatamaniuc wrote:
Roman,
According to the Python call syntax definition
(http://docs.python.org/ref/calls.html) commas should be allowed, so it
seems like a minor bug. Here are the lines in question:
-http://docs.python.org/ref/calls.html---
call ::= primary ( [argument_list [,]] )
argument_list::=positional_arguments [, keyword_arguments] [, *
expression] [, ** expression]
| keyword_arguments [, * expression] [, ** expression]
| * expression [, ** expression]
| ** expression
--
If you notice in the 'call' definition, no matter what the
'argument_list' is, it can be followed by an optional ',' right before
the closing ')'. Your code is a counterexample to this. Here is a more
exhaustive example:
Actually, in the real BNF it's not allowed:
http://svn.python.org/view/python/trunk/Grammar/Grammar?rev=46209view=markup
parameters: '(' [varargslist] ')'
varargslist: ((fpdef ['=' test] ',')*
('*' NAME [',' '**' NAME] | '**' NAME) |
fpdef ['=' test] (',' fpdef ['=' test])* [','])
fpdef: NAME | '(' fplist ')'
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Re: Need a compelling argument to use Django instead of Rails
On Sat, 29 Jul 2006 04:07:12 GMT, Tim Roberts [EMAIL PROTECTED] wrote: Exactly. The Python interpreter can take a significant fraction of a second to start. For the typical short web request, the overhead can add up. On the other hand, unless you're handling dozens of requests per minute, users are unlikely to notice. You can also keep session state in memory instead of spilling to disk, and you can keep database sessions open. Thanks for the explanations. -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
Synaptic is using aptitude as back-end (this is serious). Why can I deinstall aptitude without deinstalling synaptic then!? Ciao, Marc 'BlackJack' Rintsch Hi, This is because Aptitude is an independant console application that is very useful to users working on linux machines without X server installed. Synaptic is the interface which leads the underlying application. Synaptic is often installed with a $ aptitude install synaptic Best Regards, Rob -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
Sybren Stuvel wrote: Vincent Delporte enlightened us with: I'm thinking of using Python to build the prototype for a business web appplication. Why just the prototype? I don't know about Vincent, but I once worked in a C++ shop where all other languages were actively discouraged. I would build my prototypes in Python to show proof of concept because I could do it quickly. It was also nice to show project managers so they could verify it was what they wanted us to build before we dedicated a full time effort to development. I recall once prototype I created in wxWindows; when I showed it to my boss he exclaimed That's Python!?. He was amazed because it looked just like the windows apps we developed! Having moved on to another company where we develop in Python full-time, I hear my former shop now has many Python (and Perl and Java) programmers. -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
In [EMAIL PROTECTED], Rob Sinclar wrote: Synaptic is using aptitude as back-end (this is serious). Why can I deinstall aptitude without deinstalling synaptic then!? This is because Aptitude is an independant console application that is very useful to users working on linux machines without X server installed. I know what aptitude is… Synaptic is the interface which leads the underlying application. …but I ask why I can deinstall it and still use synaptic if it's using aptitude as back-end as you seriously claim!? Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Fastest Way To Loop Through Every Pixel
nikie wrote: Chaos wrote: As my first attempt to loop through every pixel of an image, I used for thisY in range(0, thisHeight): for thisX in range(0, thisWidth): #Actions here for Pixel thisX, thisY But it takes 450-1000 milliseconds I want speeds less than 10 milliseconds Milliseconds don't mean much unless we knew how big your images are and what hardware you're using. Have you considered using NumPy? Assuming you can get the image into a numpy array efficiently, the actual algorithm boils down to something like this: grey = r*0.3 + g*0.59 + b*0.11 index = grey.argmin() x,y = index%step, index/step v = grey[x,y] where r,g,b and grey are numpy.ndarray objects; The arithmetic operators and the argmin-function are implemented in C, so you can expect decent performance. (the 4 lines above take about 80 ms for a 1000x1000 image on my PC) If that's not enough, you might want to use some specially optimized C library for this purpose. (I'd suggest Intel's IPP, but there are others). Can you give me an example of geting an image into a numpy array? -- http://mail.python.org/mailman/listinfo/python-list
Re: Fastest Way To Loop Through Every Pixel
nikie wrote: Chaos wrote: As my first attempt to loop through every pixel of an image, I used for thisY in range(0, thisHeight): for thisX in range(0, thisWidth): #Actions here for Pixel thisX, thisY But it takes 450-1000 milliseconds I want speeds less than 10 milliseconds Milliseconds don't mean much unless we knew how big your images are and what hardware you're using. Have you considered using NumPy? Assuming you can get the image into a numpy array efficiently, the actual algorithm boils down to something like this: grey = r*0.3 + g*0.59 + b*0.11 index = grey.argmin() x,y = index%step, index/step v = grey[x,y] where r,g,b and grey are numpy.ndarray objects; The arithmetic operators and the argmin-function are implemented in C, so you can expect decent performance. (the 4 lines above take about 80 ms for a 1000x1000 image on my PC) If that's not enough, you might want to use some specially optimized C library for this purpose. (I'd suggest Intel's IPP, but there are others). I really do not understand the code. Where did you get the varibales r, g, b and step and what does v produce? -- http://mail.python.org/mailman/listinfo/python-list
Re: non-blocking PIPE read on Windows
placid [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Hi all, I have been looking into non-blocking read (readline) operations on PIPES on windows XP and there seems to be no way of doing this. Ive read that you could use a Thread to read from the pipe, but if you still use readline() wouldnt the Thread block too? http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440554 What i need to do is, create a process using subprocess.Popen, where the subprocess outputs information on one line (but the info continuesly changes and its always on the same line) and read this information without blocking, so i can retrieve other data from the line i read in then put this in a GUI interface. readline() blocks until the newline character is read, but when i use read(X) where X is a number of bytes then it doesnt block(expected functionality) but i dont know how many bytes the line will be and its not constant so i cant use this too. Any ideas of solving this problem? Cheers I realized something very similar to what you described in http://sourceforge.net/projects/bestgui - the subprocess2.py module realizes the non blocking I/O - the outputparser.py module processes the output from the controlled process and updates the progress-bar, the status-bar and the log messages in the GUI. Incomplete lines are stored in a buffer and processed at the next read. ciao -- Antonio Valentino -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG -- http://mail.python.org/mailman/listinfo/python-list
Re: Comma is not always OK in the argument list?!
Roman,
The way I see it, it could be either way. In other words if I can
write f(1,2,3) and f(1,2,3,) I should also be able to write
f(1,*[2,3],). It is a really small detail but there sould be some
consistency. Either no extra commas for all kinds of argument types or
extra commas for _all_ of them. It seems though also that if it is
possible to do it with lists, tuples and dictionaries, it should also
be possible to do it with argument lists. In other words if (1,2,3,)
makes sense so should func(1,2,3,) even when written as
func(1,2,*[3],).
Well you are the one who discovered this so you shoud be the one
submitting the bug report! Here is PEP 3 page with the guidelines for
bug reporting:
http://www.python.org/dev/peps/pep-0003/
Just mark it as a very low priority since it is more of a cosmetic bug
than a serious showstopper.
-Nick V
Roman Susi wrote:
Nick Vatamaniuc wrote:
True, that is why it behaves the way it does, but which way is the
correct way? i.e. does the code need updating or the documentation?
Perhaps, someone can make a bug report... IMHO, docs are wrong.
-Roman
-Nick V.
[EMAIL PROTECTED] wrote:
Nick Vatamaniuc wrote:
Roman,
According to the Python call syntax definition
(http://docs.python.org/ref/calls.html) commas should be allowed, so it
seems like a minor bug. Here are the lines in question:
-http://docs.python.org/ref/calls.html---
call ::= primary ( [argument_list [,]] )
argument_list::=positional_arguments [, keyword_arguments] [, *
expression] [, ** expression]
| keyword_arguments [, * expression] [, ** expression]
| * expression [, ** expression]
| ** expression
--
If you notice in the 'call' definition, no matter what the
'argument_list' is, it can be followed by an optional ',' right before
the closing ')'. Your code is a counterexample to this. Here is a more
exhaustive example:
Actually, in the real BNF it's not allowed:
http://svn.python.org/view/python/trunk/Grammar/Grammar?rev=46209view=markup
parameters: '(' [varargslist] ')'
varargslist: ((fpdef ['=' test] ',')*
('*' NAME [',' '**' NAME] | '**' NAME) |
fpdef ['=' test] (',' fpdef ['=' test])* [','])
fpdef: NAME | '(' fplist ')'
--
http://mail.python.org/mailman/listinfo/python-list
Re: Client/Server Question
[EMAIL PROTECTED] wrote: Is os.system() going to be deprecated in future ?.I read somewhere. [...] Sometime in the future it will. But that won't happen soon. Read the second paragraph of Backwards Compatibility in the subprocess PEP http://www.python.org/dev/peps/pep-0324/. Dennis -- http://mail.python.org/mailman/listinfo/python-list
system programign
may i use python to read a file and output its content to another file which is not created yet and i don't want to use to do this in linux? how do you do ? oqestra. -- http://mail.python.org/mailman/listinfo/python-list
=?utf-8?Q?Re:_ANN:_4_New_ShowMeDo.com_Videos_=28Wing_IDE, _RUR=2DPLE_=282=29, _PataPata=29?=
I'll be out of the office until approximately August 20th. If you have any questions, please email [EMAIL PROTECTED] -- David Wahler -- http://mail.python.org/mailman/listinfo/python-list
Re: system programign
In [EMAIL PROTECTED], oqestra wrote:
may i use python to read a file and output its content to another file
which is not created yet and i don't want to use to do this in
linux?
