Re: understanding htmllib

[Fredrik Lundh]

David Bear wrote:

> I'm trying to understand how to use the HTMLParser in htmllib but I'm not
> seeing enough examples.
> 
> I just want to grab the contents of everything enclosed in a '' tag,
> i.e. items from where  begins to where  ends. I start by doing
> 
> class HTMLBody(HTMLParser):
>def __init__(self):
>   self.contents = []
> 
>def handle_starttag()..
> 
> Now I'm stuck. I cant see that there is a method on handle_starttag that
> would return everthing to the end tag. And I haven't seen anything on how
> to define my one handle_unknowntag..

htmllib is designed to be used together with a formatting object.  if 
you just want to work with tags, use sgmllib instead.  some variation of 
the SGMLFilter example on this page might be what you need:

 http://effbot.org/librarybook/sgmllib.htm

if you want a DOM-like structure instead of an event stream, use

 http://www.crummy.com/software/BeautifulSoup/

usage:

 >>> import BeautifulSoup as BS
 >>> soup = BS.BeautifulSoup(open("page.html"))
 >>> str(soup.body)
'\nBody Title\nParagraph\n'
 >>> soup.body.renderContents()
'\nBody Title\nParagraph\n'



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Re: Compiling binaries

[Fredrik Lundh]

Henrique Nakashima wrote:

> Hi, I'm trying to find a way to compile .py files into linux binaries, 
> so that i can distribute a program without having the user install 
> python itself. Is there a way to do that?

http://effbot.org/zone/python-compile.htm



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Re: Need help with syntax on inheritance.

[Calvin Spealman]

On 3 Oct 2006 19:09:53 -0700, SpreadTooThin <[EMAIL PROTECTED]> wrote:
> If you are deriving a new class from another class,
> that you must (I assume) know the initializer of the other class.
>
> So in myClass
>
> import array
> class myClass(arrary.array):
>def __init__(self, now here I need to put array's constructor
> parameters..., then mine):
>   array.array.__init__(self, typecode[, initializer])
>   self.mine = mine
>
> So I'm confused...
> array has a typecode parameter and an optional initiializer...
> So could you help me with the class construction here please?

If you need to take the same parameters as your super-class, and it
includes optional positional parameters, then simply call with
keywords to avoid the optional parameter:

   myClass(typecode, mine=something)

It has less to do with defining the parameters than calling the function.
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Re: Roundup Issue Tracker release 1.1.3

[metaperl . etc]

Richard Jones wrote:
> I'm proud to release version 1.1.3 of Roundup.
> five database back-ends (anydbm, sqlite, metakit,
> mysql and postgresql).

That ORM is pretty impressive:
http://roundup.sourceforge.net/doc-1.0/design.html#roundup-database

I like how easy it is to specify m-to-n relations.

Is it possible to have a table with a multi-column primary key?

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Re: switching to numpy and failing, a user story

[Travis E. Oliphant]

[EMAIL PROTECTED] wrote:
> After using numeric for almost ten years, I decided to attempt to
> switch a large codebase (python and C++) to using numpy. Here's are
> some comments about how that went.
> 
> - The code to automatically switch python stuff over just kind of
> works. But it was a 90% solution, I could do the rest by hand. Of
> course, the problem is that then the code is still using the old
> numeric API, so it's not a long term solution. Unfortunately, to switch
> to the numpy API one needs documentation, which is a problem; see
> below.

I'm glad to hear of your experiences (good and bad).  We need feedback 
exactly from users like you in order to improve things.  Yep, the code 
converter is a 80% solution, but it does work.  Improvements are always 
welcome.

> 
> - Well, ok, the automatic switching code doesn't really work all that
> well... my uses of RandomArray still work, but they generate different
> numbers. The underlying random-number generator must have changed. I'm
> sure that it's "better" now, but it's different. This is a major pain
> for my regression tests that rely on seeding the random number
> generator and getting particular results. But that's ok, I can update
> the regressions for the new RNG.
>

You definitely can't expect the same random number generator.  The new 
one (thanks to Robert Kern) is quite good.


> - My extension modules just won't build because the new numpy stuff
> lives in a different location from where Numeric used to live.

This is an easy one and is documented in lots of places on the new 
http://www.scipy.org site.  Plus, people are always willing to help out 
if you just ask.  The numpy-discussion list is quite active.  Don't be 
shy.


> - I guess I should just buy the documentation. I don't like this idea,
> because I think it's counter-productive to the project to have payware
> docs (would Python be successful if you had to buy the documentation? I
> don't think so), but that's the way this project goes.

It's probably better to call it "complete documentation."  Normal 
open-source documentation is available from http://www.scipy.org.  There 
are lots of people who have helped it.  I had to do something to at 
least pretend to justify the time NumPy took me to the people who care 
about how I spend my time (including my family).   This was the best I 
could come up with.

  I'm doubly
> unhappy about it because they payment system is using Paypal and I
> don't like Paypal at all, but I guess that's just the way it goes. Oh,
> wait, I *can't* buy the docs because I'm not in the US and the payment
> page requires a US address.

Is that really true?  A lot of people not living in the U.S. have used 
Paypal successfully.  When difficulties arise, communicating with me 
your difficulty is usually productive.

  I give up; I guess NumPy is only for people living in the US.

Definitely not true.  People in Singapore, Japan, Ghana, South Africa, 
France, Germany, New Zealand, Australia, and many other countries are 
using NumPy successfully.  Gratefully, a few have contributed by buying 
the book, but a lot more have downloaded and are successfully using it.

I'm sorry about your experience, you definitely don't *have* to buy the 
book to use NumPy.  Just like you don't *have* to buy any Python book to 
use Python.  The amount of documentation for NumPy is growing and I 
expect that trend to continue.   There is a lot of information in the 
source file.

> 
> I guess I'll come back to NumPy in 2010, when the docs are available.
> 

Or just ask on the mailing lists, use the numpy.oldnumeric interface 
(the differences are all documented in the first few pages of my book 
which is available for free now).

Thanks,

-Travis

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Re: Python to use a non open source bug tracker?

[Giovanni Bajo]

Martin v. Löwis wrote:

>> I hope this
>> recommendation from the "PSF infrastructure committee" is rejected.
>
> That is very very unlikely. Who would reject it, and why?

The community, and I am impressed you do not want to understand the "why". It
is an extremely bad picture for an open source flag like Python to go to a
vendor for such an easy requirement as a bug database. I am seriously concerned
that the PSF infrastructure committee EVER considered non open-source
applications for this. In fact, I thought that was an implicit requirement in
the selection.

There are many open source applications around. They might not be the best, but
at least they are yours, and not of some third party software vendors with its
own interests.
-- 
Giovanni Bajo


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Re: Python to use a non open source bug tracker?

[Giovanni Bajo]

Fredrik Lundh wrote:

> that's just not true.  lots of people have voiced concerns over using
> closed-sourced stuff originally designed for enterprise-level Java
> users for an application domain where Python has several widely used
> agile alternatives to chose from.

Frankly, I don't give a damn about the language the application is coded in, as
long as it is OUR application and not an application of a private company which
we do not own.

Even though you are totally right.
-- 
Giovanni Bajo


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Re: Python to use a non open source bug tracker?

[Giovanni Bajo]

[EMAIL PROTECTED] wrote:

> Giovanni Bajo wrote:
>
>> Does this smell "Bitkeeper fiasco" to anyone else than me?
>
> I can't understand why people waste time arguing this stuff.
>
> Use whatever tool is best at it's job... if it's not written in Python
> it doesn't mean that Python is not good for the task, only that there
> hasn't been any Python programmer that applied himself to the problem
> hard enough.

This is not against using a tool not written in Java. This is against using a
tool which is not FLOSS.
-- 
Giovanni Bajo


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Re: Python to use a non open source bug tracker?

[Giovanni Bajo]

A.M. Kuchling wrote:

>> ... using a non open source tracker (called JIRA - never heard
>> before of course) for Python itself.
>
> Other projects do use it; see
>  for a partial list, and a
> link to the Apache Software Foundation's issue trackers.

which, in my humble opinion, is just a list of other examples of projects which
are misguided. People seem to have no idea when a company is sold, when a CEO
is changed, or something like that. Hhistory's repeating, but hackers are not
learning.

>> Does this smell "Bitkeeper fiasco" to anyone else than me?
>
> The committee did expect this recommendation to be controversial.  :)

I guess :)

In fact, I have a deepest hope that this recommendation was just a fake just to
get people setup a roundup installation...
-- 
Giovanni Bajo


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Re: Python to use a non open source bug tracker?

[Giovanni Bajo]

Martin v. Löwis wrote:

> It's significantly different from the Bitkeeper fiasco in two
> important
> ways:
> 1. Bitkeeper is a source revisioning system, so it is similar to CVS
>and Subversion. This project here is "just" the bug tracker, which
>is of lesser  importance. If we move to a different one some day, a
>certain amount of data lossage might be acceptable (e.g. we now
>likely lose the "history" of status changes and file attachments on
>each report). An export of all data is high on the requirements
>list, as Fredrik points out.

I understand your point. OTOH, exactly because the tracker system is a far
lesser importance, it's amazing there is *ever* a need to evaluate non-FLOSS
solutions, when there are so many good free solutions around. Instead of
recommending a closed source solution, you could have recommended Roundup *and*
explained there is a need for funding and/or volunteers before the migration
can happen.

You might also be understimating how negative could be the reaction from the
open-source community to such a move.
-- 
Giovanni Bajo


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Re: Best way to handle large lists?

[durumdara]

Hi !
> Thanks Jeremy. I am in the process of converting my stuff to use sets! I
> wouldn't have thought it would have made that big a deal! I guess it is
> live and learn.
>   
If you have simplified records with big amount of data, you can trying 
dbhash. With this you don't get out from memory...

dd


import dbhash
import time
import random
import gc
import sys

itemcount = 25

db = dbhash.open('test.dbh','w')
for i in range(itemcount):
db[str(i)] = str(i)

littlelist = []
littleset = set()

while len(littlelist) < 1000:
x = str(random.randint(0, itemcount-1))
if not (x in littlelist):
littlelist.append(x)
littleset.add(x)

def DBHash():
gc.collect()
hk = db.has_key
st = time.time()
newlist = []
for val in littlelist:
if hk(val):
newlist.append(val)
et = time.time()
print "Size", len(newlist)
newlist.sort()
print "Hash", hash(str(newlist))
print "Time", "%04f"%(et-st)
print

def Set():
gc.collect()
largeset = set()
for i in range(itemcount):
largeset.add(str(i))

st = time.time()
newset = largeset.intersection(littleset)
newsetlist = []
while newset:
newsetlist.append(newset.pop())
et = time.time()
print "Size", len(newsetlist)
newsetlist.sort()
print "Hash", hash(str(newsetlist))
print "Time", "%04f"%(et-st)

DBHash()
Set()



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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-03, LaundroMat <[EMAIL PROTECTED]> wrote:
> Suppose I have this function:
>
> def f(var=1):
> return var*2
>
> What value do I have to pass to f() if I want it to evaluate var to 1?
> I know that f() will return 2, but what if I absolutely want to pass a
> value to f()? "None" doesn't seem to work..
>
> Thanks in advance.

