from:"Andre"

Hi all.

Is there a way to load a module given a full path to the module
without extending sys.path first?

Andre'

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Re: Stack trace in C

Jean-Paul Calderone <[EMAIL PROTECTED]> wrote:
> On Tue, 25 Jul 2006 14:20:41 +0200, Andre Poenitz <[EMAIL PROTECTED]> wrote:
>>
>>
>>Bear with me - I am new to Python. (And redirect me to a more suitable
>>newsgroup in case this one is not appropriate.)
>>
>>I am trying to embed Python into a C++ application and want to get back
>>a backtrace in case of errors in the python code.
> 
> I think you'd have more luck with the traceback module, which has such
> methods as format_exception and print_tb.

That's where I got my 'inspiration' from.

Unfortunately my attempt to translate this into C failed, and I can't
see the reason.

Thanks for the hint nevertheless

Andre'
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Re: Stack trace in C

Just <[EMAIL PROTECTED]> wrote:
> 
>> On Tue, 25 Jul 2006 14:20:41 +0200, Andre Poenitz  wrote:
>> >
>> >
>> >Bear with me - I am new to Python. (And redirect me to a more suitable
>> >newsgroup in case this one is not appropriate.)
>> >
>> >I am trying to embed Python into a C++ application and want to get back
>> >a backtrace in case of errors in the python code.
>> 
>> I think you'd have more luck with the traceback module, which has such
>> methods as format_exception and print_tb.
> 
> From C, PyErr_Print() is often handy (if only for debugging).

I'd like to display the backtrace i a fancy gui widget, and PyErr_Print
sends everything to stderr...

Andre'
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Re: Loading module via full path

Andre Poenitz <[EMAIL PROTECTED]> wrote:
> Hi all.
> 
> Is there a way to load a module given a full path to the module
> without extending sys.path first?

Ok. imp.find_module() and imp.load_module() seem to do what I need.

Andre'
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Re: Loading module via full path

2006-08-22 Thread Andre Poenitz

Gary Herron <[EMAIL PROTECTED]> wrote:
> Andre Poenitz wrote:
>> Hi all.
>>
>> Is there a way to load a module given a full path to the module
>> without extending sys.path first?
>
> The standard module named "imp" can help you with this.

Thank you. I got stuck on http://docs.python.org/api/importing.html
(as I need it to be called from C(++)) and found no way to specify a path there
[and there aren't too many cross references in the python docs *sigh*]

I have now something similar to

class CPyObject
{
public:
  explicit CPyObject(PyObject * pObject) : m_pObject(pObject) { /*Check();*/ }
  ~CPyObject() { Py_XDECREF(m_pObject); }
  operator PyObject *() { return m_pObject; }
private:
  CPyObject(const CPyObject &);  // intentionally not implemented
  void operator=(const CPyObject &); // intentionally not implemented
  PyObject * m_pObject;
};

static PyObject * LoadModule(const char * mod, const char * path)
{
  CPyObject pyImpModule ( PyImport_Import(PyString_FromString("imp")) ); 

  CPyObject pyImpFindModuleFunc ( PyObject_GetAttrString(pyImpModule, 
"find_module") ); 
  CPyObject pyImpFindModuleArgs ( Py_BuildValue("s[s]", mod, path) );
  CPyObject pyImpFindModuleRes  ( PyObject_CallObject(pyImpFindModuleFunc, 
pyImpFindModuleArgs) ); 

  CPyObject pyImpLoadModuleFunc ( PyObject_GetAttrString(pyImpModule, 
"load_module") ); 
  CPyObject pyImpLoadModuleArgs ( Py_BuildValue("sOOO",
mod,
PyTuple_GetItem(pyImpFindModuleRes, 0),
PyTuple_GetItem(pyImpFindModuleRes, 1),
PyTuple_GetItem(pyImpFindModuleRes, 2)
  )); 
  return PyObject_CallObject(pyImpLoadModuleFunc, pyImpLoadModuleArgs);
}

which seems to do what I want even if it looks a bit too verbose for my taste 
and I
don't know whether I go the reference counting right.

Thanks for the hint,
Andre'
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Re: wxWindow GetPosition() bug???