Read the documentation about `open()`. Simple example:
in_file = open('old.txt', 'r')
out_file = open('new.txt', 'w')
for line in in_file:
out_file.write(line)
in_file.close()
out_file.close()
how do you do ?
I'm fine, thanks. ;-)
Ciao,
Marc 'BlackJack' Rintsch
--
http://mail.python.org/mailman/listinfo/python-list
install python on cdrom
Hi, I look for an easy way to use the newest scipy, pyvtk, matplotlib, f2py, numpy, paraview/vtk,... on a entreprise redhat machine without administration rights. My first thought was to install the whole new python system on a cdrom/dvd and mounting it, when I need it. Would that be the easiest way? I would be glad to read some hints about the way doing it... Greetings! Fabian -- http://mail.python.org/mailman/listinfo/python-list
Re: Client/Server Question
[EMAIL PROTECTED] wrote:
My server.py looks like this
-CODE--
#!/usr/bin/env python
import socket
import sys
import os
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = 2000
s.bind((host,port))
s.listen(1)
conn, addr = s.accept()
print 'client is at', addr
while True:
data = conn.recv(100)
if (data == 'MaxSim'):
print 'MaxiSim'
os.system('notepad')
elif (data == 'Driving Sim'):
print 'Driving Sim'
os.system('explorer')
elif (data == 'SHUTDOWN'):
print 'Shutting down...'
os.system('shutdown -s')
conn.close()
break
---CODE
END-
I am running this above program on a windows machine. My client is a
Linux box. What I want to achieve is that server.py should follows
instructions till I send a 'SHUTDOWN' command upon which it should shut
down.
When I run this program and suppose send 'MaxSim' to it, it launches
notepad.exe fine, but then after that it doesn't accept subsequent
command.
As others noted, that's because os.system() blocks.
You have more bugs than that.
The recv() might return MaxiSimDriving Sim. It could return
MaxiS on one call, and im on the next. If the remote side
closes the connection, recv() will keep returning the empty
string, and your program will be stuck in an infinite loop.
Did you understand Faulkner's suggustion? Anyone who connects to
TCP port 2000 can invoke shutdown -s (which I assume shuts down
your host).
--
--Bryan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Nested function scope problem
On 2006-07-29, Dennis Lee Bieber [EMAIL PROTECTED] wrote: On 28 Jul 2006 17:48:03 GMT, Antoon Pardon [EMAIL PROTECTED] declaimed the following in comp.lang.python: That is no reason to say that python has no variables. If someone would explain the difference between objects in some other language and objects in python I wouldn't accept the statement: python has no objects either. Python objects can exist without a variable bound to them... Though typically such would soon be garbage collected G Well C++ objects can exist without a variable bound to them. We just call them memory leaks G Traditional languages are the other way around... If a variable exists, it may exist with no object/value (ie, it is uninitialized -- a big problem in C). What do you call traditional? Lisp is about as old as Fortran AFAIK. Python names can not exist (and be used) without being bound to some object (even None is a defined object). Attempting to use a name that has not been bound gives you the unbound local type problem. Yes, some other languages do define special flag values so that they can detect the usage of an uninitialized item... But the variable itself exists regardless; you can not detach the object from the variable (except by assigning something else to the variable). I'm not so sure Python is that different. The fact that you get an UnboundLocalError, instead of a NameError, suggests that in the first case, the 'variable' already exists but is bound to a Not yet Bound value. Not so long ago I was discussing some implementation details of CPython and someone then said that all local variables are entered into the local scope at call time. This was to prevent the language to find variables that are shadowed on a more global scope because the local variable wasn't boud yet. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: Nested function scope problem
On 2006-07-28, Gerhard Fiedler [EMAIL PROTECTED] wrote: On 2006-07-28 15:20:52, Antoon Pardon wrote: Typically, variable implies a data storage location that can take on different values. Emphasis on location -- the name is fixed to a memory location whose contents can be varied. That is not true. It may be the case in a number of languages but my experience with lisp and smalltalk, though rather limited, says that no such memory location is implied with the word variable in those languages and AFAIK they don't have a problem with the word variable either. In Python, the closest would be a mutable object. Maybe this gets somewhere. Consider variable != constant. Python names are variables in that what they refer to (what is associated with them through a dict) can be changed, through various means (most commonly assignment). They are also variables in that what they refer to (usually) can be changed. Whether an assignment or some other command changes the reference association or the referenced object is one of the confusing issues with Python. But that doesn't make a variable less variable... :) I think the important thing to remember is that the assignment in Python is a alias maker and not a copy maker. In languages like C, Fortran, pascal, the assignment makes a copy from what is on the righthand and stores that in the variable on the lefthand. In languages like Lisp, Smalltalk and Python, the assignment essentially makes the lefthand an alias for the righthand. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: Nested function scope problem
On 2006-07-29, Dennis Lee Bieber [EMAIL PROTECTED] wrote:
On 28 Jul 2006 18:20:52 GMT, Antoon Pardon [EMAIL PROTECTED]
declaimed the following in comp.lang.python:
That is not true. It may be the case in a number of languages but
my experience with lisp and smalltalk, though rather limited,
says that no such memory location is implied with the word variable
in those languages and AFAIK they don't have a problem with the
word variable either.
I have no smalltalk experience, and my lisp goes back to a cassette
based version on a TRS-80 Model III...
Since, at that time at least, everything in lisp was a
tree-branching linked list I had trouble even considering setq to define
a variable -- it was closer to adding a name to a node of the lists...
G {Yes, that IS a very loose interpretation}
Does lisp permit one object to have multiple variables attached to
it -- that is, two or more names on one object (whatever the node
contains)...
AFAIK, yes
And if so, what happens if, say, the object had been a
scalar value 3.14159265436 perhaps and you make an assignment to one
of the names?
About the same as happens in Python. One name will then be attached to
a new value and the other names will still be attached to 3.14159265436
--
Antoon Pardon
--
http://mail.python.org/mailman/listinfo/python-list
Smaple of recursive directory walker
Hello, At work I have a directory of about 50 large text files and i need to search thru them for 10 separate words and print how many were found in total. I am new to python so could somebody please show me some sample code that would help me get this done and i will work from that. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: sending bytes to parallel port
On 2006-07-29, Timothy Smith [EMAIL PROTECTED] wrote: I'd particularly recommend taking a look at the pyparallel module found here: yes, i did try pyparallel however it will not install on freebsd, setup.py errors. Ah. I guess freebsd wasn't one of the systems listed on the pyparallel page -- I should have paid closer attention. and yes i've done quite a bit of googling, i never expected it to be this difficult. i've done work with serial ports before. never parallel but. Serial ports on PCs are pretty standardized as 16550 UARTs, and The Unix serial port API was mostly nailed down years ago. There are at least three different schemes for parallel ports, and not everybody implements those identically even if they do claim to be one of the three. Many motherboard chipsets claim to do do all three. On top of that, there doesn't seem to be a common Unix prallel port API. -- Grant Edwards grante Yow! Is this ANYWHERE, at USA? visi.com -- http://mail.python.org/mailman/listinfo/python-list
Re: War chest for writing web apps in Python?