One possible way to do what I think you want is to code as follows:

class Default (object):
  pass

def f(var=Default):
  if var is Default:
var = 1
  return var * 2

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Re: What kind of program is this

[Fredrik Lundh]

John Smith wrote:

> what kind of program is this?

http://en.wikipedia.org/wiki/JAPH

 



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Re: Roundup Issue Tracker release 1.1.3

[Richard Jones]

[EMAIL PROTECTED] wrote:
> Richard Jones wrote:
>> I'm proud to release version 1.1.3 of Roundup.
>> five database back-ends (anydbm, sqlite, metakit,
>> mysql and postgresql).
> 
> That ORM is pretty impressive:
> http://roundup.sourceforge.net/doc-1.0/design.html#roundup-database
> [snip]
> Is it possible to have a table with a multi-column primary key?

No, it's not designed for that level of complexity.


   Richard

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Re: What value should be passed to make a function use the default argument value?

[LaundroMat]

Rob De Almeida wrote:

> LaundroMat wrote:
> > Suppose I have this function:
> >
> > def f(var=1):
> > return var*2
> >
> > What value do I have to pass to f() if I want it to evaluate var to 1?
> > I know that f() will return 2, but what if I absolutely want to pass a
> > value to f()? "None" doesn't seem to work..
>
> If you *absolutely* want to pass a value and you don't know the default
> value (otherwise you could just pass it):
>
> >>> import inspect
> >>> v = inspect.getargspec(f)[3][0] # first default value
> >>> f(v)
> 2

I have in fact a bunch of functions that all pass similar information
to one main function. That function takes (amongst others) a template
variable. If it's not being passed, it is set to a default value by the
function called upon.

For the moment, whenever a function calls the main function, I check
whether the calling function has the template variable set:

>>> if template:
>>>return mainFunction(var, template)
>>> else:
>>>return mainFunction(var)

Now, I thought this isn't the cleanest way to do things; so I was
looking for ways to initialize the template variable, so that I could
always return mainFunction(var, template). mainFunction() would then
assign the default value to template.

>From your answers, this seems to be impossible. The minute my variable
is initialised, there's no way I can have mainFunction() assign a value
without explicitly asking it to do so.

I guess the best way would then be to change mainFunction from:
>>> def mainFunction(var, template='base'):
to
>>> def mainFunction(var, template):
>>> if len(template)=0:
>>>template = 'base'

and have the calling functions call mainFunction (var, template) and
initialise template to ''.

I still have that nagging feeling nicer code could be written to solve
this, but I won't try to lose any sleep over it.

Thanks for all the replies.

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hex sending

[hiroc]

s.send("abc") # send test string

I need to send hex:"10 06 00 0f 02 bc d1" instead of "abc"

hoW?

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Re: Need help with syntax on inheritance.

[Peter Otten]

SpreadTooThin wrote:

> If you are deriving a new class from another class,
> that you must (I assume) know the initializer of the other class.
> 
> So in myClass
> 
> import array
> class myClass(arrary.array):
>def __init__(self, now here I need to put array's constructor
> parameters..., then mine):
>   array.array.__init__(self, typecode[, initializer])
>   self.mine = mine
> 
> So I'm confused...
> array has a typecode parameter and an optional initiializer...
> So could you help me with the class construction here please?

Normally you would do 

# won't work
class Array(array.array):
def __init__(self, typecode, initalizer=(), mine=None):
array.array.__init__(self, typecode, initializer)
self.mine = mine

However, array.array is a bit harder to subclass:

# should work
class Array(array.array):
def __new__(cls, typecode, initializer=(), mine=None):
return array.array.__new__(cls, typecode, initializer)
def __init__(self, typecode, initializer=(), mine=None):
array.array.__init__(self, typecode, initializer) 
self.mine = mine

See if you can get away by making the array an attribute of your class
instead.

Peter
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Re: was python implemented as a object oriented langage at the beginning ?

[Bruno Desthuilliers]

has wrote:
> Python's type/class
> distinction 

Which "type/class" distinction ?


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p in '[EMAIL PROTECTED]'.split('@')])"
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Re: hex sending

[Fredrik Lundh]

"hiroc" wrote:

> s.send("abc") # send test string
>
> I need to send hex:"10 06 00 0f 02 bc d1" instead of "abc"

do you want to send seven binary bytes, or pairs of hexadecimal characters
separated by whitespace ?

how do you map from "abc" to "10 06 00 0f 02 bc d1", by the way?  what
encoding is that?

 



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Re: hex sending

[hiroc]

I want send pairs of hexadecimal characters, abc is only my test hex
char is real





Fredrik Lundh wrote:
> "hiroc" wrote:
>
> > s.send("abc") # send test string
> >
> > I need to send hex:"10 06 00 0f 02 bc d1" instead of "abc"
>
> do you want to send seven binary bytes, or pairs of hexadecimal characters
> separated by whitespace ?
>
> how do you map from "abc" to "10 06 00 0f 02 bc d1", by the way?  what
> encoding is that?
> 
> 

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Re: can't open chm files all of a sudden

[John Machin]

John Salerno wrote:
> John Salerno wrote:
> > Hi all. I apologize since this is only remotely Python related, but I
> > hope someone might now the solution.
> >
> > I tried opening my Python chm docs just now, as well as the one for
> > wxPython, and both are giving me an error dialog when I double-click
> > them and I can't open them. This happened apparently for no reason, just
> > today. I even reset but that didn't help.
> >
> > Does anyone know what might cause this,

Many things might cause an error dialogue -- further info needed.

>>  and if it could affect the rest
> > of Python or wxPython as well?

It could. Depends on what "it" is.  Have you noticed any symptoms of
other problems?

> P.S. Here is part of the error, but not the long detailed section:
>
> AppName: hh.exeAppVer: 5.2.3790.2453   ModName: itss.dll
> ModVer: 5.2.3790.2453  Offset: 6bec
>
> The same thing shows up for both files.


1. This is like telling us only the last source file name and line
number in a Python traceback -- not very useful, especially w/o the
source.
Care to tell us what the text of the error message was?

2. Are these events resulting in a dump in your Dr Watson file
(C:\Documents and Settings\All Users\Application Data\Microsoft\Dr
Watson\drwtsn32.log)? Each dump starts with something like this:
"""
Application exception occurred:
App: C:\Program Files\Hewlett-Packard\HP OfficeJet T
Series\Bin\HPOstr05.exe (pid=2172)
When: 2/09/2006 @ 05:35:58.515
Exception number: c005 (access violation)
"""
... search for hh.exe

3. Have you been installing other software since this last worked?
Fiddling with your path?

4. Have you done a full virus and spy-ware scan? Do you regularly
install Windows updates from Microsoft?

5. C:\windows\help has many .chm files -- pick a couple at random; do
you get the same problem with them?

6. Fire up a Comamnd Prompt window, and type this in:

\windows\hh \python25\doc\python25.chm
\windows\hh \windows\help\whatever.chm

Any difference to the results from double-click launch method?

...

I suspect that this is a narrowly focussed problem, probably a stuffed
DLL or a DLL conflict. I tried profiling hh.exe opening
c:\python25\doc\python25.chm with the dependency walker, and it visited
a kazillion DLLs before it got to itss.dll and another kazillion after
that till it stopped awaiting user input. If we don't get a clue from
your answers to the above questions, it would probably be worth doing
that on your machine. You could even do it yourself: google "dependency
walker" and follow your nose :-)

HTH,
John

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Python/Tkinter crash.

[Hendrik van Rooyen]

Hi,

I get the following:

[EMAIL PROTECTED]:~/Controller/lib> python display.py
UpdateStringProc should not be invoked for type font
Aborted

and I am back at the bash prompt - this is most frustrating, as there is no
friendly traceback to help me guess where its coming from.

And what is worse, the script runs for a varying time before it simply exits
like this.

What can I do to dig deeper to try to find a clue? - I don't even know if its
Python, Tkinter or Linux...

Some background:

The application is a prototype gui for a controller of an injection moulding
machine.
It has two rows of five buttons across the top, and a canvas containing various
objects over the rest of the screen.
Extensive use is made of configure to change the text of the buttons, as well as
their command bindings,
to keep "the state of the system" current - its quite a hack at this time, as I
am still experimenting with getting the interface intuitive.
On the canvas, there are multiple instances of a Meter class to show things like
temperatures and pressures,
as well as a schematic representation of the machine, created out of polygons
and lines.
The schematic, as well as the Meters, are crudely animated by deleting and
redrawing the objects repetitively with slightly different parameters in
response to button presses. This is done by starting different threads to
implement the various motions, which repetitively call kill and draw methods in
the main app, after which they (the threads) commit seppoku by returning.

Everything seems to work fine. - there is a thread that runs to move the meter
values around continuously, and this has been stable for some time now, and I
can get the various "machine" parts to move around the screen by pushing the
buttons.
The trouble occurs when I put the "machine" into Auto mode, simulating the
various motions in a loop, - it runs for anything from a few tens to a few
hundreds of cycles before handing in its dinner pail like this.

Any Ideas on what to do next to find the culprit?

- Hendrik

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Re: Best way to handle large lists?

[GHUM]

> > Maybe the application should use sets instead of lists for these
> > collections.
> What would sets do for me over lists?

searching for an element in a list is O(n)
searching for an element in a set is O(1)   (for reasonable distributed
elements)

Harald

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Re: Best way to handle large lists?

[Hari Sekhon]

So are you saying that using a dict means a faster search since you
only need to look up one value?

I would think that you would have to look through the keys and stop at
the first key that matches since each key has to be uniq, so perhaps if
it is nearer the front of the set of keys then perhaps it would be a
quicker lookup?

On the other hand, if it is nearer the end of the set of keys would it
not be slower?

Does this make it more dependent on the search order whether a list or
a dict is faster? Or am I completely on the wrong track?

-h
Hari Sekhon


Fredrik Lundh wrote:

  Hari Sekhon wrote:

  
  
That is surprising since I read on this list recently that lists were 
faster than dicts

  
  
depends on what you're doing with them, of course.

  
  
It was one reason that was cited as to why local vars are better than

  
   > global vars.

L[int] is indeed a bit faster than D[string] (but not much), but that 
doesn't mean that you can loop over *all* items in a list faster than 
you can look up a single key in a dictionary.



  



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Re: tkinter to mpeg

[Alexander Schliep]

[EMAIL PROTECTED] (Cameron Laird) writes:


> In article <[EMAIL PROTECTED]>,
> Thomas Jollans <[EMAIL PROTECTED]> wrote:
>>On Mon, 02 Oct 2006 09:18:13 -0700, "dug" <[EMAIL PROTECTED]> let this
>>slip:
>>> I have a small program that moves some shapes around a tkinter canvas.
>>> Is there any way to save the output in a movie file, maybe mpeg?
>>
>>you can record any app with special programs designed for the job, such as
>>vnc2swf (which produces macromedia flash), vncrec (which produces a
>>special format readable by transcode) or istanbul (which produces
>>ogg/theora). I doubt Tk would have a special mechanism to do this.
>   .
> I've actually been thinking about implementing just such a special
> mechanism.  Let me know if there's sufficient interest.