2006-08-22 Thread Andre Poenitz

mardif <[EMAIL PROTECTED]> wrote:
> Hi,
> I've found a strange behavior in method GetPosition() of wxWindow class
> 
> ( and derived ).
> On windows, if you create a window object
> 
> frame = wx.Frame(None, -1, "TESTING")
> 
> and you set the position to:
> frame.SetPosition( (300, 45000) )
> 
> If you call method GetPosition, the result will be:
> frame.GetPosition()
> >>> (300, 32767)
> 
> 32767 is the integer limit. Why GetPosition() returns this value??? and
> 
> why on Unix Platform this problem was not found??
> 
> thx very much!

Traditionally, there was a 16(15?) bit limit for coordinates on X Window
systems.

Maybe the wx implementations tries to be smarter than X itself and
restricts the positions artificially. Maybe Windows has sch a limit 
itself...

I don't really know, other than 'never try to access coordinates
that are 'much' bigger than what is actually visible'...

Andre'
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Re: How to download a web page just like a web browser do ?

2006-08-23 Thread Andre Meyer

You get websucker.py in the standard Python installation. On Win look at C:\Python24\Tools\webchecker or similar.regardsAndre
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Dumping the state of a deadlocked process

2006-10-06 Thread andre . naess

Hi all

I'm currently having some issues with a process getting deadlocked. The
problem is that the only way I can seem to find information about where
it deadlocks is by making a wild guess, insert a pdb.set_trace() before
this point, and then step until it locks up, hoping that I've guessed
right.

The frustrating part is that most of the time my guesses are wrong.

It would be really nice if I could send the python process some signal
which would cause it to print the current stacktrace and exit
immediately. That way I would quickly be able to pinpoint where in the
code the deadlock happens. Java has a somewhat similar feature where
you can send a running VM process a SIGQUIT, to which it will respond
by dumping all current threads and lots of other information on stdout.

Is this possible somehow?

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Re: Dumping the state of a deadlocked process

2006-10-07 Thread andre . naess

MrJean1 wrote:
> Did you try using the signal module?  If not, a basic example is here
>  which may need to be
> extended.

I looks useful. I gave it a try, and the only weakness it has is that
when my process locks, it locks so badly that it doesn't respond to
CTRL-C, or any other signal. But by sending it a SIGQUIT which causes
it to dump the current state, and then kill it, I get the dump I need.

This is actually not a multi-threaded app. It's an application which
uses a SQL DB. The problem I was having was that I had a cursor which
started a transaction, and then never finished. Then some other cursor
came along and tried to perform a delete table, and they both locked
up. The cursor isn't ending it's transaction, and the transaction
prevents the delete table from being executed. Luckily Postgresql
allows me to list current activity, otherwise I would have been
scratching my head still.

Using logging or print statements to debug this sort of things is
highly unsatisfactory. I think the way Java uses SIGQUIT is pretty
neat, are there any reasons why Python can't adopt something similar?

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Re: Feature Request: Py_NewInterpreter to create separate GIL (branch)

2006-11-03 Thread Andre Meyer

Hi allStrange enough, there does not even seem to be interest in removing the GIL in Python 3000.For some interesting answers on this topic you may read through the thread "Kill GIL" on the py3k mailing list archives:
<http://mail.python.org/pipermail/python-3000/2006-September/thread.html>.kind regardsAndré
On 11/3/06, robert <[EMAIL PROTECTED]> wrote:
Feature Request: Py_NewInterpreter to create separate GIL (branch)Daniel Dittmar wrote:> robert wrote:>> I'd like to use multiple CPU cores for selected time consuming Python>> computations (incl. numpy/scipy) in a frictionless manner.
>>>> Interprocess communication is tedious and out of question, so I>> thought about simply using a more Python interpreter instances>> (Py_NewInterpreter) with extra GIL in the same process.
>> If I understand Python/ceval.c, the GIL is really global, not specific> to an interpreter instance:> static PyThread_type_lock interpreter_lock = 0; /* This is the GIL */>Thats the show stopper as of now.
There are only a handfull funcs in ceval.c to use that very global lock. The rest uses that funcs around thread states.Would it be a possibilty in next Python to have the lock separate for each Interpreter instance.
Thus: have *interpreter_lock separate in each PyThreadState instance and only threads of same Interpreter have same GIL?Separation between Interpreters seems to be enough. The Interpreter runs mainly on the stack. Possibly only very few global C-level resources would require individual extra locks.
Sooner or later Python will have to answer the multi-processor question.A per-interpreter GIL and a nice module for tunneling Python-Objects directly between Interpreters inside one process might be the answer at the right border-line ? Existing extension code base would remain compatible, as far as there is already decent locking on module globals, which is the the usual case.
Robert--http://mail.python.org/mailman/listinfo/python-list-- Dr. Andre P. Meyer
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dictionaries vs. objects