Nick Vatamaniuc schreef: I found Komodo to be too slow on my machine, SPE was also slow, was crashing on me and had strange gui issues, I hope you didn't install SPE from the MOTU repositories with synaptic or apt-get. I use SPE myself daily on Ubuntu and wrote this howto install SPE on Ubuntu: http://www.ubuntuforums.org/showthread.php?t=218001highlight=wxpython I know that others are running SPE on Ubuntu without problems. The main point is not to use SPE from the repositories, but from the SPE website. If the howto is too much just download the -nosetup.zip Stani -- http://pythonide.stani.be -- http://mail.python.org/mailman/listinfo/python-list
Re: Nested function scope problem
On 2006-07-29 13:47:37, Antoon Pardon wrote: I think the important thing to remember is that the assignment in Python is a alias maker and not a copy maker. In languages like C, Fortran, pascal, the assignment makes a copy from what is on the righthand and stores that in the variable on the lefthand. In languages like Lisp, Smalltalk and Python, the assignment essentially makes the lefthand an alias for the righthand. Yes, I think I got it now :) It seems that, in essence, Bruno is right in that Python doesn't really have variables. Everything that seems variable doesn't really change; what changes is that an element of what seems to change gets rebound. Which in itself is a rebinding process of a dictionary... I have yet to go there and see whether anything at all changes :) Gerhard -- http://mail.python.org/mailman/listinfo/python-list
Proposal for new option -U extending -u
Currently -u specifies that stdin, stdout and stderr are all unbuffered. I propose a that -U make all files unbuffered. It could be useful for programs that log to files. Comments solicited. -- http://mail.python.org/mailman/listinfo/python-list
Math package
I want to write a program which would have a 2 dimensional array of 1 billion by 1 billion. This is for computational purposes and evaluating a mathematical concept similar to Erdos number. Which is the best package for such programs (that would be fast enough). Every help is appreciated. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Smaple of recursive directory walker
At work I have a directory of about 50 large text files and i need to
search thru them for 10 separate words and print how many were found
in total.
I am new to python so could somebody please show me some sample code
that would help me get this done and i will work from that.
Assuming it's primarily the directory walk you need help with,
something like the following should help:
for root, dirs, files in os.walk('~/mydir'):
for file in [f for f in files if f.endswith(.txt)]:
fh = open(file)
for line in fh:
# Search for words.
fh.close()
--
http://mail.python.org/mailman/listinfo/python-list
Re: Smaple of recursive directory walker
yes this is great i will work from that but how can i use say a list
to pass 10 words?
mylist = ['word1','word2','word3','word4']
On 29 Jul 2006 12:01:03 -0700, Ant [EMAIL PROTECTED] wrote:
At work I have a directory of about 50 large text files and i need to
search thru them for 10 separate words and print how many were found
in total.
I am new to python so could somebody please show me some sample code
that would help me get this done and i will work from that.
Assuming it's primarily the directory walk you need help with,
something like the following should help:
for root, dirs, files in os.walk('~/mydir'):
for file in [f for f in files if f.endswith(.txt)]:
fh = open(file)
for line in fh:
# Search for words.
fh.close()
--
http://mail.python.org/mailman/listinfo/python-list
Re: Math package
I think you need one of these: http://www-03.ibm.com/servers/deepcomputing/bluegene.html Don't know if it runs python. If that doesn't work try to reformulate your problem and have a look at http://scipy.org/ Cheers, Bas [EMAIL PROTECTED] wrote: I want to write a program which would have a 2 dimensional array of 1 billion by 1 billion. This is for computational purposes and evaluating a mathematical concept similar to Erdos number. Which is the best package for such programs (that would be fast enough). Every help is appreciated. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Math package
In [EMAIL PROTECTED], diffuser78 wrote: I want to write a program which would have a 2 dimensional array of 1 billion by 1 billion. This is for computational purposes and evaluating a mathematical concept similar to Erdos number. Lets say you just want a byte at each cell in that array: You have: (1 billion)^2 bytes You want: terabyte * 100 / 1e-06 Hope you have enough memory. ;-) Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Math package
[EMAIL PROTECTED]: I want to write a program which would have a 2 dimensional array of 1 billion by 1 billion. This is for computational purposes and evaluating a mathematical concept similar to Erdos number. Maybe you are talking about the edges of a graph with 1e9 nodes. This structure is surely quite sparse, so you don't need to store the edges in a matrix, you can manage is as a sparse structure, and maybe you don't need a Blue Gene. If you find ways to clean your data, reduce the vertex and arc count, and if you have a lot of memory, then maybe Boost Graph for Python may suffice: http://www.osl.iu.edu/~dgregor/bgl-python/ Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Proposal for new option -U extending -u
James Thiele wrote: Currently -u specifies that stdin, stdout and stderr are all unbuffered. I propose a that -U make all files unbuffered. It could be useful for programs that log to files. Comments solicited. '-U' is already taken (for unicode only strings). Other than that I have no opinion (don't think I'd use it...). All the best, Fuzzyman http://www.voidspace.org.uk/python/index.shtml -- http://mail.python.org/mailman/listinfo/python-list
Re: Math package
I will write the problem a little more clearer so that you guys can recommend me better. In a graphs of size N ( where, N = 1e9), each node has a degree D=1000. i.e There are overall (D*N)/2 edges in the graph. This graph needs to be generated randomly using the program. Now my task is to find the shortest distance from each node to every other node. And finally I want to find is the average distance from one node to another node in the graph. This is an average Erdos number or equivalently what degree of seperation exists in the graph. I can start with low values of N and D but my ultimate aim is to simulate this graph on big values of N and D. Every help is greatly appreciated. Thanks [EMAIL PROTECTED] wrote: [EMAIL PROTECTED]: I want to write a program which would have a 2 dimensional array of 1 billion by 1 billion. This is for computational purposes and evaluating a mathematical concept similar to Erdos number. Maybe you are talking about the edges of a graph with 1e9 nodes. This structure is surely quite sparse, so you don't need to store the edges in a matrix, you can manage is as a sparse structure, and maybe you don't need a Blue Gene. If you find ways to clean your data, reduce the vertex and arc count, and if you have a lot of memory, then maybe Boost Graph for Python may suffice: http://www.osl.iu.edu/~dgregor/bgl-python/ Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Fastest Way To Loop Through Every Pixel
Chaos wrote: As my first attempt to loop through every pixel of an image, I used for thisY in range(0, thisHeight): for thisX in range(0, thisWidth): #Actions here for Pixel thisX, thisY But it takes 450-1000 milliseconds I want speeds less than 10 milliseconds I have tried using SWIG, and pypy but they all are unsuccessfull in compiling my files. This probably won't work for you, but it's worth suggesting as it may give you other ideas to solve your problem. If it is a list of lists of pixel objects you can iterate though the pixels directly and not use range or xrange at all. For this to work the pixel object needs to be mutable or have an attribute to store it's value. It can't be just an int, in that case you will need to use indexes. pixel = [rgb_value] or pixel = [r,g,b] or class Pixel(object): def __self__(self, rgb_value): self.value = rgb_value pixel = Pixel(rgb_value) Or some other variation that is mutable. These may not be suitable and may cause additional overhead elsewhere as the image may need to be converted to some other form in order to display or save it. What Actions are you performing on the pixels? You may be able to increase the speed by creating lookup tables in dictionaries and then use the pixel value for the key. Just a rough example... action1 = dict() # fill dict with precomputed pixel key value pairs. # ... image = getimage() for row in image: for pixel in row: # one of the following or something similar pixel[0] = action1[pixel] pixel.value = action1[pixel.value] pixel[:] = action[pixel] The pixels need to be objects so they are mutable. If they aren't, then you will need to use index's as you did above. Precomputing the pixel value tables may use up too much memory or take a very long time if your image has a large amount of possible colors. If precomputing the pixels take too long but you are not concerned by the memory usage, you may be able to store (pickle) the precomputed tables then unpickle it before it is used. This work best if the number of colors (the depth) is limited. If these suggestions aren't applicable, then you most likely need to look at an image library that uses compiled C (or assembly) code to do the brute force work. It may also be possible to access your platforms directX or opengl library routines directly to do it. Cheers, Ron -- http://mail.python.org/mailman/listinfo/python-list
Re: simple dbus python problem ... please help
bob wrote:
snip
bus = dbus.Bus (dbus.Bus.TYPE_SYSTEM)
hal_service = bus.get_service ('org.freedesktop.Hal')
hal_manager = hal_service.get_object ('/org/freedesktop/Hal/Manager',
'org.freedesktop.Hal.Manager')
snip
It appears that bus.get_service() has been deprecated and deleted.
Not sure about the changes, so anyone else who can help please jump in.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Newbie..Needs Help
- Original Message -
From: Graham Feeley [EMAIL PROTECTED]
Newsgroups: comp.lang.python
To: python-list@python.org
Sent: Friday, July 28, 2006 5:11 PM
Subject: Re: Newbie..Needs Help
Thanks Nick for the reply
Of course my first post was a general posting to see if someone would be
able to help
here is the website which holds the data I require
http://www.aapracingandsports.com.au/racing/raceresultsonly.asp?storydate=27/07/2006meetings=bdgo
The fields required are as follows
NSW Tab
# Win Place
2$4.60 $2.40
5$2.70
1$1.30
Quin$23.00
Tri $120.70
Field names are
Date ( not important )
Track= Bendigo
RaceNoon web page
Res1st...2
Res2nd..5
Res3rd..1
Div1..$4.60
DivPlc...$2.40
Div2..$2.70
Div3..$1.30
DivQuin.$23.00
DivTrif...$120.70
As you can see there are a total of 6 meetings involved and I would need to
put in this parameter ( =bdgo) or (=gosf) these are the meeting tracks
Hope this more enlightening
Regards
graham
Graham,
Only a few days ago I gave someone a push who had a very similar problem. I
handed him code ready to run. I am doing it again for
you.