I think it would be most helpful to have a general way to dump the contents
of a Tkinter canvas including animated elements to some sort of file.
However, I would think that mpeg will look pretty bad compared to SVG.
In fact, as SVG renders much prettier (anti-aliasing etc.) than Tkinter,
the exported file would look much better.

I actually started coding SVG output for Gato (http://gato.sf.net). Some
of the things I realized:
- SVG support is somewhat limited on *nix.
- The SMIL type animations are even less supported. One would have to
  resort to javascript. There is SmilScript which implements a SMIL
  subset for Firefox 2.0? 
- Due to a bug in the SVG 1.1 specification multi-colored lines with 
  same color arrow-heads are difficult to draw. Supposedly, this will
  be fixed in 1.2.
- The geometry works differently in SVG compared to Tk. Arrow heads
  are stuck onto the end of a line for example. 

It would be trivial to wrap the Tkinter canvas in an object which
records what function is called when. For the basic canvas
items mapping this to SVG is quite straightforward. 

Alexander

PS: There is some python code to output SVG, which I didn't use since
I wanted to work on my applications abstraction level. 
http://www2.sfk.nl/svg 
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/325823



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http://algorithmics.molgen.mpg.de
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Re: hex sending

[Stoune]

hiroc wrote:
> I want send pairs of hexadecimal characters, abc is only my test hex
> char is real
>

Possibly this code helps to you:

import binascii

binascii.hexlify('hello worlds')

Output: '68656c6c6f20776f726c6473'

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Re: python html rendering

[GHUM]

Pierre,

> Hi, Im looking for a way to display some python code
> in html: with correct indentation, possibly syntax hiliting, dealing
> correctly with multi-line comment,


the usual way is to create your own web-framework


If it is just "some" Python code and you have to do it "once", just
look at scite. Scite can colour your code, and you can export it as
HTML.

Harald

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Re: What value should be passed to make a function use the default argument value?

[Paul Rubin]

"LaundroMat" <[EMAIL PROTECTED]> writes:
> def f(var=1):
> return var*2
> 
> What value do I have to pass to f() if I want it to evaluate var to 1?
> I know that f() will return 2, but what if I absolutely want to pass a
> value to f()? "None" doesn't seem to work..

I don't understand your question.  You can call f(var=1) just fine.
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Re: Best way to handle large lists?

[Fredrik Lundh]

Hari Sekhon wrote:

> So are you saying that using a dict means a faster search since you only
> need to look up one value?
>
> I would think that you would have to look through the keys and stop at
> the first key that matches since each key has to be uniq, so perhaps if
> it is nearer the front of the set of keys then perhaps it would be a
> quicker lookup?

http://en.wikipedia.org/wiki/Hash_table

 



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Equal to Anything

[Simon Brunning]

For the purposes of a little test utility that we use, I need an
object that evaluates as equal to anything. (I realise that this is a
bad idea in some ways, breaking the equals/hashcode invariant and so
forth, but I'm hoping that I can get away with it in this case.) It
seems a simple enough task at first:

>>> class EqualAnything(object):
... def __eq__(self, other):
... return True
...
>>> spam = EqualAnything()
>>> spam == 1
True
>>> spam == "hello!"
True
>>> spam == datetime.datetime.now()
True
>>> 1 == spam
True
>>> "hello!" == spam
True

But...

>>> datetime.datetime.now() == spam
False

I'm fairly sure that I know what is going on here - the left hand side
object is getting first stab at the equality test, and understandably,
it's saying "Nah". But is there anything that I can do about it?

-- 
Cheers,
Simon B,
[EMAIL PROTECTED]
http://www.brunningonline.net/simon/blog/
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Re: switching to numpy and failing, a user story

[sturlamolden]

Travis E. Oliphant wrote:

> Definitely not true.  People in Singapore, Japan, Ghana, South Africa,
> France, Germany, New Zealand, Australia, and many other countries are
> using NumPy successfully.  Gratefully, a few have contributed by buying
> the book, but a lot more have downloaded and are successfully using it.

>From the PayPal site for purchasing your book: "Select Payment Type:
Don't have a PayPal account? You don't need an account. Pay securely
using your credit card." I bought the book from Norway using my credit
card, and received the pdf file soon afterwards. Obviously the book can
be bought without a PayPal account or a us billing address.

NumPy is the most versatile array type I have worked with, including
those of Matlab and Fortran 95. In particular, the explosive memory use
of Matlab is avoided. Keep up the good work!

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Re: What kind of program is this

[Wildemar Wildenburger]

Fredrik Lundh wrote:
> John Smith wrote:
>> what kind of program is this?
> 
> http://en.wikipedia.org/wiki/JAPH

You computer guys crack me up!
:D

wildemar
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Re: What kind of program is this

[skip]

Fredrik> http://en.wikipedia.org/wiki/JAPH

That's an interesting JAPH written with only punctuation...

Skip
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Re: Python to use a non open source bug tracker?

[Nick Craig-Wood]

[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>  And i dunno what the case against Trac is (it looks a fine tool for my
>  small projects) but probably it's not good enough for python.org

Trac is really good in my experience.

  http://trac.edgewall.org/

Python.org has already moved to svn so trac is surely the next part of
the equation.  Having an integrated Bugtracker / Wiki / Svn repository
browser is very helpful.

We use it for all our commercial work.

It is also in use by MythTV which judging by the volume of its mailing
lists is about or more active a project than python.

  http://svn.mythtv.org/trac/

A nice extra is that it is written in python.

-- 
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Re: Equal to Anything

[Duncan Booth]

"Simon Brunning" <[EMAIL PROTECTED]> wrote:

> I'm fairly sure that I know what is going on here - the left hand side
> object is getting first stab at the equality test, and understandably,
> it's saying "Nah". But is there anything that I can do about it?
> 
Not in general, no. If you could, and someone else created a 
NotEqualAnything class with the identical definition to EqualAnything 
except it returns False, then which would win? 

Sorry, but the left hand value wins unless it volunteers otherwise.
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Re: python html rendering

[Gerard Flanagan]

Fredrik Lundh wrote:

> Pierre Imbaud wrote:
>
> > I rather thought of some module built on python parser, generating html
> > or xml, ideally customizable.
>
> see "colorizer.py" and "element_colorizer.py" in this directory:
>
>  http://svn.effbot.python-hosting.com/stuff/sandbox/pythondoc
>
> 

+1 for colorizer.py  (-1 for the american spelling ;-) )

it works a treat.  examples here:

http://www.gflanagan.net/site/python/utils/htmlbuilder/index.html

maybe the HTML generator on this page might be useful to you (OP), and
there's a quick py2html there as well.

(Thanks Fredrik!)

Gerard

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Getting Pygopherd to work under Mac OS X

[mattabat]

Hello,
Could someone *please* show us poor Mac users how to install and run
Pygopherd successfully under Mac OS X? The latest version 2.0.4, as
found at http://freshmeat.net/projects/pygopherd/ is my bane. I think I
talked to John Goerzen, the maintainer, a while back but nothing came
of it.
I've tried this twice now, following the instructions given and have
found nothing but grief and many errors.
For a Python app it seems to be rather platform dependant! Does
Pygopherd need to be altered somehow to work under OS X?
If Pygopherd is a lost cause, can someone recommend another
*maintained* gopher daemon with instructions that would allow its' use
under OS X?

--
mattabat <[EMAIL PROTECTED]>

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Re: python html rendering

[Duncan Booth]

"GHUM" <[EMAIL PROTECTED]> wrote:

>> Hi, Im looking for a way to display some python code
>> in html: with correct indentation, possibly syntax hiliting, dealing
>> correctly with multi-line comment,
> 
>
> the usual way is to create your own web-framework
>

Or you could use an existing web framework: Plone has the ability to 
colour python code built-in.

> If it is just "some" Python code and you have to do it "once", just
> look at scite. Scite can colour your code, and you can export it as
> HTML.

and if you need it more than once you can always find one of the existing 
chunks of colouring code and modify/reuse it. See Plone's 
PortalTransforms/transforms/python.py, or the MoinMoin code it was cribbed 
from.

https://svn.plone.org/svn/archetypes/PortalTransforms/trunk/transforms/python.py


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Re: Manipulate PDFs

[Paul Boddie]

Cameron Laird wrote:
>
> http://www.easysw.com/htmldoc/ >.  While we STRONGLY emphasize
> free software in our installations, HTMLDOC has worked out great
> for us.  Easy Software has consistently provided good service.

Well, HTMLDOC does appear to be available under the GPL, too:

http://www.htmldoc.org/

Paul

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string: __iter__()?

[mrquantum]

Hello!

Just for curiosity i'd like to know why strings don't support the
iteration protocoll!? Is there some deeper reason for this?

>>> hasattr('SomeString', '__iter__')
False

In Python 2.5 it's actually simple to obtain one:

>>> myIter = (c for c in 'SomeString')
>>> myIter.next()
'S'

Thanks for info!

Chris
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Re: string: __iter__()?

[Fredrik Lundh]

mrquantum wrote:

> Just for curiosity i'd like to know why strings don't support the
> iteration protocoll!?

really?  iter("SomeString") works just fine for me.






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Re: py2app console

[James Stroud]

Dave Opstad wrote:
> In article <[EMAIL PROTECTED]>,
>  James Stroud <[EMAIL PROTECTED]> wrote:
> 
>> Does anyone know of the most straightforward way to get rid of the 
>> intensely annoying "console" window that py2app feels so compelled to 
>> create?
> 
> I include this code in my apps:
> 
> if (sys.platform != "win32") and hasattr(sys, 'frozen'):
> root.tk.call('console', 'hide')
> 
> That hides the console in py2app applications.
> 
> Dave

Yes! Thank you! I just now have gotten a chance to try it. It works 
beautifully and simply.

Again, many thanks for your help!

James
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Re: python html rendering

[Paul Boddie]

Pierre Imbaud wrote:
> Hi, Im looking for a way to display some python code
> in html: with correct indentation, possibly syntax hiliting, dealing
> correctly with multi-line comment, and... generating valid html code if
> the python code itself deals with html (hence manipulates tag litterals.
> Thanks for your help!

Take a look at Highlight [1], a program used successfully in the
otherwise Python-based open source project ViewVC [2]. Messing around
with IDEs (as others have suggested) just isn't necessary here.

Paul

[1] http://www.andre-simon.de/
[2] http://www.viewvc.org/

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Re: string: __iter__()?

[Paul Rubin]

"mrquantum" <[EMAIL PROTECTED]> writes:
> Just for curiosity i'd like to know why strings don't support the
> iteration protocoll!? Is there some deeper reason for this?
> 
> >>> hasattr('SomeString', '__iter__')
> False

It is a little but odd.  But at least in 2.3.4:

Python 2.3.4 (#1, Feb  2 2005, 12:11:53) 
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = iter('hi there')
>>> a

>>> print [x for x in a]
['h', 'i', ' ', 't', 'h', 'e', 'r', 'e']
>>> 

So it looks like the iter is still there, but comes from some older
layer of the implementation.  
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Re: string: __iter__()?