2006-08-24 Thread Andre Meyer

Hi allI have the following question: I need a representation of a physically inspired environment. The environment contains a large number of objects with varying attributes. There may be classes of objects, but there is not necessarily a strictly defined hierarchy among them. Object access should be fast, because there a many objects that change often (
e.g., moving objects).My approach is to use a dictionary for the environment model and store each object as a slot, which contains either a dictionary or an object. Now, which is better? What is the performance of Python to look up attributes as either slots of a dictionary or attributes of an object? What feels more logical? What is more pythonic and performs better? Which is constructed and modified easier and quicker? Are there effects that I am not yet aware of?
thanks for your thoughtsAndre
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performance of dictionary lookup vs. object attributes

2006-08-25 Thread Andre Meyer


Hi all

I was wondering about the performance comparison of either using a
dictionary or an object for a large collection of "things". Therefore
I have run the attached test. I create a dictionary and an object.
Both get the same number of items/attributes, respectively. Then, for
both the values are read often (iterations).

Here are the results:

attributes 100
iterations 100
dic 25.515999794
obj 138.57172

Is the test meaningful and are you surprised by the results? I am,
actually, because I would have assumed that attribute access with an
object should be faster because lookup can be precompiled.

kind regards
Andre
import time
import random

ITERATIONS = 100
ATTRIBUTES = 100

class O(object):
pass

class Test(object):
def __init__(self):
self.attributes = []
self.dic = {}
self.obj = O()

for i in range(ATTRIBUTES):
value = ""
for s in range(12):
value = value + chr(random.randint(ord('a'), ord('z')))
#print value

attr = ""
for s in range(6):
attr = attr + chr(random.randint(ord('a'), ord('z')))
#print attr

self.attributes.append(attr)
self.dic[attr] = value
self.obj.__setattr__(attr, value)

print "attributes", len(self.attributes)

def run_dic(self):
t0 = time.time()
for i in range(ITERATIONS):
for a in self.attributes:
v = self.dic[a]
#print i, v
t1 = time.time()
return t1 - t0

def run_obj(self):
t0 = time.time()
for i in range(ITERATIONS):
for a in self.attributes:
v = self.obj.__getattribute__(a)
#print i, v
t1 = time.time()
return t1 - t0

print "iterations", ITERATIONS

t = Test()
td = t.run_dic()
to = t.run_obj()

print "dic", td
print "obj", to
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Re: performance of dictionary lookup vs. object attributes

2006-08-25 Thread Andre Meyer

Good points! It's always good to learn from the pros!

So, what it means is that the test is not meaningful, because of the
different way that object attributes are accessed (not as o.x, which
could be compiled).

Nevertheless, the general impression remains that dicts *are* faster
than objects, because attribute lookup uses dicts itself. Is that
correct?

thanks
Andre


On 8/25/06, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> Andre Meyer wrote:
>
> > Is the test meaningful and are you surprised by the results?
>
> surprised by the amount of code you needed to test this, at least.  and you
> might wish to use the proper spelling for
>
> v = self.obj.__getattribute__(a)
>
> which is
>
> v = getattr(obj, a)
>
> and is quite a bit faster, at least in CPython.
>
> (you should also use setattr() instead of __setattr__; in general, if you 
> find your-
> self *calling* a method named __method__, there's most likely a better way to
> do it).
>
> > I am, actually, because I would have assumed that attribute access with an
> > object should be faster because lookup can be precompiled.
>
> huh?  you're using a reflection API; there's no way the compiler can figure 
> out
> in advance what you're going to pass to getattr().
>
> 
>
>
>
> --
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>


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TNO Defence, Security and Safety  http://www.tno.nl/
Delft Cooperation on Intelligent Systems  http://www.decis.nl/

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Re: Learning Python

2006-08-26 Thread Andre Meyer

http://www.python.org/download/releases/2.4/bugs/IDLE now executes code in a separate process.  To communicate
between the main process and executing processes, IDLE opens a
socket to 127.0.0.1 (the local machine).  Some firewalls running on
Windows machines interfere with this and can cause either silent
failures or erroneous popup windows from the firewall.  This problem
only occurs if you run a firewall on the same machine as IDLE.
hthAndre
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Re: Persistent Session in CGI