The site you use is much harder to interpret than the other one was and
so I took the opportunity to experimentally stretch
the envelope of a new brain child of mine: a stream editor called SE. It is new
and so I also take the opportunity to demo it.
One correspondent in the previous exchange was Paul McGuire, the author
of 'pyparse'. He made a good case for using 'pyparse'
in situations like yours. Unlike a stream editor, a parser reads structure in
addition to data and can relate the data to its
context.
Anlayzing the tables I noticed that they are poorly structured: The first
column contains both data and ids. Some records are
shorter than others, so column ids have to be guessed and hard coded. Missing
data sometimes is a dash, sometimes nothing. The
inconsistencies seem to be consistent, though, down the eight tables of the
page. So they can be formalized with some confidence
that they are systematic. If Paul could spend some time on this, I'd be much
interested to see how he would handle the relative
disorder.
Another thought: The time one invests in developing a program should not
exceed the time it can save overall (not talking
about recreational programming). Web pages justify an extra measure of caution,
because they may change any time and when they do
they impose an unscheduled priority every time the reader stops working and
requires a revision.
So, here is your program. I write it so you can copy the whole thing to a file.
Next copy SE from the Cheese Shop. Unzip it and put
both SE.PY and SEL.PY where your Python progams are. Then 'execfile' the code
in an IDLE window, call 'display_horse_race_data
('Bendigo', '27/07/2006') and see what happens. You'll have to wait ten seconds
or so.
Regards
Frederic
##
TRACKS = { 'New Zealand' : '',
'Bendigo' : 'bdgo',
'Gosford' : 'gosf',
'Northam' : 'nthm',
'Port Augusta': 'pta',
'Townsville' : 'town',
}
# This function does it all once all functions are loaded. If nothing shows, the
# page has not data.
def display_horse_race_data (track, date, clip_summary = 100):
tracks: e.g. 'Bendigo' or 'bdgo'
date: e.g. '27/07/2006'
clip_summary: each table has a long summary header.
the argument says hjow much of it to show.
if track [0].isupper ():
if TRACKS.has_key (track):
track = TRACKS [track]
else:
print 'No such track %s' % track
return
open ()
header, records = get_horse_race_data (track, date)
show_records (header, records, clip_summary)
##
import SE, urllib
_is_open = 0
def open ():
global _is_open
if not _is_open: # Skip repeat calls
global Data_Filter, Null_Data_Marker, Tag_Stripper, Space_Deflator,
CSV_Maker
# Making the following Editors is a step-by-step process, adding one
element at a time and
# looking at what it does and what should be done next.
# Get pertinent data segments
header= ' ~(?i)Today\'s Results - .+?div
style=padding-top:5px;~==*END*OF*HEADER* '
race_summary = ' ~(?i)Race [1-9].*?/fontbr~== '
data_segment = ' ~(?i)table border=0 width=100% cellpadding=0
cellspacing=0(.|\n)*?/table~==*END*OF*SEGMENT* '
Data_Filter = SE.SE (' EAT ' + header + race_summary + data_segment)
# Some data items are empty. Fill them with a dash.
mark_null_data = '
Pygame Help
Hi, I am trying to make a game using either livewires or pygame. The game is tetris. Right now I have gotten the program to a point where everything works (as in user input, score, lines, etc), except I can't get more than one block to work. Right now I have the user playing a game where a single block falls at a time instead of one of the seven different patterns. I was curious how you would program the seperate images to fall together and not break apart, because pygame and livewires uses images as collision detection, so therefore you can't make most of the shapes a single image because they will have transparent spaces as part of the image, which will make floating shapes and such. --Thanks --Andrew -- http://mail.python.org/mailman/listinfo/python-list
Re: Pygame Help
In [EMAIL PROTECTED], Blaze Bresko wrote: [Tetris] I was curious how you would program the seperate images to fall together and not break apart, because pygame and livewires uses images as collision detection, so therefore you can't make most of the shapes a single image because they will have transparent spaces as part of the image, which will make floating shapes and such. I wouldn't rely on the graphics library at all but create a model of the game that's completely independent from the graphics. I think a two dimensional structure with lists of lists is the simplest solution. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Pygame Help
I was curious how you would program the seperate images to fall together and not break apart, because pygame and livewires uses images as collision detection, so therefore you can't make most of the shapes a single image because they will have transparent spaces as part of the image, which will make floating shapes and such. The way I did it was to compose the shapes out of squares. The implementation is available in the pygsear-games distribution. You'd need pygsear also, to play the game. http://www.nongnu.org/pygsear/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Math package
[EMAIL PROTECTED] wrote: I will write the problem a little more clearer so that you guys can recommend me better. In a graphs of size N ( where, N = 1e9), each node has a degree D=1000. i.e There are overall (D*N)/2 edges in the graph. This graph needs to be generated randomly using the program. You will need to specify your desired random generation algorithm a bit better. There are lots of ways to do that, and different choices will affect your results substantially. They will also affect your *ability* to get results. Now my task is to find the shortest distance from each node to every other node. And finally I want to find is the average distance from one node to another node in the graph. This is an average Erdos number or equivalently what degree of seperation exists in the graph. I can start with low values of N and D but my ultimate aim is to simulate this graph on big values of N and D. You probably won't be able to get up to N=1e9 and D=1000. The memory requirements are just too large even with a better data structure than an adjacency matrix (possibly the worst one you could use for problems this size). However, for smaller graphs, you will probably want to look at the Boost Graph Library, as someone else has already mentioned, and LANL's NetworkX package. It was written for the statistical study of large networks (though not as large as you want). https://networkx.lanl.gov/ If you have a large cluster available, you might be able to parallelize your algorithms using the Parallel Boost Graph Library. I don't believe that Python bindings are available though. Your ability to solve your problem will also depend on the structure of the graph that you generated. Some networks parallelize better than others. Look at the Performance link on the site below. http://osl.iu.edu/research/pbgl/ -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Comma is not always OK in the argument list?!
Dennis,
You make a good point, that is what I though first. Semantically I
thought a comma after **kw as in ..., **kw,) doesn't make sense because
there is nothing that could follow **kw except the ')'. But then trying
some other cases (see the previous posts for my examples) I noticed
that commas aren't allowed after *pos_args also. For example if ,
*pos_args,) would be an error BUT stuff could follow *pos_args and that
could be **kw as in ..., *pos_args,**kw).
In other words the behavior is not consistent. So it seems that 3
things could happen with this:
1) Not allow commas after **kw only. Allow them in any other case,
because semantically 'stuff' could possibly follow.
2) Don't allow extra commas for all the argument lists. In other words
f(1,2,) or f(a=1,b=2,) would be an error. But then do we want argument
lists to be consistent with tuples as far as syntax goes?
3) Allow trailing commas after all kinds of arguments in the argument
lists. This is what the documentation describes at the moment. I think
this is more sensible. I understand that argument lists and tuples are
not the same, but it would be nice to have a _syntactic_ consistency,
as opposed to 'a surprise'. As in t=(1,2,3,) f(1,2,3,) f(1,*[2,3],)
and f(1,*[2],**{'c':3},) should all be 'OK'.
Perhaps more Python core developers would comment...
Nick Vatamaniuc
Dennis Lee Bieber wrote:
On 29 Jul 2006 07:26:57 -0700, Nick Vatamaniuc [EMAIL PROTECTED]
declaimed the following in comp.lang.python:
Roman,
The way I see it, it could be either way. In other words if I can
write f(1,2,3) and f(1,2,3,) I should also be able to write
f(1,*[2,3],). It is a really small detail but there sould be some
consistency. Either no extra commas for all kinds of argument types or
Part of the problem may be that the * notation implies that the
associated argument is supposed to fill ALL other supplied positional
arguments -- so what is that empty argument after the , supposed to be
associated with? A positional argument /after/ all positional arguments?
--
WulfraedDennis Lee Bieber KD6MOG
[EMAIL PROTECTED] [EMAIL PROTECTED]
HTTP://wlfraed.home.netcom.com/
(Bestiaria Support Staff: [EMAIL PROTECTED])
HTTP://www.bestiaria.com/
--
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Re: War chest for writing web apps in Python?