[mrquantum]

Am Wed, 04 Oct 2006 12:03:41 +0200 schrieb Fredrik Lundh:

> 
> really?  iter("SomeString") works just fine for me.
> 

Hmm, right!

But then why doesn't dir('SomeString') show an __iter__ method? Seems to
be implmented differently than with e.g. lists? Know why?
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Re: What value should be passed to make a function use the default argument value?

[LaundroMat]

Antoon Pardon wrote:

> The problem is like the following.
>
> def f(var=1):
>   return var*2
>
> def g():
>   arg = None
>   try:
> arg = Try_Processing() / 3 + 1
>   except Nothing_To_Process:
> pass
>   if arg is None:
> return f()
>   else:
> return f(arg)
>
> Now in this case you could start by assigning arg the value 1 and
> eliminate the if test. However that only works if you know the
> default value for the argument. What he seems to be asking for
> is if there is an object, (let as call it Default), that would
> make code like:
>
>   def f(var=1):
>
> Equivallent to:
>
>   def f(var=Default)
> if var is Default)
>   var = 1
>
> So that we could write the following without the need of the
> f's default value.
>
>   def g():
> arg = Default
>   try:
> arg = Try_Processing() / 3 + 1
>   except Nothing_To_Process:
> pass
>   f(arg)
> 
> -- 
> Antoon Pardon

Exactly. Thanks for helping out.

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Improving telnetlib

[Matthew Warren]

 
Hi,

I use telnetlib in an app I am writing, and would like to add
functionality to it to support interactive terminal sessions , IE: be
able to 'vi' a file.

Currently it seems telnetlib isnt quite sophisticated enoguh to support
such a thing.

The trouble is, I havent got a clue where to start and would appreciate
a couple of pointers to get me going...




Thanks,

Matt.


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Re: Python to use a non open source bug tracker?

[Richard Jones]

Nick Craig-Wood wrote:
> [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>>  And i dunno what the case against Trac is (it looks a fine tool for my
>>  small projects) but probably it's not good enough for python.org
> 
> Trac is really good in my experience.

Trac was considered.


> A nice extra is that it is written in python.

So are Roundup and Launchpad, two of the other three trackers considered.


Richard

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Re: What value should be passed to make a function use the default argument value?

[Paul Rubin]

Antoon Pardon <[EMAIL PROTECTED]> writes:
> Now in this case you could start by assigning arg the value 1 and
> eliminate the if test. However that only works if you know the
> default value for the argument. What he seems to be asking for
> is if there is an object, (let as call it Default), that would
> make code like:
> 
>   def f(var=1):
> 
> Equivallent to:
> 
>   def f(var=Default)
> if var is Default)
>   var = 1

Oh, I see.  Yes, the OP should just use a distinct default value
instead of 1.  I usually do this with

   sentinel = object()

   def f(var=sentinel):
 if var is sentinel:
   # f was called without an arg 
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Re: string: __iter__()?

[Peter Otten]

mrquantum wrote:

> Am Wed, 04 Oct 2006 12:03:41 +0200 schrieb Fredrik Lundh:

>> really?  iter("SomeString") works just fine for me.

> But then why doesn't dir('SomeString') show an __iter__ method? Seems to
> be implmented differently than with e.g. lists? 

The older pre-__iter__() iteration style relying on __getitem__() still
works:

>>> class A:
... def __getitem__(self, index):
... return [3,2,1][index]
...
>>> for item in A():
... print item
...
3
2
1

> Know why?

No idea. Perhaps nobody cared?

Peter
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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-04, Paul Rubin  wrote:
> "LaundroMat" <[EMAIL PROTECTED]> writes:
>> def f(var=1):
>> return var*2
>> 
>> What value do I have to pass to f() if I want it to evaluate var to 1?
>> I know that f() will return 2, but what if I absolutely want to pass a
>> value to f()? "None" doesn't seem to work..
>
> I don't understand your question.  You can call f(var=1) just fine.

The problem is like the following.

def f(var=1):
  return var*2

def g():
  arg = None
  try:
arg = Try_Processing() / 3 + 1
  except Nothing_To_Process:
pass
  if arg is None:
return f()
  else:
return f(arg)

Now in this case you could start by assigning arg the value 1 and
eliminate the if test. However that only works if you know the
default value for the argument. What he seems to be asking for
is if there is an object, (let as call it Default), that would
make code like:

  def f(var=1):

Equivallent to:

  def f(var=Default)
if var is Default)
  var = 1

So that we could write the following without the need of the
f's default value.

  def g():
arg = Default
  try:
arg = Try_Processing() / 3 + 1
  except Nothing_To_Process:
pass
  f(arg)

-- 
Antoon Pardon
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Re: What value should be passed to make a function use the default argument value?

[Nick Craig-Wood]

LaundroMat <[EMAIL PROTECTED]> wrote:
>  I have in fact a bunch of functions that all pass similar information
>  to one main function. That function takes (amongst others) a template
>  variable. If it's not being passed, it is set to a default value by the
>  function called upon.
> 
>  For the moment, whenever a function calls the main function, I check
>  whether the calling function has the template variable set:
> 
> >>> if template:
> >>>return mainFunction(var, template)
> >>> else:
> >>>return mainFunction(var)
> 
>  Now, I thought this isn't the cleanest way to do things; so I was
>  looking for ways to initialize the template variable, so that I could
>  always return mainFunction(var, template). mainFunction() would then
>  assign the default value to template.
> 
> From your answers, this seems to be impossible. The minute my variable
>  is initialised, there's no way I can have mainFunction() assign a value
>  without explicitly asking it to do so.
> 
>  I guess the best way would then be to change mainFunction from:
> >>> def mainFunction(var, template='base'):
>  to
> >>> def mainFunction(var, template):
> >>> if len(template)=0:
> >>>template = 'base'
> 
>  and have the calling functions call mainFunction (var, template) and
>  initialise template to ''.

None is the traditional value to use for value not present, then you'd
get this for the function

  def mainFunction(var, template=None):
if template is None:
template = 'base'

And this for the calling bit

  if not_set_properly(template):
 template = None
  return mainFunction(var, template)

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Re: What value should be passed to make a function use the default argument value?

[Nick Craig-Wood]

Antoon Pardon <[EMAIL PROTECTED]> wrote:
>  One possible way to do what I think you want is to code as follows:
> 
>  class Default (object):
>pass

I'd have written

Default = object()

>  def f(var=Default):
>if var is Default:
>  var = 1
>return var * 2
> 

But yes, defining a sentinel like this is a good idea.

-- 
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Re: string: __iter__()?

[mrquantum]

Am Wed, 04 Oct 2006 11:59:07 +0200 schrieb mrquantum:

> Hello!
> 
> Just for curiosity i'd like to know why strings don't support the
> iteration protocoll!? Is there some deeper reason for this?
> 

Sorry, was to hasty by saying "... don't support the iteration
protocol'! Sure they do, as the iter('SomeString') function or the
construction for c in 'SomeString' show.

It's just not implemented by a __iter__ method of the string in question!
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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-04, Paul Rubin  wrote:
> Antoon Pardon <[EMAIL PROTECTED]> writes:
>> Now in this case you could start by assigning arg the value 1 and
>> eliminate the if test. However that only works if you know the
>> default value for the argument. What he seems to be asking for
>> is if there is an object, (let as call it Default), that would
>> make code like:
>> 
>>   def f(var=1):
>> 
>> Equivallent to:
>> 
>>   def f(var=Default)
>> if var is Default)
>>   var = 1
>
> Oh, I see.  Yes, the OP should just use a distinct default value
> instead of 1.  I usually do this with
>
>sentinel = object()
>
>def f(var=sentinel):
>  if var is sentinel:
># f was called without an arg 

But that can only work if you are the author of f. Take the
following code:

  def myrepeat(obj, times = xxx):
return itertools.repeat(obj, times)

What value do I have to substitue for xxx, so that myrepeat
will have the exact same function as itertools.repeat?

-- 
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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-04, Nick Craig-Wood <[EMAIL PROTECTED]> wrote:
> Antoon Pardon <[EMAIL PROTECTED]> wrote:
>>  One possible way to do what I think you want is to code as follows:
>> 
>>  class Default (object):
>>pass
>
> I'd have written
>
> Default = object()
>
>>  def f(var=Default):
>>if var is Default:
>>  var = 1
>>return var * 2
>
> But yes, defining a sentinel like this is a good idea.

The problem is that a lot of built in and library functions
are not written this way. So when f is one of those, you
are stuck.

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Re: [IronPython] [ANN] IronPython Community Edition 1.0r2

[Miguel de Icaza]

Hello,

> And here's the license and the summary of applied patches:
> http://fepy.sourceforge.net/license.html
> http://fepy.sourceforge.net/patches.html

Do the patches include the various extensions that are being shipped?

Am wondering if you could distribute a IPCE that contains all the
documentation and sources, because it might be good for us to switch to
it from standard IronPython for our distribution purposes.

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py2app semi-standalone semi-works

[James Stroud]

Hello All,

I am trying to create a semi-standalone with the vendor python on OS X 
10.4 (python 2.3.5). I tried to include some packages with both 
--packages from the command and the 'packages' option in setup.py. While 
the packages were nicely included in the application bundle in both 
cases (at Contents/Resources/lib/python2.3/), they were not found by 
python when the program was launched, giving the error:

 "ImportError: No module named [whatever module]"

Is this because semi-standalone is semi-broken or is it because I have 
semi-omitted something?

Any advice on resolving this issue would be greatly appreciated and 
would greatly reduce the size of the download.

James
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Python crash when trying to generate an Excel worksheet with VBA macros

[dan_roman]

Hi,
I developed a script with a nice interface in Tkinter that allows me to
edit some formulas and to generate an Excel worksheet with VBA macros
within it. The script runs perfectlly in Office 2000, but in Office
2003 crash at line: "wbc = workbook.VBProject.VBComponents.Add(1)"
Please help me :-(

the code of the module that crash is (only in Excel 2003, in 2000 not):

import os
import string
from win32com.client import Dispatch, constants

str_code="""
Dim nrfunc As Integer
Dim cursor As Integer
Dim i As Integer
Dim j As Integer



Sub Fill()


'Aflu numaru de functii din XL
i = 1
..
"""
def createExcelReport(projectName,templateName,saveToPath):
# acquire application object, which may start application
application = Dispatch("Excel.Application")

# create new file ('Workbook' in Excel-vocabulary) using the specified
template
workbook = application.Workbooks.Add("Template1.xls")

# store default worksheet object so we can delete it later
defaultWorksheet = workbook.Worksheets(1)

worksheet1 = workbook.Worksheets(1)
worksheet2 = workbook.Worksheets(2)
worksheet3 = workbook.Worksheets(3)

>   wbc = workbook.VBProject.VBComponents.Add(1) -- here
is the problem

wbc.Name="Module1"

wbc.CodeModule.AddFromString(str_code)

path=saveToPath+"\\"+projectName+"_"+templateName+".xls"

workbook.SaveAs(path)

worksheet1 = workbook.Worksheets(1)

# make stuff visible now.
worksheet1.Activate()
application.Visible = True

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Re: What value should be passed to make a function use the default argument value?