2006-08-27 Thread Andre Meyer

Karrigell is a very easy-to-use pure-Python web framework. It has examples of session management.http://karrigell.sourceforge.net/regardsAndre
On 27 Aug 2006 14:48:05 -0700, [EMAIL PROTECTED] <[EMAIL PROTECTED]
> wrote:Hi,I have started a new small web project, and was wondering if there are
any good guides on how to do Persistent Sessions and Authenticationusing python and CGI. I don't really want too use Zope, because It'sprobably overkill for my tiny project.--
http://mail.python.org/mailman/listinfo/python-list-- Dr. Andre P. Meyerhttp://python.openspace.nl/meyer
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Re: Pros/Cons of Turbogears/Rails?

2006-08-28 Thread Andre Meyer

Hi allIt might be interesting to watch the videos about Django and Rails (http://www.djangoproject.com/snakesandrubies/). Django makes a good impression, although I would not agree with all of their arguments (eg. templating language, ajax). Most striking, though, is the difference in attitude! While Django grew out of a production environment and solves real problems very elegantly, Rails comes "out of beauty", whatever that means. Is Ruby code more beautiful than Python - don't think so.
Nevertheless, I agree with original statement that we Python guys need to look very closely at Ruby and why they are able to catch so much attention. There are good things in the language and Python marketing could certainly be improved. The new web site and logo are good steps in the right direction. Now for free t-shirts to create pervasive awareness? ;-)
regardsAndre
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Re: dictionaries vs. objects

2006-08-31 Thread Andre Meyer

On 8/28/06, Steve Holden <[EMAIL PROTECTED]> wrote:
Andre Meyer wrote:> Hi all>> I have the following question: I need a representation of a physically> inspired environment. The environment contains a large number of objects> with varying attributes. There may be classes of objects, but there is
> not necessarily a strictly defined hierarchy among them. Object access> should be fast, because there a many objects that change often ( e.g.,> moving objects).>> My approach is to use a dictionary for the environment model and store
> each object as a slot, which contains either a dictionary or an object.> Now, which is better? What is the performance of Python to look up> attributes as either slots of a dictionary or attributes of an object?
> What feels more logical? What is more pythonic and performs better?> Which is constructed and modified easier and quicker? Are there effects> that I am not yet aware of?>I'd suggest using objects: quite apart from the fact that name lookup in
a namespace is pretty much equivalent to a dictionary lookup (namespacesuse an internal optimised dictionary-style object) remember that objectscan have methods, and that the names are given as attributes rather than
as strings.From another thread I learned that lookup in dictionaries is way faster than accessing object attributes (which makes use of an internal dictionary). However, the syntax is cleaner with objects and having methods and properties is a plus. So, it seems like it is about speed vs. elegance...
regardsAndre
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Re: threading support in python

2006-09-05 Thread Andre Meyer

This seems to be an important issue and fit for discussion in the context of Py3k. What is Guido's opinion?As a developer of a multi-threaded system I would like to know more about these issues, so it's no time wasted for me... ;-)
regardsAndreOn 9/5/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Steve> Given the effort that GIL-removal would take, I'm beginning toSteve> wonder if PyPy doesn't offer a better way forward than CPython,
Steve> in terms of execution speed improvements returned perSteve> developer-hour.How about execution speed improvements per hour of discussion about removingthe GIL? ;-)

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Re: IDE

2006-09-06 Thread Andre Meyer

http://pydev.sourceforge.net/http://wiki.python.org/moin/PythonEditors
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Re: python vs java

2006-09-06 Thread Andre Meyer

http://www.ferg.org/projects/python_java_side-by-side.html
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Re: the first arg to super() must be a type, not a class obj?