Stani, Thanks. I'll definetly give SPE another try. You have a great editor with features that others don't have. I'll try it with the latest wxPython. I never really thought SPE was the problem, it seemed like a lot of issues I saw were from wxWidgets... Nick V. SPE - Stani's Python Editor wrote: Nick Vatamaniuc schreef: I found Komodo to be too slow on my machine, SPE was also slow, was crashing on me and had strange gui issues, I hope you didn't install SPE from the MOTU repositories with synaptic or apt-get. I use SPE myself daily on Ubuntu and wrote this howto install SPE on Ubuntu: http://www.ubuntuforums.org/showthread.php?t=218001highlight=wxpython I know that others are running SPE on Ubuntu without problems. The main point is not to use SPE from the repositories, but from the SPE website. If the howto is too much just download the -nosetup.zip Stani -- http://pythonide.stani.be -- http://mail.python.org/mailman/listinfo/python-list
Re: Fastest Way To Loop Through Every Pixel
Paul McGuire [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Chaos [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] myCol = (0.3 * image.GetRed(thisX, thisY)) + (0.59 * image.GetGreen(thisX, thisY)) + (0.11 * image.GetBlue(thisX, thisY)) if myCol darkestCol: darkestCol = myCol possX = thisX possY = thisY Psyco may be of some help to you, especially if you extract out your myCol expression into its own function, something like: def darkness(img,x,y): return (0.3 * img.GetRed(x,y)) + (0.59 * img.GetGreen(x,y)) + (0.11 * img.GetBlue(x,y)) snip Even better than my other suggestions might be to write this function, and then wrap it in a memoizing decorator (http://wiki.python.org/moin/PythonDecoratorLibrary#head-11870a08b0fa59a8622 201abfac735ea47ffade5) - surely there must be some repeated colors in your image. -- Paul -- http://mail.python.org/mailman/listinfo/python-list
making pseudo random number with spam ad convert text to binary
here is a little project to make a more or less good pseudo random generator by using spam :http://euryale.googlecode.com/it's almost quite finished but i've got a last problem i didn't manage to convert text to binary : hazard = binascii.a2b_qp(attachment) + binascii.a2b_qp(body) + binascii.a2b_qp(addr) + binascii.a2b_qp(sujet) print binascii.b2a_qp(hazard)it still print me ascii charactersregardsBussiere -- http://mail.python.org/mailman/listinfo/python-list
python and JMS
I am looking to use python to talk to JMS. Can some please point me to such resources if this is possible. Sri -- http://mail.python.org/mailman/listinfo/python-list
Re: Proposal for new option -U extending -u
James Thiele wrote: Currently -u specifies that stdin, stdout and stderr are all unbuffered. I propose a that -U make all files unbuffered. It could be useful for programs that log to files. Comments solicited. Unnecessary. You can control the buffering of any file object you create yourself, e.g. open(somefile,buffering=0) to create an unbuffered file object. The reason you need a switch for stdin, stdout, stderr is you don't create those objects yourself. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie..Needs Help
Well Well Well, Anthra you are a clever person, Are
nt you
I nearly fell over when i read your post.
Would it help if we used another web site to gather data
As you stated the tables are not all that well structured.
well I will give thisone a go first and if there is anything I can do for
you just ask and I will try my best.
I really appreciate what you have done.
Of course I will try to follow your code to see if any will fall on
meLOL
Regards
Graham
Anthra Norell [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
- Original Message -
From: Graham Feeley [EMAIL PROTECTED]
Newsgroups: comp.lang.python
To: python-list@python.org
Sent: Friday, July 28, 2006 5:11 PM
Subject: Re: Newbie..Needs Help
Thanks Nick for the reply
Of course my first post was a general posting to see if someone would be
able to help
here is the website which holds the data I require
http://www.aapracingandsports.com.au/racing/raceresultsonly.asp?storydate=27/07/2006meetings=bdgo
The fields required are as follows
NSW Tab
# Win Place
2$4.60 $2.40
5$2.70
1$1.30
Quin$23.00
Tri $120.70
Field names are
Date ( not important )
Track= Bendigo
RaceNoon web page
Res1st...2
Res2nd..5
Res3rd..1
Div1..$4.60
DivPlc...$2.40
Div2..$2.70
Div3..$1.30
DivQuin.$23.00
DivTrif...$120.70
As you can see there are a total of 6 meetings involved and I would need
to
put in this parameter ( =bdgo) or (=gosf) these are the meeting tracks
Hope this more enlightening
Regards
graham
Graham,
Only a few days ago I gave someone a push who had a very similar problem.
I handed him code ready to run. I am doing it again for
you.
The site you use is much harder to interpret than the other one was
and so I took the opportunity to experimentally stretch
the envelope of a new brain child of mine: a stream editor called SE. It
is new and so I also take the opportunity to demo it.
One correspondent in the previous exchange was Paul McGuire, the
author of 'pyparse'. He made a good case for using 'pyparse'
in situations like yours. Unlike a stream editor, a parser reads structure
in addition to data and can relate the data to its
context.
Anlayzing the tables I noticed that they are poorly structured: The
first column contains both data and ids. Some records are
shorter than others, so column ids have to be guessed and hard coded.
Missing data sometimes is a dash, sometimes nothing. The
inconsistencies seem to be consistent, though, down the eight tables of
the page. So they can be formalized with some confidence
that they are systematic. If Paul could spend some time on this, I'd be
much interested to see how he would handle the relative
disorder.
Another thought: The time one invests in developing a program should
not exceed the time it can save overall (not talking
about recreational programming). Web pages justify an extra measure of
caution, because they may change any time and when they do
they impose an unscheduled priority every time the reader stops working
and requires a revision.
So, here is your program. I write it so you can copy the whole thing to a
file. Next copy SE from the Cheese Shop. Unzip it and put
both SE.PY and SEL.PY where your Python progams are. Then 'execfile' the
code in an IDLE window, call 'display_horse_race_data
('Bendigo', '27/07/2006') and see what happens. You'll have to wait ten
seconds or so.
Regards
Frederic
##
TRACKS = { 'New Zealand' : '',
'Bendigo' : 'bdgo',
'Gosford' : 'gosf',
'Northam' : 'nthm',
'Port Augusta': 'pta',
'Townsville' : 'town',
}
# This function does it all once all functions are loaded. If nothing
shows, the
# page has not data.
def display_horse_race_data (track, date, clip_summary = 100):
tracks: e.g. 'Bendigo' or 'bdgo'
date: e.g. '27/07/2006'
clip_summary: each table has a long summary header.
the argument says hjow much of it to show.