[Georg Brandl]

Antoon Pardon wrote:
> On 2006-10-04, Paul Rubin  wrote:
>> Antoon Pardon <[EMAIL PROTECTED]> writes:
>>> Now in this case you could start by assigning arg the value 1 and
>>> eliminate the if test. However that only works if you know the
>>> default value for the argument. What he seems to be asking for
>>> is if there is an object, (let as call it Default), that would
>>> make code like:
>>> 
>>>   def f(var=1):
>>> 
>>> Equivallent to:
>>> 
>>>   def f(var=Default)
>>> if var is Default)
>>>   var = 1
>>
>> Oh, I see.  Yes, the OP should just use a distinct default value
>> instead of 1.  I usually do this with
>>
>>sentinel = object()
>>
>>def f(var=sentinel):
>>  if var is sentinel:
>># f was called without an arg 
> 
> But that can only work if you are the author of f. Take the
> following code:
> 
>   def myrepeat(obj, times = xxx):
> return itertools.repeat(obj, times)
> 
> What value do I have to substitue for xxx, so that myrepeat
> will have the exact same function as itertools.repeat?

There's no possible value. You'll have to write this like

def myrepeat(obj, times=None):
 if times is None:
 return itertools.repeat(obj)
 else:
 return itertools.repeat(obj, times)

Many functions implemented in C have this behavior.

For all functions written in Python, you can look up the default
value in the source.

Georg
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Re: string: __iter__()?

[mrquantum]

Am Wed, 04 Oct 2006 12:24:48 +0200 schrieb Peter Otten:

> 
> The older pre-__iter__() iteration style relying on __getitem__() still
> works:
> 
 class A:
> ... def __getitem__(self, index):
> ... return [3,2,1][index]
> ...
 for item in A():
> ... print item
> ...
> 3
> 2
> 1
> 

Thanks! I see:

>>> class B:
...   def __iter__(self):
... for i in xrange(3):
...   yield [3,2,1][i]
...
>>> myIter = B().__iter__()
>>> myIter.next()
3
>>> myIter.next()
2
>>> myIter.next()
1

Chris
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Re: What value should be passed to make a function use the defaultargument value?

[Fredrik Lundh]

Georg Brandl wrote:

>> But that can only work if you are the author of f. Take the
>> following code:
>>
>>   def myrepeat(obj, times = xxx):
>> return itertools.repeat(obj, times)
>>
>> What value do I have to substitue for xxx, so that myrepeat
>> will have the exact same function as itertools.repeat?
>
> There's no possible value. You'll have to write this like
>
> def myrepeat(obj, times=None):
> if times is None:
> return itertools.repeat(obj)
> else:
> return itertools.repeat(obj, times)

or:

def myrepeat(*args):
return itertools.repeat(*args)

 



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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-04, Georg Brandl <[EMAIL PROTECTED]> wrote:
> Antoon Pardon wrote:
>> On 2006-10-04, Paul Rubin  wrote:
>>> Antoon Pardon <[EMAIL PROTECTED]> writes:
 Now in this case you could start by assigning arg the value 1 and
 eliminate the if test. However that only works if you know the
 default value for the argument. What he seems to be asking for
 is if there is an object, (let as call it Default), that would
 make code like:
 
   def f(var=1):
 
 Equivallent to:
 
   def f(var=Default)
 if var is Default)
   var = 1
>>>
>>> Oh, I see.  Yes, the OP should just use a distinct default value
>>> instead of 1.  I usually do this with
>>>
>>>sentinel = object()
>>>
>>>def f(var=sentinel):
>>>  if var is sentinel:
>>># f was called without an arg 
>> 
>> But that can only work if you are the author of f. Take the
>> following code:
>> 
>>   def myrepeat(obj, times = xxx):
>> return itertools.repeat(obj, times)
>> 
>> What value do I have to substitue for xxx, so that myrepeat
>> will have the exact same function as itertools.repeat?
>
> There's no possible value. You'll have to write this like

Yes, that was the point I wanted to make. 

> def myrepeat(obj, times=None):
>  if times is None:
>  return itertools.repeat(obj)
>  else:
>  return itertools.repeat(obj, times)
>
> Many functions implemented in C have this behavior.

Which is a pity and IMO makes the documentation of these
functions a bit problematic. Take the itertool.repeat
documentation:

repeat(object[, times])
Make an iterator that returns object over and over again. Runs
indefinitely unless the times argument is specified. ...

My first impression from this, is that it is possible to call
this as follows:

  repeat(None, times = 5)

But that doesn't work either.

> For all functions written in Python, you can look up the default
> value in the source.

That wont help much if you would like something like the following:

   def fun(f):

 arg = Default
 try:
   arg = Try_Processing()
 except Nothing_To_Process:
   pass
 f(arg)

-- 
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Re: Resuming a program's execution after correcting error

[Sheldon]

MRAB wrote:
> Sheldon wrote:
> > MRAB wrote:
> > > Sheldon wrote:
> > > > Hi.
> > > >
> > > > Does anyone know if one can resume a python script at the error point
> > > > after the error is corrected?
> > > > I have a large program that take forever if I have to restart from
> > > > scratch everytime. The error was the data writing a file so it seemed
> > > > such a waste if all the data was lost and must be recalculated again.
> > > >
> > > You could modify the program while you're debugging it so that instead
> > > of, say:
> > >
> > > calculate data
> > > write data
> > >
> > > you have:
> > >
> > > if saved data exists:
> > > load data
> > > else:
> > > calculate data
> > > save data
> > > write data
> > >
> > > The pickle module would be useful here.
> > >
> > > Matthew
> >
> > I like your idea Matthew but I don't know how to pickle the many
> > variables in one file. Do I need to pickle each and every variable into
> > a seperate file?
> > var1,var2
> > pickle.dump(var1,f)
> > pickle.dump(var2,f2)
> >
> Using the 'pickle' module:
>
> # To store:
> f = open(file_path, "wb")
> pickle.dump(var1, f)
> pickle.dump(var2, f)
> f.close()
>
> # To load
> f = open(file_path, "rb")
> var1 = pickle.load(f)
> var2 = pickle.load(f)
> f.close()
>
> A more flexible alternative is to use the 'shelve' module. This behaves
> like a dict:
>
> # To store
> s = shelve.open(file_path)
> s["var1"] = "first"
> s["var2"] = [2, 3]
> s.close()
>
> # To load
> s = shelve.open(file_path)
> print s["var1"] # This prints "first"
> print s["var2"] # This prints [2, 3]
> s.close()
>
> Hope that helps
> Matthew

Perfect Matthew!

Much obliged!

/Sheldon

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Re: What value should be passed to make a function use the defaultargument value?

[Antoon Pardon]

On 2006-10-04, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> Georg Brandl wrote:
>
>>> But that can only work if you are the author of f. Take the
>>> following code:
>>>
>>>   def myrepeat(obj, times = xxx):
>>> return itertools.repeat(obj, times)
>>>
>>> What value do I have to substitue for xxx, so that myrepeat
>>> will have the exact same function as itertools.repeat?
>>
>> There's no possible value. You'll have to write this like
>>
>> def myrepeat(obj, times=None):
>> if times is None:
>> return itertools.repeat(obj)
>> else:
>> return itertools.repeat(obj, times)
>
> or:
>
> def myrepeat(*args):
> return itertools.repeat(*args)

Yes that works but I have the impression that this solution
becomes complicated very fast once you want to do extra
processing in the function body. Take the following

  def myrepeat(obj, times = xxx)"
newobj = Process(obj)
return itertools.repeat(obj, times)

I think it would become something like:

  def myrepeat(*args):
obj = args[0]
tail = args[1:]
newobj = Process(obj)
newargs = (newobj,) + tail
return itertools.repeat(*newargs)
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Re: Python/Tkinter crash.

[James Stroud]

Hendrik van Rooyen wrote:
> Hi,
> 
> I get the following:
> 
> [EMAIL PROTECTED]:~/Controller/lib> python display.py
> UpdateStringProc should not be invoked for type font
> Aborted
> 
> and I am back at the bash prompt - this is most frustrating, as there is no
> friendly traceback to help me guess where its coming from.
> 
> And what is worse, the script runs for a varying time before it simply exits
> like this.
> 
> What can I do to dig deeper to try to find a clue? - I don't even know if its
> Python, Tkinter or Linux...
> 
> Some background:
> 
> The application is a prototype gui for a controller of an injection moulding
> machine.
> It has two rows of five buttons across the top, and a canvas containing 
> various
> objects over the rest of the screen.
> Extensive use is made of configure to change the text of the buttons, as well 
> as
> their command bindings,
> to keep "the state of the system" current - its quite a hack at this time, as 
> I
> am still experimenting with getting the interface intuitive.
> On the canvas, there are multiple instances of a Meter class to show things 
> like
> temperatures and pressures,
> as well as a schematic representation of the machine, created out of polygons
> and lines.
> The schematic, as well as the Meters, are crudely animated by deleting and
> redrawing the objects repetitively with slightly different parameters in
> response to button presses. This is done by starting different threads to
> implement the various motions, which repetitively call kill and draw methods 
> in
> the main app, after which they (the threads) commit seppoku by returning.
> 
> Everything seems to work fine. - there is a thread that runs to move the meter
> values around continuously, and this has been stable for some time now, and I
> can get the various "machine" parts to move around the screen by pushing the
> buttons.
> The trouble occurs when I put the "machine" into Auto mode, simulating the
> various motions in a loop, - it runs for anything from a few tens to a few
> hundreds of cycles before handing in its dinner pail like this.
> 
> Any Ideas on what to do next to find the culprit?
> 
> - Hendrik
> 

Minimal source code to reproduce this error would help tremendously.
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Re: What value should be passed to make a function use the default argument value?

[Paul Rubin]

Antoon Pardon <[EMAIL PROTECTED]> writes:
> repeat(object[, times])
> Make an iterator that returns object over and over again. Runs
> indefinitely unless the times argument is specified. ...
> 
> My first impression from this, is that it is possible to call
> this as follows:
>   repeat(None, times = 5)
> But that doesn't work either.

The code and/or doc is wrong, you have to use a positional arg
and not a named one.  repeat(None, 5) does the right thing.

> That wont help much if you would like something like the following:
> 
>def fun(f):
> 
>  arg = Default
>  try:
>arg = Try_Processing()
>  except Nothing_To_Process:
>pass
>  f(arg)

Write it like this:

def fun(f):
  args = ()
  try:
args = (Try_Processing(),)
  except Nothing_To_Process:
pass
  f(*args)
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Re: What value should be passed to make a function use the defaultargument value?