2006-09-08 Thread Andre Meyer

Another thing: how does super() work wrt. multiple inheritance? It seems like it returns only the first superclass.regardsAndreOn 9/8/06, 
Georg Brandl <[EMAIL PROTECTED]> wrote:
metaperl wrote:> On p.282 of "Python Cookbook" and in the Python docs on calling super:> http://www.python.org/download/releases/2.2.3/descrintro/#cooperation
>> it is clear that the first argument to super is a class and not a type.> However, for the code below, I am getting an error when attempting to> provide a class as my first argument and don't understand why. Also,
> since this is my first attempt at writing anything of any seriousness> in Python, any other feedback is welcome."super" only works for new-style classes.You could make "ftputilx" new-style by inheriting from object and FTPHost,
but FTPHost is still old-style, and I don't know if that's okay with super.So in your case it would be advisable to useFTPHost.__init__(self)instead ofsuper(ftputilx, self).__init__()
Georg--http://mail.python.org/mailman/listinfo/python-list-- Dr. Andre P. Meyer
http://python.openspace.nl/meyerTNO Defence, Security and Safety  http://www.tno.nl/Delft Cooperation on Intelligent Systems  
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Re: Building Python Based Web Application

2006-09-09 Thread Andre Meyer

Karrigell can really be recommended. Simple, but powerful. No need for SQL (though it can), just use the pure Python buzhug, Karrigell services and (Cheetah) templates. Works great.regardsAndre
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Re: best small database?

2006-09-11 Thread Andre Meyer

buzhug is a nice one: http://buzhug.sourceforge.net/ (not sure about binaries, though).greetingsAndreOn 9/11/06, 
km <[EMAIL PROTECTED]> wrote:
checkout gadfly database.regards,KMOn 9/11/06, David Isaac
 <[EMAIL PROTECTED]> wrote:

I have no experience with database applications.This database will likely hold only a few hundred items,including both textfiles and binary files.I would like a pure Python solution to the extent reasonable.
Suggestions?Thank you,Alan Isaac--http://mail.python.org/mailman/listinfo/python-list


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Re: Help me use my Dual Core CPU!

2006-09-17 Thread Andre Meyer

You may, of course, also have a look at JavaSpaces or TSpaces (both in Java).JavaSpaceshttp://java.sun.com/docs/books/jini/javaspaces/
http://java.sun.com/developer/technicalArticles/tools/JavaSpaces/index.htmlhttp://www.javaworld.com/jw-11-1999/jw-11-jiniology.htmlTSpaces
http://www.almaden.ibm.com/cs/TSpaces/http://www.alphaworks.ibm.com/tech/tspacesOr read the original tuple space articles by David Gelernter:
http://en.wikipedia.org/wiki/David_Gelernterhttp://portal.acm.org/citation.cfm?id=2433
http://citeseer.ist.psu.edu/14383.htmlTuple spaces are cool ;-)On 9/17/06, Ramon Diaz-Uriarte <
[EMAIL PROTECTED]> wrote:On 17 Sep 2006 00:55:09 -0700, Paul Rubin<"
http://phr.cx"@nospam.invalid> wrote:> "Ramon Diaz-Uriarte" <[EMAIL PROTECTED]> writes:> > You might also want to check
> > http://www.lindaspaces.com/products/NWS_overview.html52> > by the guys who "invented" Linda.>> Cool, I guess.
I've only played a little bit with it, but it does certainly looknice. Nick Carriero (from network spaces) also developed a similarthing for R, the GNU S statistical programming language (also from the
above url), and the demonstration I saw of it was _really_ impressive.> I looked at these.  Oz/Mozart is a whole nother language, worth> examining for its ideas, but the implementation is quite slow.
Yes, that is true. On the plus side, though, the "Concepts,techniques, and models of computer programming" book, by Van Roy andHaridi, uses Oz/Mozart, so you get a thorough, pedagogical, andextended ---900 pages--- "tutorial" of it. But the speed and, so far,
limited ways of being friendly to other languages, can be showstoppers.> Kamaelia doesn't attempt concurrency at all.  Its main idea is to use> generators to simulate microthreads.  Candygram is a module that lets
> you write code in Python that's sort of like Erlang code, but it uses> OS threads for the equivalent of Erlang processes.  That misses the> point of Erlang pretty badly, which is that processes are extremely
> lightweight (i.e. normally they are microthreads) so you can have> millions of them active simultaneously (e.g. one for each active> telephone connected to a big phone switch).Thanks for the clarification (I had only cursorily looked at them).
>> Right now I want to check out GHCI (the Glasgow Haskell compiler),> which may be the closest thing to a "winner":>>   - very advanced language, even higher level than Python, once described
> by somebody as "what Python should have become">   - native code compilation>   - lock-free concurrency using software transactional memory (STM)Thanks for this. I'll check it out!!
Best,R.--http://mail.python.org/mailman/listinfo/python-list-- Dr. Andre P. Meyer
http://python.openspace.nl/meyerTNO Defence, Security and Safety  http://www.tno.nl/Delft Cooperation on Intelligent Systems  
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Re: Porting Tkinter application to JYthon