if track [0].isupper ():
if TRACKS.has_key (track):
track = TRACKS [track]
else:
print 'No such track %s' % track
return
open ()
header, records = get_horse_race_data (track, date)
show_records (header, records, clip_summary)
##
import SE, urllib
_is_open = 0
def open ():
global _is_open
if not _is_open: # Skip repeat calls
global Data_Filter, Null_Data_Marker, Tag_Stripper, Space_Deflator,
CSV_Maker
# Making the following Editors is a step-by-step process,
PIL on MacOS
I was trying to build PIL and pygame from the source on the MacOS. But when I typed 'sudo python setup.py install', it gives error msg : gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -fno-strict-aliasing -Wno-long-double -no-cpp-precomp -mno-fused-madd -fno-common -dynamic -DNDEBUG -g -DHAVE_LIBZ -DWORDS_BIGENDIAN -I/System/Library/Frameworks/Tcl.framework/Headers -I/System/Library/Frameworks/Tk.framework/Headers -I/usr/local/include/freetype2 -IlibImaging -I/Library/Frameworks/Python.framework/Versions/2.4/include -I/usr/local/include -I/usr/include -I/Library/Frameworks/Python.framework/Versions/2.4/include/python2.4 -c _imaging.c -o build/temp.macosx-10.4-fat-2.4/_imaging.o gcc: cannot specify -o with -c or -S and multiple compilations error: command 'gcc' failed with exit status 1 Is there any one who did this before?how can i solve it? Thanks -- http://mail.python.org/mailman/listinfo/python-list
[ python-Bugs-1112549 ] cgi.FieldStorage memory usage can spike in line-oriented ops
Bugs item #1112549, was opened at 2005-01-30 13:40 Message generated for change (Settings changed) made by gbrandl You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1112549group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Library Group: Python 2.3 Status: Open Resolution: None Priority: 8 Submitted By: Chris McDonough (chrism) Assigned to: Nobody/Anonymous (nobody) Summary: cgi.FieldStorage memory usage can spike in line-oriented ops Initial Comment: Various parts of cgi.FieldStorage call its read_lines_to_outerboundary, read_lines and skip_lines methods.These methods use the readline method of the file object that represents an input stream. The input stream is typically data supplied by an untrusted source (such as a user uploading a file from a web browser). The input data is not required by the RFC 822/1521/1522/1867 specifications to contain any newline characters. For example, it is within the bounds of the specification to supply a a multipart/form-data input stream with a file-data part that consists of a 2GB string composed entirely of x characters (which happens to be something I did that led me to noticing this bug). The simplest fix is to make use of the size argument of the readline method of the file object where it is used within all parts of FieldStorage that make use of it. A patch against the Python 2.3.4 cgi.py module that does this is attached. -- Comment By: Chris McDonough (chrism) Date: 2006-07-27 21:42 Message: Logged In: YES user_id=32974 The files I've just uploaded are revisions to the cgi and test_cgi modules for the current state of the SVN trunk. If someone could apply these, it would be appreciated, or give me access and I'll be happy to. FTR, this is a bug which exposes systems which use the cgi.FieldStorage class (most Python web frameworks do) to a denial of service potential. -- Comment By: Chris McDonough (chrism) Date: 2005-04-03 04:00 Message: Logged In: YES user_id=32974 FYI, I'd be happy to do the merging here if you wanted to give me checkin access. -- Comment By: Chris McDonough (chrism) Date: 2005-04-03 03:42 Message: Logged In: YES user_id=32974 An updated test_cgi.py is attached. I test both the readline behavior and add a test for basic multipart parsing. -- Comment By: Guido van Rossum (gvanrossum) Date: 2005-04-01 04:48 Message: Logged In: YES user_id=6380 Can I tweak you into uploading a unit test? -- Comment By: Chris McDonough (chrism) Date: 2005-04-01 02:56 Message: Logged In: YES user_id=32974 Re: parse_multipart.. yes, it looks like there's no use fixing that as it just turns around and puts the line into a list.. it is vulnerable but just by virtue of its non-use of a tempfile, it appears doomed anyway for large requests. I don't know of anything that uses it. Good catch wrt boundary recognition bug, I'm uploading another patch. -- Comment By: Guido van Rossum (gvanrossum) Date: 2005-03-31 22:13 Message: Logged In: YES user_id=6380 Methinks that the fix isn't quite right: it would incorrectly recognize as a boundary a very long line starting with -- followed by the appropriate random string at offset 2**16. This could probably be taken care of by adding a flag that is true initially and after that keeps track of whether the previous line ended in \n. Also, there's a call to fp.readline() in parse_multipart() that you didn't patch -- it wouldn't help because that code is saving the lines in a list anyway, but isn't that code vulnerable as well? Or is it not used? -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1112549group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1441397 ] compiler module loses docstrings
Bugs item #1441397, was opened at 2006-03-02 00:52
Message generated for change (Comment added) made by gbrandl
You can respond by visiting:
https://sourceforge.net/tracker/?func=detailatid=105470aid=1441397group_id=5470
Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: Parser/Compiler
Group: None
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: Michael Hudson (mwh)
Assigned to: Nobody/Anonymous (nobody)
Summary: compiler module loses docstrings
Initial Comment:
this is svn head:
import compiler
compiler.transformer.parse('doc')
Module(None, Stmt([Discard(Const('doc'))]))
this is 2.4:
import compiler
compiler.transformer.parse('doc')
Module('doc', Stmt([]))
I think the problem may be rooted in the parser module rather than the
compiler module itself.
--
Comment By: Georg Brandl (gbrandl)
Date: 2006-07-29 09:34
Message:
Logged In: YES
user_id=849994
The bug was transformer._doc_nodes missing or_test.
Fixed in rev. 50924, including test.
--
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[ python-Bugs-1014230 ] optparse: parser.remove_option(-h) inconsistency
Bugs item #1014230, was opened at 2004-08-23 10:04 Message generated for change (Settings changed) made by gbrandl You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1014230group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Library Group: None Status: Open Resolution: None Priority: 5 Submitted By: strop (strop) Assigned to: Greg Ward (gward) Summary: optparse: parser.remove_option(-h) inconsistency Initial Comment: remove_option(-h) method of OptionParser has a strange behaviour : it can't be removed from 2 different OptionParser objects. It may be due to the fact that the help option seems to be a unique object. Even if this can be solved by addind add_help_option=0 to OptionParser constructor parameters, it seems to be an inconsistency wrt remove_option method -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1014230group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1519571 ] turtle.py Docs still incomplete
Bugs item #1519571, was opened at 2006-07-09 10:49 Message generated for change (Settings changed) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1519571group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.5 Status: Open Resolution: None Priority: 5 Submitted By: Lingl (gregorlingl) Assigned to: A.M. Kuchling (akuchling) Summary: turtle.py Docs still incomplete Initial Comment: There are three functions in turtle.py (which do not occur as methods of Pen), which are still not documented: setup() title() done() Regards, Gregor -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1519571group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1519571 ] turtle.py Docs still incomplete
Bugs item #1519571, was opened at 2006-07-09 10:49 Message generated for change (Comment added) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1519571group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.5 Status: Closed Resolution: Fixed Priority: 5 Submitted By: Lingl (gregorlingl) Assigned to: A.M. Kuchling (akuchling) Summary: turtle.py Docs still incomplete Initial Comment: There are three functions in turtle.py (which do not occur as methods of Pen), which are still not documented: setup() title() done() Regards, Gregor -- Comment By: A.M. Kuchling (akuchling) Date: 2006-07-29 10:46 Message: Logged In: YES user_id=11375 I've added documentation for these methods in rev. 50932. Thanks for pointing out the omission! -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1519571group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1414697 ] inconsistency in help(set)
Bugs item #1414697, was opened at 2006-01-25 10:43 Message generated for change (Comment added) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1414697group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.4 Status: Closed Resolution: Fixed Priority: 5 Submitted By: Gregory Petrosyan (gregory_p) Assigned to: Raymond Hettinger (rhettinger) Summary: inconsistency in help(set) Initial Comment: help(set) Help on class set in module __builtin__: class set(object) | set(iterable) -- set object | | Build an unordered collection. | | Methods defined here: | ... It would be better for docstring to be Build an unordered collection with no duplicate elements. instead of Build an unordered collection. -- Comment By: A.M. Kuchling (akuchling) Date: 2006-07-29 11:12 Message: Logged In: YES user_id=11375 Thanks for your suggestion; I've added 'unordered collection of unique elements' in rev. 50934. -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1414697group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1530382 ] ssl object documentation lacks a couple of methods
Bugs item #1530382, was opened at 2006-07-28 09:20 Message generated for change (Comment added) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1530382group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.5 Status: Closed Resolution: Fixed Priority: 5 Submitted By: Lawrence Oluyede (rhymes) Assigned to: A.M. Kuchling (akuchling) Summary: ssl object documentation lacks a couple of methods Initial Comment: According to http://docs.python.org/dev/lib/ssl-objects.html the SSL Objects expose only write() and read() but they also expose issuer() and server() methods. See Modueles/_ssl.c from line 557 to 565 -- Comment By: A.M. Kuchling (akuchling) Date: 2006-07-29 11:35 Message: Logged In: YES user_id=11375 I've documented these methods in rev. 50935. Thanks for pointing out this omission! -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1530382group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1465014 ] CSV regression in 2.5a1: multi-line cells