[Paul Rubin]

Antoon Pardon <[EMAIL PROTECTED]> writes:
> I think it would become something like:
> 
>   def myrepeat(*args):
> obj = args[0]
> tail = args[1:]
> newobj = Process(obj)
> newargs = (newobj,) + tail
> return itertools.repeat(*newargs)

Too messy.  Just write:

  def myrepeat(obj, *times):
return itertools.repeat(Process(obj), *times)
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Re: Python to use a non open source bug tracker?

[Ramon Diaz-Uriarte]

On 10/4/06, Richard Jones <[EMAIL PROTECTED]> wrote:
> Nick Craig-Wood wrote:
> > [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >>  And i dunno what the case against Trac is (it looks a fine tool for my
> >>  small projects) but probably it's not good enough for python.org
> >
> > Trac is really good in my experience.
>
> Trac was considered.
>
>
> > A nice extra is that it is written in python.
>
> So are Roundup and Launchpad, two of the other three trackers considered.
>

So, just out of curiosity, what were the pros/cons of Launchpad,
specially compared to Roundup?


R.


>
> Richard
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Ramon Diaz-Uriarte
Bioinformatics Unit
Spanish National Cancer Centre (CNIO)
http://ligarto.org/rdiaz
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replacing all 'rng's in a buffer with consecutive r[1], r[2]'s

[m g william]

I read a file into a buffer and subject it to re.sub()
I can replace every occurrence of a pattern with a fixed string but when
I try to replace each occurrence with a string that changes (by having
an incrementing number in it, (ie 'repTxt[1]','repTxt[2]'etc), I note
that the incrementing number generator function, I'm calling in
re.sub(), (which works fine outside it), seems to be evaluated only once
and is therefore not incrementing the number.

Can someone please show me a working eg of how to replace 'rng' in a
file with 'r[1]', 'r[2]' etc. This is my first Python program so any
help would be very gratefully received.

Here's my code

[CODE]
#read orig file into buf & close file
import re
infile = file('pyInfile', 'r')
buf = infile.read()
infile.close()
print buf

#replace all allocated streams with 'rng'
print '=== orig buf '; print buf
pat = re.compile('r\[\d+\]')
buf = pat.sub("rng", buf, 0)

#now replace all 'rng's with consecutive streams
#===
def static_num():
''' this is a generator function that avoids globals
yield differentiates fn as generator fn which freezes
'''
x = 0
while True:
   x += 1
   yield str(x)

static = static_num().next

pat = re.compile('rng')
#there is a problem in that static only seems to get called once.
#need to invoke this every time you get a match for it to
#increment
buf = pat.subn('rng[' + static() + ']', buf, 0)
print 'static() incrementing ok ' + static()
print 'static() incrementing ok ' + static()
print '=== changed to '; print buf[0] 
#outfile = file('pyOutfile', 'w')
#outfile.write(buf)
[/CODE]


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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-03, LaundroMat <[EMAIL PROTECTED]> wrote:
> Suppose I have this function:
>
> def f(var=1):
> return var*2
>
> What value do I have to pass to f() if I want it to evaluate var to 1?
> I know that f() will return 2, but what if I absolutely want to pass a
> value to f()? "None" doesn't seem to work..
>
> Thanks in advance.
>

I think the only general solution for your problem would be to
define a defaulter function. Something like the following:

  Default = object()

  def defaulter(f, *args):

while args:
  if args[-1] is Default:
args = args[:-1]
  else:
break
return f(*args)


The call:

  defaulter(f, arg1, arg2, Default, ..., Default)

would then be equivallent to:

  f(arg1, arg2)

Or in your case you would call:

  defaulter(f, Default)

-- 
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Tk: filling a frame with a widget

[Paolo Pantaleo]

I have this code

from Tkinter import *

root=Tk()
Button(root).pack(fill=BOTH)
root.mainloop()

I would expect the button filling all the client draw area of the
Frame, but when I resize the root window the button becomes wider, but
not higher ( I get some empty space under the button). How could set
the button to fill always all the space available?

Well maybe some other solution exists, since my problem is this:

I have a resizable window and i want to keep it filled with a Canvas
displaying an image (PhotoImage). Can I get the in some way the size
of the clien draw area of the window containig the canvas?

Thnx
PAolo

-- 
if you have a minute to spend please visit my photogrphy site:
http://mypic.co.nr
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SOAPpy

[Jonathan Morgan]

Hi,

I'm just started playing around with Python to trigger a method in a web 
service.  I've been using SOAPpy and it's incredibly badly documented so i'm 
not getting very far.

What I need to do is create the following in my SOAP body:

http://www.csapi.org/schema/etc...";>
http://www.csapi.org/schema/etc...";>MyAddress


I've managed to kinda do something similar to this with the following piece of 
code:

from SOAPpy import SOAPProxy

wsdlurl = 'http://192.168.30.91:6062/mywebservice'

# define the namespace 
namespace = 'http://www.csapi.org/schema/etc...'

server = SOAPProxy(wsdlurl) 

print 'Test: ' + server._ns(namespace).myMethod(address = "MyAddress")

This creates the following SOAP XML:

http://www.csapi.org/schema/etc..."; 
SOAP-ENC:root="1">
MyAddress


I need to be able to add a namespace to the address parameter so it matches the 
previous SOAP XML above (n1:address, xmlns, etc.) and, what with Python being 
new to me and SOAPpy having awful docs, I can't figure out how to do this. 

Could anyone please help here?

Cheers,

Jon.








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Re: Python to use a non open source bug tracker?

[Steve Holden]

Giovanni Bajo wrote:
> A.M. Kuchling wrote:
> 
> 
>>>... using a non open source tracker (called JIRA - never heard
>>>before of course) for Python itself.
>>
>>Other projects do use it; see
>> for a partial list, and a
>>link to the Apache Software Foundation's issue trackers.
> 
> 
> which, in my humble opinion, is just a list of other examples of projects 
> which
> are misguided. People seem to have no idea when a company is sold, when a CEO
> is changed, or something like that. Hhistory's repeating, but hackers are not
> learning.
> 
> 
>>>Does this smell "Bitkeeper fiasco" to anyone else than me?
>>
>>The committee did expect this recommendation to be controversial.  :)
> 
> 
> I guess :)
> 
> In fact, I have a deepest hope that this recommendation was just a fake just 
> to
> get people setup a roundup installation...

But sadly people are much happier complaining on c.l.py than exerting 
themselves to support the community with an open source issue tracker. 
Hello, Jira 

regards
  Steve
-- 
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Skype: holdenweb   http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

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Re: Python to use a non open source bug tracker?

[Paul Boddie]

Richard Jones wrote:
> Nick Craig-Wood wrote:
> >
> > Trac is really good in my experience.
>
> Trac was considered.
>
> > A nice extra is that it is written in python.
>
> So are Roundup and Launchpad, two of the other three trackers considered.

It should be noted that most skepticism (that I'm aware of) about
Launchpad is typically rooted in that service's closed source nature.
People voicing such skepticism don't seem to cut it any slack just
because it is apparently written in Python.

Paul

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Re: Roundup Issue Tracker release 1.1.3

[Steve Holden]

[EMAIL PROTECTED] wrote:
> Richard Jones wrote:
> 
>>I'm proud to release version 1.1.3 of Roundup.
>>five database back-ends (anydbm, sqlite, metakit,
>>mysql and postgresql).
> 
> 
> That ORM is pretty impressive:
> http://roundup.sourceforge.net/doc-1.0/design.html#roundup-database
> 
> I like how easy it is to specify m-to-n relations.
> 
> Is it possible to have a table with a multi-column primary key?
> 
Of course you could redesign your database so the primary keys are all 
IDs, and the former keys become simple columns with a UNIQUE index 
covering them ...

regards
  Steve
-- 
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Skype: holdenweb   http://holdenweb.blogspot.com
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Where to I find files: gtk.py _gtk.py and GDK.py

[vedran_dekovic]

Hello,
Can you tell me where to I find exactly this files:gtk.py, _gtk.py and
GDK.py
I was look everywhere,and download package of gtk but I can't find this
files







THANKS

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Re: Python/Tkinter crash.

[Hendrik van Rooyen]

Not talking to myself - Added results of strace run at bottom

"Hendrik van Rooyen" <[EMAIL PROTECTED]> wrote:

> Hi,
>
> I get the following:
>
> [EMAIL PROTECTED]:~/Controller/lib> python display.py
> UpdateStringProc should not be invoked for type font
> Aborted
>
> and I am back at the bash prompt - this is most frustrating, as there is no
> friendly traceback to help me guess where its coming from.
>
> And what is worse, the script runs for a varying time before it simply exits
> like this.
>
> What can I do to dig deeper to try to find a clue? - I don't even know if its
> Python, Tkinter or Linux...
>
> Some background:
>
> The application is a prototype gui for a controller of an injection moulding
> machine.
> It has two rows of five buttons across the top, and a canvas containing
various
> objects over the rest of the screen.
> Extensive use is made of configure to change the text of the buttons, as well
as
> their command bindings,
> to keep "the state of the system" current - its quite a hack at this time, as
I
> am still experimenting with getting the interface intuitive.
> On the canvas, there are multiple instances of a Meter class to show things
like
> temperatures and pressures,
> as well as a schematic representation of the machine, created out of polygons
> and lines.
> The schematic, as well as the Meters, are crudely animated by deleting and
> redrawing the objects repetitively with slightly different parameters in
> response to button presses. This is done by starting different threads to
> implement the various motions, which repetitively call kill and draw methods
in
> the main app, after which they (the threads) commit seppoku by returning.
>
> Everything seems to work fine. - there is a thread that runs to move the meter
> values around continuously, and this has been stable for some time now, and I
> can get the various "machine" parts to move around the screen by pushing the
> buttons.
> The trouble occurs when I put the "machine" into Auto mode, simulating the
> various motions in a loop, - it runs for anything from a few tens to a few
> hundreds of cycles before handing in its dinner pail like this.
>
> Any Ideas on what to do next to find the culprit?
>
> - Hendrik

Ran it with strace - here is last bit of log:

write(3, "<\30\2\0\35\0\300\2<\0\2\0\34\0\300\0027\0\7\0\34\0\300"..., 68) = 68
select(4, [3], [], [], {0, 0})  = 0 (Timeout)
gettimeofday({1159960306, 369206}, {4294967176, 0}) = 0
futex(0x807b908, FUTEX_WAKE, 1) = 0
futex(0x80bad48, FUTEX_WAKE, 1) = 0
write(3, "5\30\4\0N\0\300\2 \0\300\2r\2\220\0F\0\5\0N\0\300\2\23"..., 900) = 900
gettimeofday({1159960306, 371171}, {4294967176, 0}) = 0
select(4, [3], [], [], {0, 0})  = 0 (Timeout)
gettimeofday({1159960306, 371386}, {4294967176, 0}) = 0
futex(0x807b908, FUTEX_WAKE, 1) = 0
select(0, NULL, NULL, NULL, {0, 2}) = 0 (Timeout)
futex(0x80bad48, FUTEX_WAIT, 0, NULL)   = 0
futex(0x80bad48, FUTEX_WAKE, 1) = 0
write(3, "<\30\2\0\34\0\300\2<\0\2\0\35\0\300\0027\0\7\0\35\0\300"..., 68) = 68
select(4, [3], [], [], {0, 0})  = 0 (Timeout)
gettimeofday({1159960306, 396232}, {4294967176, 0}) = 0
futex(0x807b908, FUTEX_WAKE, 1) = 0
futex(0x80bad48, FUTEX_WAKE, 1) = 0
write(3, "5\30\4\0N\0\300\2 \0\300\2r\2\220\0F\0\5\0N\0\300\2\23"..., 900) = 900
gettimeofday({1159960306, 398381}, {4294967176, 0}) = 0
select(4, [3], [], [], {0, 0})  = 0 (Timeout)
gettimeofday({1159960306, 398597}, {4294967176, 0}) = 0
futex(0x807b908, FUTEX_WAKE, 1) = 0
select(0, NULL, NULL, NULL, {0, 2}) = 0 (Timeout)
futex(0x80bad48, FUTEX_WAIT, 0, NULL)   = 0
futex(0x80bad48, FUTEX_WAKE, 1) = 0
futex(0x807b908, FUTEX_WAIT, 0, NULL)   = 0
write(3, "7\30\5\0\21\0\300\2:\0\300\2\4\0\0\0\377\0\0\0", 20) = 20
select(4, [3], [], [], {0, 0})  = 0 (Timeout)
gettimeofday({1159960306, 420182}, {4294967176, 0}) = 0
futex(0x807b908, FUTEX_WAKE, 1) = 0
futex(0x80bad48, FUTEX_WAIT, 0, NULL)   = 0
futex(0x80bad48, FUTEX_WAKE, 1) = 0
write(3, "5\30\4\0N\0\300\0029\0\300\2\207\0\210\0F\0\5\0N\0\300"..., 708) = 708
gettimeofday({1159960306, 421944}, {4294967176, 0}) = 0
select(4, [3], [], [], {0, 0})  = 0 (Timeout)
gettimeofday({1159960306, 422168}, {4294967176, 0}) = 0
futex(0x807b908, FUTEX_WAKE, 1) = 0
select(0, NULL, NULL, NULL, {0, 2}) = ? ERESTARTNOHAND (To be restarted)
+++ killed by SIGABRT +++




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Re: Python to use a non open source bug tracker?

[Fredrik Lundh]

Steve Holden wrote:

> But sadly people are much happier complaining on c.l.py than exerting
> themselves to support the community with an open source issue tracker.

you're not on the infrastructure list, I hear.  python.org could still need a
few more roundup volunteers, but it's not like nobody's prepared to con-
tribute manhours.  don't underestimate the community.

 



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Re: What value should be passed to make a function use the default argument value?

[Antoon Pardon]

On 2006-10-04, Antoon Pardon <[EMAIL PROTECTED]> wrote:
> On 2006-10-03, LaundroMat <[EMAIL PROTECTED]> wrote:
>> Suppose I have this function:
>>
>> def f(var=1):
>> return var*2
>>
>> What value do I have to pass to f() if I want it to evaluate var to 1?
>> I know that f() will return 2, but what if I absolutely want to pass a
>> value to f()? "None" doesn't seem to work..
>>
>> Thanks in advance.
>>
>
> I think the only general solution for your problem would be to
> define a defaulter function. Something like the following:
>
>   Default = object()
>
>   def defaulter(f, *args):
>
> while args:
>   if args[-1] is Default:
> args = args[:-1]
>   else:
> break
> return f(*args)
>
>
> The call:
>
>   defaulter(f, arg1, arg2, Default, ..., Default)
>
> would then be equivallent to:
>
>   f(arg1, arg2)
>
> Or in your case you would call:
>
>   defaulter(f, Default)

A little update, with the functools in python 2.5 you
could turn the above into a decorator. Something like
the following (not tested):

  def defaulting(f):
return functools.partial(defaulter, f)

You could then simply write:

  @defaulting
  def f(var=1):
return var * 2

And for built in or library functions something like:

  from itertools import repeat
  repeat = defaulting(repeat)

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Re: Where to I find files: gtk.py _gtk.py and GDK.py

[John Machin]

[EMAIL PROTECTED] wrote:
> Hello,
> Can you tell me where to I find exactly this files:gtk.py, _gtk.py and
> GDK.py
> I was look everywhere,and download package of gtk but I can't find this
> files
>

I would like to know what your definition of "everywhere" is.
Google("python gtk") gives this as the first hit:
http://www.pygtk.org/

How much would you like to bet, and at what odds, that that which you
seek is not there?

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Re: filling a frame with a widget

[Fredrik Lundh]

Paolo Pantaleo wrote:

>I have this code
>
> from Tkinter import *
>
> root=Tk()
> Button(root).pack(fill=BOTH)
> root.mainloop()
>
> I would expect the button filling all the client draw area of the
> Frame, but when I resize the root window the button becomes wider, but
> not higher ( I get some empty space under the button).

pack(fill=BOTH, expand=1) should do the trick.

the pack geometry manager works by slicing off vertical or horizontal areas from
the parent, one area per widget.  the "fill" option controls how to place the 
widget
inside that area, the "expand" option controls how to handle any extra space 
left
in the parent.  if "expand" isn't set for any child widget, the extra space is 
left un-
used.

 



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Re: string: __iter__()?

[Michele Simionato]

mrquantum wrote:
> Hello!
>
> Just for curiosity i'd like to know why strings don't support the
> iteration protocoll!? Is there some deeper reason for this?
>
> >>> hasattr('SomeString', '__iter__')
> False
>
> In Python 2.5 it's actually simple to obtain one:
>
> >>> myIter = (c for c in 'SomeString')
> >>> myIter.next()
> 'S'
>
> Thanks for info!
>
> Chris

Well, I see it as a feature. Typically I want to consider a string as
an atomic object (and
not as a sequence of characters) and I can check hasattr(obj,
'__iter__') to distinguish
(for instance) a list of strings from a single string (typically in
recursive algorithms
working on texts).

  Michele Simionato

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Re: replacing all 'rng's in a buffer with consecutive r[1], r[2]'s

[Peter Otten]

m g william wrote:

> I read a file into a buffer and subject it to re.sub()
> I can replace every occurrence of a pattern with a fixed string but when
> I try to replace each occurrence with a string that changes (by having
> an incrementing number in it, (ie 'repTxt[1]','repTxt[2]'etc), I note
> that the incrementing number generator function, I'm calling in
> re.sub(), (which works fine outside it), seems to be evaluated only once
> and is therefore not incrementing the number.
> 
> Can someone please show me a working eg of how to replace 'rng' in a
> file with 'r[1]', 'r[2]' etc. This is my first Python program so any
> help would be very gratefully received.
> 
> buf = pat.subn('rng[' + static() + ']', buf, 0)

You'll have to repeat that to get the desired effect:

pat = re.compile("rng")
replacements = 1
while replacements:
buf, replacements = pat.subn("r[" + static() + "]", buf, 1)
print buf

but there is a more efficient alternative

def fsub(match):
return "r[" + static() + "]"
buf = re.sub("rng", fsub, buf)

that would still work if you were to replace 'rng' with 'rng[1]',
'rng[2]'...

Peter
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Re: Getting Pygopherd to work under Mac OS X

[Cameron Kaiser]

[EMAIL PROTECTED] writes:

>Could someone *please* show us poor Mac users how to install and run
>Pygopherd successfully under Mac OS X? The latest version 2.0.4, as
>found at http://freshmeat.net/projects/pygopherd/ is my bane. I think I
>talked to John Goerzen, the maintainer, a while back but nothing came
>of it.
>I've tried this twice now, following the instructions given and have
>found nothing but grief and many errors.
>For a Python app it seems to be rather platform dependant! Does
>Pygopherd need to be altered somehow to work under OS X?
>If Pygopherd is a lost cause, can someone recommend another
>*maintained* gopher daemon with instructions that would allow its' use
>under OS X?

Can you be more specific about what doesn't work? I'm not sure what you
mean by platform dependent in this case.

--
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personal page: http://www.armory.com/%7Espectre/
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Re: Python to use a non open source bug tracker?

[A.M. Kuchling]

On Wed, 04 Oct 2006 07:37:47 GMT, 
Giovanni Bajo <[EMAIL PROTECTED]> wrote:
> I am seriously concerned
> that the PSF infrastructure committee EVER considered non open-source
> applications for this. In fact, I thought that was an implicit requirement in
> the selection.

Being open source wasn't a requirement; minimal requirements were
specified in the initial message requesting trackers
(http://wiki.python.org/moin/OriginalCallForTrackers).

--amk
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Re: Instantiating an object when the type is only known at runtime

[Carsten Haese]

On Tue, 2006-10-03 at 18:19, Samuel wrote:
> Thanks, that's what I was looking for.
> 
> > >>> m = __import__( "StringIO" )
> > >>> x = getattr( m, "StringIO" )()
> > >>> x
> > 
> > >>>
> 
> For the records: If the module is already loaded, this also works:
> 
> if my_type_is_not_yet_loaded:
> module = __import__(type)
> obj= getattr(module, type)
> else:
> obj= globals().get(type)
> resource = obj(my_arg1, my_arg2)

You seem to be under the impression that importing an already imported
module is a hideously expensive operation that must be avoided at all
costs. It's not. If you import an already imported module, python simply
returns the module object from sys.modules without executing any of the
module's code.

Your code will be much easier to read if you eliminate the
"my_type_is_not_yet_loaded" check, whatever that may be under the hood,
and always perform the __import__. It's also likely to be at least as
fast, but I couldn't run a timing comparison even if I wanted to because
you didn't post working code.

-Carsten


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Re: replacing all 'rng's in a buffer with consecutive r[1], r[2]'s

[Paul McGuire]

"m g william" <[EMAIL PROTECTED]> wrote in message 
news:[EMAIL PROTECTED]

> #now replace all 'rng's with consecutive streams
> #===
> def static_num():
>''' this is a generator function that avoids globals
> yield differentiates fn as generator fn which freezes
> '''
>x = 0
>while True:
>   x += 1
>   yield str(x)
>
> static = static_num().next

Also, check out itertools.count (one of many tools from the excellent 
itertools module), as in:

static - itertools.count().next

- no need to roll this function for yourself.  You still need to call it for 
each substitution, though, as described elsewhere.

-- Paul 


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Re: Python to use a non open source bug tracker?

[Giovanni Bajo]

A.M. Kuchling wrote:

>> I am seriously concerned
>> that the PSF infrastructure committee EVER considered non open-source
>> applications for this. In fact, I thought that was an implicit
>> requirement in the selection.
>
> Being open source wasn't a requirement;

which is, indeed, shocking and amazing.

> minimal requirements were
> specified in the initial message requesting trackers
> (http://wiki.python.org/moin/OriginalCallForTrackers).

Where does it mention that only trackers which have at least an existing
installation and a group of people for maintenance will be considered? It
could easily be assumed that PSF had already enough bandwidth, server,
manpower to handle any bugtracker installation.