Bugs item #1465014, was opened at 2006-04-05 11:14 Message generated for change (Comment added) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1465014group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.5 Status: Open Resolution: Rejected Priority: 5 Submitted By: David Goodger (goodger) Assigned to: Skip Montanaro (montanaro) Summary: CSV regression in 2.5a1: multi-line cells Initial Comment: Running the attached csv_test.py under Python 2.4.2 (Windows XP SP1) produces: c:\apps\python24\python.exe ./csv_test.py ['one', '2', 'three (line 1)\n(line 2)'] Note that the third item in the row contains a newline between (line 1) and (line 2). With Python 2.5a1, I get: c:\apps\python25\python.exe ./csv_test.py ['one', '2', 'three (line 1)(line 2)'] Notice the missing newline, which is significant. The CSV module under 2.5a1 seems to lose data. -- Comment By: A.M. Kuchling (akuchling) Date: 2006-07-29 13:24 Message: Logged In: YES user_id=11375 I looked at this bug report, but I have no idea of exactly what behaviour has changed or what needs to be described. -- Comment By: Andrew McNamara (andrewmcnamara) Date: 2006-06-22 23:34 Message: Logged In: YES user_id=698599 Yep, your point about adding a comment to the documentation is fair. Skip, do you want to take my words and massage them into a form suitable for the docs? -- Comment By: David Goodger (goodger) Date: 2006-06-22 23:13 Message: Logged In: YES user_id=7733 I didn't realize that the previous behavior was buggy; I thought that the current behavior was a side-effect. The 2.5 behavior did cause a small problem in Docutils, but it's already been fixed. I just wanted to ensure that no regression was creeping in to 2.5. Thanks for the explanation! Perhaps it could be added to the docs in some form? Marking the bug report closed. -- Comment By: Andrew McNamara (andrewmcnamara) Date: 2006-06-22 20:27 Message: Logged In: YES user_id=698599 The previous behaviour caused considerable problems, particularly on platforms that did not use the unix line- ending conventions, or with files that originated on those platforms - users were finding mysterious newlines where they didn't expect them. Quoted fields exist to allow characters that would otherwise be considered part of the syntax to appear within the field. So yes, quoted fields are a special case, and necessarily so. The current behaviour puts the control back in the hands of the user of the module: if literal newlines are important within a field, they need to read their file in a way that preserves the newlines. The old behaviour would introduce spurious characters into quoted fields, with no way for the user to control that behaviour. I'm sorry that the change causes you problems. With a format that's as loosely defined as CSV, it's an unfortunate fact of life that there are going to be conflicting requirements. -- Comment By: David Goodger (goodger) Date: 2006-06-22 14:17 Message: Logged In: YES user_id=7733 I see what you're saying, but I disagree. In Python 2.4, csv.reader did not require newlines, but in Python 2.5 it does. That's a significant behavioral change. In the stdlib csv Module Contents docs for csv.reader, it says: csvfile can be any object which supports the iterator protocol and returns a string each time its next method is called. It doesn't mention newline-terminated strings. In any case, the behavior is inconsistent: newlines are not required to terminate row-ending strings, but only strings which end inside cells split across rows. Why the discrepancy? -- Comment By: Andrew McNamara (andrewmcnamara) Date: 2006-06-20 19:17 Message: Logged In: YES user_id=698599 I think your problem is with str.splitlines(), rather than the csv.reader: splitlines ate the newline. If you pass it True as an argument, it will retain the end-of-line character in the resulting strings. -- Comment By: David Goodger (goodger) Date: 2006-05-02 17:04 Message: Logged In: YES user_id=7733 Assigned to Andrew McNamara, since his change appears to have caused this regression (revision 38290 on Modules/_csv.c). -- Comment By: David Goodger (goodger) Date: 2006-05-02 16:58 Message: Logged
[ python-Bugs-1429053 ] set documentation deficiencies
Bugs item #1429053, was opened at 2006-02-10 07:07 Message generated for change (Comment added) made by akuchling You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1429053group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.4 Status: Closed Resolution: Fixed Priority: 5 Submitted By: Keith Briggs (kbriggs) Assigned to: A.M. Kuchling (akuchling) Summary: set documentation deficiencies Initial Comment: http://www.python.org/doc/current/lib/types-set.html has a dead link: Module sets. Also, there does not seem to be any documentation on how to construct a set. Does set()==set([])? What is allowed as an argument to set()? Any iterable? -- Comment By: A.M. Kuchling (akuchling) Date: 2006-07-29 13:27 Message: Logged In: YES user_id=11375 This bug seems to be fixed; closing. -- Comment By: Georg Brandl (birkenfeld) Date: 2006-02-13 14:29 Message: Logged In: YES user_id=1188172 The new location of the devel docs is http://docs.python.org/dev. -- Comment By: Keith Briggs (kbriggs) Date: 2006-02-13 07:12 Message: Logged In: YES user_id=888261 Where is it fixed? I see all the same problems at http://www.python.org/dev/doc/devel/lib/types-set.html. -- Comment By: Georg Brandl (birkenfeld) Date: 2006-02-10 11:21 Message: Logged In: YES user_id=1188172 This is all already corrected, except for the empty set thing. -- Comment By: Keith Briggs (kbriggs) Date: 2006-02-10 10:53 Message: Logged In: YES user_id=888261 Furthermore, the operations update etc. are mutations of s, so wouldn't the definitions s.update(t) s |= t return set s with elements added from t s.intersection_update(t)s = t return set s keeping only elements also found in t s.difference_update(t) s -= t return set s after removing elements found in t s.symmetric_difference_update(t)s ^= t return set s with elements from s or t but not both be better as s.update(t) s |= t add elements from t to s etc.? I'm not sure what the word return is doing here. -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1429053group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1530959 ] distutils doesn't notice --with-pydebug
Bugs item #1530959, was opened at 2006-07-29 13:45 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1530959group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Library Group: Python 2.5 Status: Open Resolution: None Priority: 5 Submitted By: Collin Winter (collinwinter) Assigned to: Nobody/Anonymous (nobody) Summary: distutils doesn't notice --with-pydebug Initial Comment: As it stands (as of r50921), building a C extension module first with a debug build of Python (built with --with-pydebug), then with a regular Python build (without --with-pydebug) does not cause distutils to recompile the extension module as it should. This leads to undefined symbol errors at runtime when the module is loaded. The attached patch against Lib/distutils/command/build.py causes distutils.command.build to append '-pydebug' to the platform-specific directory name (e.g., 'linux-i686-2.5') if Python was compiled with --with-pydebug. -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1530959group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1465014 ] CSV regression in 2.5a1: multi-line cells
Bugs item #1465014, was opened at 2006-04-05 10:14 Message generated for change (Comment added) made by montanaro You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1465014group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.5 Status: Pending Resolution: Fixed Priority: 5 Submitted By: David Goodger (goodger) Assigned to: Skip Montanaro (montanaro) Summary: CSV regression in 2.5a1: multi-line cells Initial Comment: Running the attached csv_test.py under Python 2.4.2 (Windows XP SP1) produces: c:\apps\python24\python.exe ./csv_test.py ['one', '2', 'three (line 1)\n(line 2)'] Note that the third item in the row contains a newline between (line 1) and (line 2). With Python 2.5a1, I get: c:\apps\python25\python.exe ./csv_test.py ['one', '2', 'three (line 1)(line 2)'] Notice the missing newline, which is significant. The CSV module under 2.5a1 seems to lose data. -- Comment By: Skip Montanaro (montanaro) Date: 2006-07-29 15:07 Message: Logged In: YES user_id=44345 I checked in a change to libcsv.tex (revision 50953). It adds a versionchanged bit to the reader doc that explains why the behavior changed in 2.5. Andrew Andrew, please check my work. Sorry for the delay taking care of this. Skip -- Comment By: A.M. Kuchling (akuchling) Date: 2006-07-29 12:24 Message: Logged In: YES user_id=11375 I looked at this bug report, but I have no idea of exactly what behaviour has changed or what needs to be described. -- Comment By: Andrew McNamara (andrewmcnamara) Date: 2006-06-22 22:34 Message: Logged In: YES user_id=698599 Yep, your point about adding a comment to the documentation is fair. Skip, do you want to take my words and massage them into a form suitable for the docs? -- Comment By: David Goodger (goodger) Date: 2006-06-22 22:13 Message: Logged In: YES user_id=7733 I didn't realize that the previous behavior was buggy; I thought that the current behavior was a side-effect. The 2.5 behavior did cause a small problem in Docutils, but it's already been fixed. I just wanted to ensure that no regression was creeping in to 2.5. Thanks for the explanation! Perhaps it could be added to the docs in some form? Marking the bug report closed. -- Comment By: Andrew McNamara (andrewmcnamara) Date: 2006-06-22 19:27 Message: Logged In: YES user_id=698599 The previous behaviour caused considerable problems, particularly on platforms that did not use the unix line- ending conventions, or with files that originated on those platforms - users were finding mysterious newlines where they didn't expect them. Quoted fields exist to allow characters that would otherwise be considered part of the syntax to appear within the field. So yes, quoted fields are a special case, and necessarily so. The current behaviour puts the control back in the hands of the user of the module: if literal newlines are important within a field, they need to read their file in a way that preserves the newlines. The old behaviour would introduce spurious characters into quoted fields, with no way for the user to control that behaviour. I'm sorry that the change causes you problems. With a format that's as loosely defined as CSV, it's an unfortunate fact of life that there are going to be conflicting requirements. -- Comment By: David Goodger (goodger) Date: 2006-06-22 13:17 Message: Logged In: YES user_id=7733 I see what you're saying, but I disagree. In Python 2.4, csv.reader did not require newlines, but in Python 2.5 it does. That's a significant behavioral change. In the stdlib csv Module Contents docs for csv.reader, it says: csvfile can be any object which supports the iterator protocol and returns a string each time its next method is called. It doesn't mention newline-terminated strings. In any case, the behavior is inconsistent: newlines are not required to terminate row-ending strings, but only strings which end inside cells split across rows. Why the discrepancy? -- Comment By: Andrew McNamara (andrewmcnamara) Date: 2006-06-20 18:17 Message: Logged In: YES user_id=698599 I think your problem is with str.splitlines(), rather than the csv.reader: splitlines ate the newline. If you pass it True as an argument, it will retain the end-of-line character in the resulting strings.