In fact, are you absolutely positive that you need so much effort to
maintain an existing bugtracker installation? I know for sure that GCC's
Bugzilla installation is pretty much on its own; Daniel Berlin does some
maintainance every once in a while (upgrading when new versions are out,
applying or writing some patches for most requested features in the
community, or sutff like that), but it's surely not his job, not even
part-time.
-- 
Giovanni Bajo


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dictionary of list from a file

[andrea . spitaleri]

Hi guys,
this is my first post. my "programming" background is perlish scripting
and now I am learning python. I need to create a dictionary of list
from a file. Normally in perl I use to do like:

while(){
  @info=split(/ +/,$_);
  push (@{$tmp{$info[0]}},$info[1]);
}

and then
foreach $key (keys %tmp){
   print "$key -> @{$tmp{$key}}\n";
}
i get

2 -> 1  2 3 4
7 -> 7 8 9 10

in python I tried:
b={}
a=[]
for line in fl.readlines():
 info=lines.split()
 b[info[0]] = a.append(info[1])

and then
for i in b:
 print i,b[i]
i get
2 None
7 None

data file is:
2 1
2 2
2 3
2 4
7 7
7 8
7 9
7 10

Any help?? 
Thanks in advance
Best Regards

Andrea

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Re: dictionary of list from a file

[limodou]

On 4 Oct 2006 06:09:21 -0700, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
> Hi guys,
> this is my first post. my "programming" background is perlish scripting
> and now I am learning python. I need to create a dictionary of list
> from a file. Normally in perl I use to do like:
>
> while(){
>   @info=split(/ +/,$_);
>   push (@{$tmp{$info[0]}},$info[1]);
> }
>
> and then
> foreach $key (keys %tmp){
>print "$key -> @{$tmp{$key}}\n";
> }
> i get
>
> 2 -> 1  2 3 4
> 7 -> 7 8 9 10
>
> in python I tried:
> b={}
> a=[]
> for line in fl.readlines():
>  info=lines.split()
>  b[info[0]] = a.append(info[1])
>
> and then
> for i in b:
>  print i,b[i]
> i get
> 2 None
> 7 None
>
> data file is:
> 2 1
> 2 2
> 2 3
> 2 4
> 7 7
> 7 8
> 7 9
> 7 10
>
> Any help??
> Thanks in advance
> Best Regards
>
> Andrea
>
here is my program

d = {}
for line in file('test.txt'):
line = line.strip()
if line:
k, v = line.strip().split()
d.setdefault(k, []).append(v)
print d

Dict in Python has a setdefault method, if there is a key in dict,
it'll return the value, and if there is not a key existed, it'll
insert a key with the value supplied by the second parameter and
return the value. So using setdefault will be very handy for inserting
key.

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Re: Python to use a non open source bug tracker?

[Paul Boddie]

Giovanni Bajo wrote:
>
> In fact, are you absolutely positive that you need so much effort to
> maintain an existing bugtracker installation?

I wonder what kinds of insights were sought from other open source
projects. It's not as if there aren't any big open source projects
having approachable community members willing to share their thoughts
on running open source (or any other kind of) issue tracking software.
KDE and GNOME don't use SourceForge and yet manage their own
infrastructure - has anyone asked them how they do it?

Paul

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Re: Python to use a non open source bug tracker?

[Steve Holden]

Fredrik Lundh wrote:
> Steve Holden wrote:
> 
> 
>>But sadly people are much happier complaining on c.l.py than exerting
>>themselves to support the community with an open source issue tracker.
> 
> 
> you're not on the infrastructure list, I hear.  python.org could still need a
> few more roundup volunteers, but it's not like nobody's prepared to con-
> tribute manhours.  don't underestimate the community.
> 
No, I'm not on the infrastructure list, but I know that capable people 
*are*: and you know I am quite capable of donating my time to the cause, 
when I have it to spare (and sometimes even when I don't).

Perhaps what I *should* have written was "Sadly *many* people spend too 
much time bitching and moaning about those that roll their sleeves up, 
and not enough rolling their own sleeves up and pitching in".

Sniping from the sidelines is far easier than hard work towards a goal.

Kindly note that none of the above remarks apply to you.

regards
  Steve
-- 
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Skype: holdenweb   http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

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Re: dictionary of list from a file

[keirr]

[EMAIL PROTECTED] wrote:

> in python I tried:
> b={}
> a=[]
> for line in fl.readlines():
>  info=lines.split()
>  b[info[0]] = a.append(info[1])
>
> and then
> for i in b:
>  print i,b[i]
> i get
> 2 None
> 7 None
>
> data file is:
> 2 1
> 2 2
> 2 3
> 2 4
> 7 7
> 7 8
> 7 9
> 7 10
>
> Any help??
Andrea,
 first the append method returns None, as you have discovered; it makes
an inplace update (to a in your example) but does not return the list
it has updated.   This has surprised a few people in the past :-)
Here is what I've used before for updating lists values in a
dictionary.

d[key] = d.get(key, []) + [value]

where d is a dict(ionary)

Hope this helps.

 Keir.

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Access to static members from inside a method decorator?

[glen . coates . bigworld]

I'm developing a library at the moment that involves many classes, some
of which have "exposed" capabilities.  I'm trying to design a nice
interface for both exposing those capabilities, and inspecting
instances to find out what capabilities they have.

At the moment, I'm leaning towards a superclass (Exposed) that defines
a static method which is a decorator (expose) such that any derived
class can mark a method with @Exposed.expose and it will then be later
returned by getExposedMethods(), a la:

class Exposed:
  @staticmethod
  def expose( f ):
...

  def getExposedMethods( self ):
...

class Person( Exposed ):
  @Exposed.expose
  def talk( self, ... ):
...

I'm trying to implement the decorator by having it populate a static
member list of whatever class it's in with a reference to the method.
getExposedMethods() would then return the contents of each of those
lists from itself back to Exposed in the class hierarchy.  The first
problem was that having a reference to the method (i.e. talk()) does
not allow you to get a reference to the enclosing class (I had hoped
im_class would lead me there).  The real hiccup was that explicitly
passing the class as an argument to the decorator generates a undefined
global name error, presumably because at that point of execution the
class object hasn't been fully created/initialised.

So how can this be done?  It doesn't seem like it's possible to pass a
reference to the enclosing class into the decorator, which in turn
means that static tracking of the list of exposed methods is impossible
(at least, if I want to use decorators).

Any ideas that will enable my initial design, or suggestions for an
elegant, workable alternative would be much appreciated.

Cheers,
Glen

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Re: dictionary of list from a file

[Thomas Jollans]

On Wed, 04 Oct 2006 06:09:21 -0700, [EMAIL PROTECTED] let this
slip:

> b={}
> a=[]
> for line in fl.readlines():
>  info=lines.split()
>  b[info[0]] = a.append(info[1])
append does not return a value. you'll want something like
  d = {}
  for line in fl:
key, value = line.strip().split()
if key not in d: d[key] = []
d[key].append(value)

or something with setdefault, as limodou suggested.
 
> for i in b:
>  print i,b[i]
you can also use:
  for k,v in d.iteritems():
print k,v

if you're dealing with integers only, you'll want to convert the data when
reading using int() and long().

> i get
> 2 None
> 7 None
> 
> data file is:
> 2 1
> 2 2
> 2 3
> 2 4
> 7 7
> 7 8
> 7 9
> 7 10

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sax barfs on unicode filenames

[Edward K. Ream]

Hi.  Presumably this is a easy question, but anyone who understands the sax 
docs thinks completely differently than I do :-)



Following the usual cookbook examples, my app parses an open file as 
follows::



parser = xml.sax.make_parser()

parser.setFeature(xml.sax.handler.feature_external_ges,1)

# Hopefully the content handler can figure out the encoding from the  
element.

handler = saxContentHandler(c,inputFileName,silent)

parser.setContentHandler(handler)

parser.parse(theFile)



Here 'theFile' is an open file.  Usually this works just fine, but when the 
filename contains u'\u8116' I get the following exception:



Traceback (most recent call last):



  File "c:\prog\tigris-cvs\leo\src\leoFileCommands.py", line 2159, in 
parse_leo_file

parser.parse(theFile)



  File "c:\python25\lib\xml\sax\expatreader.py", line 107, in parse

xmlreader.IncrementalParser.parse(self, source)



  File "c:\python25\lib\xml\sax\xmlreader.py", line 119, in parse

self.prepareParser(source)



  File "c:\python25\lib\xml\sax\expatreader.py", line 111, in prepareParser

self._parser.SetBase(source.getSystemId())



UnicodeEncodeError: 'ascii' codec can't encode character u'\u8116' in 
position 44: ordinal not in range(128)



Presumably the documentation at:



http://docs.python.org/lib/module-xml.sax.xmlreader.html



would be sufficient for a sax-head, but I have absolutely no idea of how to 
create an InputSource that can handle non-ascii filenames.



Any help would be appreciated.  Thanks!



Edward

Edward K. Ream   email:  [EMAIL PROTECTED]
Leo: http://webpages.charter.net/edreamleo/front.html



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Re: Where to I find files: gtk.py _gtk.py and GDK.py

[Thomas Jollans]

On Wed, 04 Oct 2006 05:17:48 -0700, [EMAIL PROTECTED] let this
slip:

> Hello,
> Can you tell me where to I find exactly this files:gtk.py, _gtk.py and
> GDK.py
> I was look everywhere,and download package of gtk but I can't find this
> files

on my system, the gtk module is at
/usr/lib/python2.4/site-packages/gtk-2.0/gtk/__init__.pyc . On your
system, __import__('gtk').__file__ knows more than you.

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How to ask sax for the file encoding

[Edward K. Ream]

Following the usual cookbook examples, my app parses an open file as 
follows::



parser = xml.sax.make_parser()

parser.setFeature(xml.sax.handler.feature_external_ges,1)

# Hopefully the content handler can figure out the encoding from the  
element.

handler = saxContentHandler(c,inputFileName,silent)

parser.setContentHandler(handler)

parser.parse(theFile)



Can anyone tell me how the content handler can determine the encoding of the 
file?  Can sax provide this info?



Thanks!



Edward

Edward K. Ream   email:  [EMAIL PROTECTED]
Leo: http://webpages.charter.net/edreamleo/front.html




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Re: Python to use a non open source bug tracker?

[Valentino Volonghi aka Dialtone]

Terry Reedy <[EMAIL PROTECTED]> wrote:

> As I understood B.C.'s announcement, that was one of the judging criteria,
> and the plan is for PSF to get a daily backup dump of the data.

This had nothing to do with the choice of not using Trac or Launchpad.

Quoting Brett Cannon from the original mail:
""
As for Trac and Launchpad, both had fundamental issues that led to them
not being chosen in the end.  Most of the considerations had to do with
customization or UI problems.
""

So clearly the 'get a daily backup of the data' is not the reason.
Backing up a sqlite database is pretty easy.

-- 
Valentino Volonghi aka Dialtone
Now Running MacOSX 10.4
Blog: http://vvolonghi.blogspot.com
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