[ python-Bugs-960860 ] botched html for index subheadings
Bugs item #960860, was opened at 2004-05-26 10:17 Message generated for change (Comment added) made by fdrake You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=960860group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: None Status: Open Resolution: None Priority: 5 Submitted By: Jim Jewett (jimjjewett) Assigned to: Fred L. Drake, Jr. (fdrake) Summary: botched html for index subheadings Initial Comment: In the index, if a topic has subtopics, it should be listed as dttopic dddldtsubtopic1 dtsubtopic2 /dl In some cases (such as the reference manual entries for module, or object(continued)), it is correct. In other cases (such as the entries for name, or the first column of object), the dddl.../dl wrapper is left out, so that the subentries appear to be normal entries that just happen to be out of alphabetical order. -- Comment By: Fred L. Drake, Jr. (fdrake) Date: 2006-07-29 16:15 Message: Logged In: YES user_id=3066 This appears to be fine in the 2.4.3 and development versions of the documentation. If I'm missing something, please be specific about what you think is wrong. -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=960860group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1531016 ] Comman not allowed at the end of argument list for **argumen
Bugs item #1531016, was opened at 2006-07-29 20:21
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Category: Parser/Compiler
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Roman Suzi (rnd0110)
Assigned to: Nobody/Anonymous (nobody)
Summary: Comman not allowed at the end of argument list for **argumen
Initial Comment:
This tells it all:
str('sdfd', **a,)
File stdin, line 1
str('sdfd', **a,)
^
SyntaxError: invalid syntax
str('sdfd', *a,)
File stdin, line 1
str('sdfd', *a,)
^
SyntaxError: invalid syntax
While the docs tell otherwise:
http://docs.python.org/ref/calls.html
While having arguments after ** doesn't make sense,
comma after ANY kinds of arguments seem to be more
consistent.
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[ python-Bugs-1531016 ] Comma not allowed at the end of argument list for **argument
Bugs item #1531016, was opened at 2006-07-29 20:21
Message generated for change (Settings changed) made by rnd0110
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Category: Parser/Compiler
Group: Python 2.4
Status: Open
Resolution: None
Priority: 2
Submitted By: Roman Suzi (rnd0110)
Assigned to: Nobody/Anonymous (nobody)
Summary: Comma not allowed at the end of argument list for **argument
Initial Comment:
This tells it all:
str('sdfd', **a,)
File stdin, line 1
str('sdfd', **a,)
^
SyntaxError: invalid syntax
str('sdfd', *a,)
File stdin, line 1
str('sdfd', *a,)
^
SyntaxError: invalid syntax
While the docs tell otherwise:
http://docs.python.org/ref/calls.html
While having arguments after ** doesn't make sense,
comma after ANY kinds of arguments seem to be more
consistent.
--
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[ python-Bugs-1163367 ] correct/clarify documentation for super
Bugs item #1163367, was opened at 2005-03-14 18:39
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Category: Documentation
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Steven Bethard (bediviere)
Assigned to: Fred L. Drake, Jr. (fdrake)
Summary: correct/clarify documentation for super
Initial Comment:
The current documentation for super is confusing. For
instance, it says that it returns the superclass of
type which is incorrect; it actually returns the next
type in type's MRO. Well, to be truthful, it doesn't
even do that; it returns a proxy object which makes
that type's attributes available, but that's just
another reason to fix the documentation.
I suggest changing the wording to something like:
super(type[, object-or-type])
Return an object that exposes the attributes available
through the type's superclasses, without exposing the
attributes of the type itself. Attributes will be
looked up using the normal resolution order, omitting
the first class in the MRO (that is, the type itself).
If the second argument is present, it should either be
an instance of object, in which case
isinstance(object-or-type, type) must be true, or it
should be an instance of type, in which case
issubclass(object-or-type, type) must be true. The
typical use for this form of super is to call a
cooperative superclass method:
class C(B):
def meth(self, arg):
super(C, self).meth(arg)
If the second argument to super is omitted, the super
object returned will not expose any attributes
directly. However, attributes will be accessible
whenever the descriptor machinery is invoked, e.g.
though explicit invocation of __get__.
Note that super is undefined for implicit lookups using
statements or operators such as super(C, self)[name].
These must be spelled out with their explicit lookup,
e.g. super(C, self).__getitem__(name). New in version
2.2.
It's not perfect and I welcome suggestions for
re-wording, but I think it's substantially more
accurate about what super actually does. It also moves
the second argument omitted situation to the end,
since this is a vastly more uncommon use case.
--
Comment By: Fred L. Drake, Jr. (fdrake)
Date: 2006-07-29 16:40
Message:
Logged In: YES
user_id=3066
I'm not sure what the paragraph following the \end{verbatim}
means. Can someone clarify?
--
Comment By: Georg Brandl (birkenfeld)
Date: 2006-01-20 12:06
Message:
Logged In: YES
user_id=1188172
See also Bug #973579 (which I closed as duplicate) for
alternative wording.
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[ python-Bugs-960860 ] botched html for index subheadings
Bugs item #960860, was opened at 2004-05-26 14:17 Message generated for change (Settings changed) made by gbrandl You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=960860group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: None Status: Pending Resolution: None Priority: 5 Submitted By: Jim Jewett (jimjjewett) Assigned to: Fred L. Drake, Jr. (fdrake) Summary: botched html for index subheadings Initial Comment: In the index, if a topic has subtopics, it should be listed as dttopic dddldtsubtopic1 dtsubtopic2 /dl In some cases (such as the reference manual entries for module, or object(continued)), it is correct. In other cases (such as the entries for name, or the first column of object), the dddl.../dl wrapper is left out, so that the subentries appear to be normal entries that just happen to be out of alphabetical order. -- Comment By: Fred L. Drake, Jr. (fdrake) Date: 2006-07-29 20:15 Message: Logged In: YES user_id=3066 This appears to be fine in the 2.4.3 and development versions of the documentation. If I'm missing something, please be specific about what you think is wrong. -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=960860group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[ python-Bugs-1495229 ] W3C - Python DOM type mapping docs need updating
Bugs item #1495229, was opened at 2006-05-25 19:33 Message generated for change (Comment added) made by fdrake You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1495229group_id=5470 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Documentation Group: Python 2.5 Status: Open Resolution: None Priority: 5 Submitted By: Mike Brown (mike_j_brown) Assigned to: Martin v. Löwis (loewis) Summary: W3C - Python DOM type mapping docs need updating Initial Comment: I believe the information at http://docs.python.org/lib/dom-type-mapping.html is outdated; most if not all boolean return values, at least in minidom, are handled as BooleanType, not IntegerType. This should be standard. Sorry, I don't have a patch to submit for this. Should be an easy fix though. -- Comment By: Fred L. Drake, Jr. (fdrake) Date: 2006-07-30 00:56 Message: Logged In: YES user_id=3066 My position on this is that: 1) The docs are not wrong. 2) The docs should be updated to indicate that bool values are returned where appropriate. 3) It is reasonable that Python developers know the relationship between bool and int. That is not something that can reasonably change in Python 2.x. It seems unlikely to change for Python 3000. 4) The strict application of the IDL mapping really hasn't helped in creating a good DOM-like interface for Python. Dealing with the last item isn't within scope for handling this issue. -- Comment By: Mike Brown (mike_j_brown) Date: 2006-06-03 17:01 Message: Logged In: YES user_id=371366 If answer #1 is chosen and the others rejected, then the docs remain misleading, since the average reader just wants to know what types to expect from an implementation (or should code into their implementation), and shouldn't be expected to know the relationship between Booleans and integers. Is it even reasonable to expect that this relationship will always be true? In any case, I'd rather see it made explicit as to why minidom doesn't seem, at first, to respect the type mapping, at least in current implementations. It could be as simple as adding Andrew's comment, phrased as This DOM mapping is derived from the IDL mapping for Python, which predates the introduction of BooleanType, which is currently a subtype of IntegerType. Implementations may use either type. or some such. -- Comment By: A.M. Kuchling (akuchling) Date: 2006-06-03 16:42 Message: Logged In: YES user_id=11375 Martin, you probably need to make a pronouncement on this. The DOM mapping is supposed to be derived from the IDL mapping for Python, which predates Booleans, but methods such as hasChildNodes() return True/False. I can see at least three answers: 1) Booleans are subtypes of integers, so the docs are not wrong. 2) The docs are wrong and should say Boolean. 3) The methods should be returning regular 0 and 1, not True and False, and should be changed. -- You can respond by visiting: https://sourceforge.net/tracker/?func=detailatid=105470aid=1495229group_id=5470 ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