2006-11-23 Thread Andre Burgaud


Hi Sandip,

JPype could be a solution to implement the second option mentioned by Tim:
http://jpype.sourceforge.net/

Thanks,

Andre
http://www.burgaud.com/




On 23 Nov 2006 05:36:46 -0800, Tim N. van der Leeuw <[EMAIL PROTECTED]>
wrote:


Hi,

sandip desale wrote:
> Dear All,
>
> We have a Tcl/Tk application written using Python 2.2. Using this
application we want to call some customizable Java APIs. I tried porting
Tcl/Tk application to Jython but not able to do the same as TKinter library
is not available with JYthon.
>
> Can you please help me in porting Tkinter application to Jython? Also
kindly let me know how to do the same.

Not having Tkinter in Jython, you can either rewrite your app to be a
Java Swing app, or you can embed the Java JVM into the Python
interpreter as an importable library. I believe some projects exist to
enable the latter, although I don't know of a URL.

Cheers,

--Tim
>
>
> Thanks & Regards,
> Sandip Desale
>
>
> --
>
> Search for products and services at:
> http://search.mail.com

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synching with os.walk()


Hi all

os.walk() is a nice generator for performing actions on all files in a
directory and subdirectories. However, how can one use os.walk() for walking
through two hierarchies at once? I want to synchronise two directories (just
backup for now), but cannot see how I can traverse a second one. I do this
now with os.listdir() recursively, which works fine, but I am afraid that
recursion can become inefficient for large hierarchies.

thanks for your help
André
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Re: synching with os.walk()

That sounds like a good approach.

On 24 Nov 2006 08:27:09 -0800, Paddy <[EMAIL PROTECTED]> wrote:

Andre Meyer wrote:

> Hi all
>
> os.walk() is a nice generator for performing actions on all files in a
> directory and subdirectories. However, how can one use os.walk() for
walking
> through two hierarchies at once? I want to synchronise two directories
(just
> backup for now), but cannot see how I can traverse a second one. I do
this
> now with os.listdir() recursively, which works fine, but I am afraid
that
> recursion can become inefficient for large hierarchies.
>
> thanks for your help
> André

Walk each tree individually gathering file names relative to the head
of the tree and modification data.

compare the two sets of data to generate:
1. A list of what needs to be copied from the original to the copy.
2. A list of what needs to be copied from the copy to the original

Do the copying.

|You might want to show the user what needs to be done and give them
the option of aborting after generating the copy lists.

- Paddy.

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Re: synching with os.walk()


What I forgot to mention is that I want this to run unmodified from both
Windows and Linux (and Mac). Otherwise, there are enough options to choose
from, besides developing it myself, I guess.

On 24 Nov 2006 08:37:13 -0800, Paddy <[EMAIL PROTECTED]> wrote:



Paddy wrote:

> Andre Meyer wrote:
>
> > Hi all
> >
> > os.walk() is a nice generator for performing actions on all files in a
> > directory and subdirectories. However, how can one use os.walk() for
walking
> > through two hierarchies at once? I want to synchronise two directories
(just
> > backup for now), but cannot see how I can traverse a second one. I do
this
> > now with os.listdir() recursively, which works fine, but I am afraid
that
> > recursion can become inefficient for large hierarchies.
> >
> > thanks for your help
> > André
>
> Walk each tree individually gathering file names relative to the head
> of the tree and modification data.
>
> compare the two sets of data to generate:
>  1. A list of what needs to be copied from the original to the copy.
>  2. A list of what needs to be copied from the copy to the original
>
> Do the copying.
>
> |You might want to show the user what needs to be done and give them
> the option of aborting after generating the copy lists.
>
> - Paddy.
P.S. If you are on a Unix type system you can use tar to do the copying
as you can easily compress the data if it needs to go over a sow link,
and tar will take care of creating any needed directories in the
destination if you create new directories as well as new files.
- Paddy.

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TNO Defence, Security and Safety  http://www.tno.nl/
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Ah, this is obviously some strange usage of the word 'safe' that I wasn't
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Re: synching with os.walk()


Cool, this seems to work.

thanks!


On 24 Nov 2006 08:12:08 -0800, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:


> os.walk() is a nice generator for performing actions on all files in a
> directory and subdirectories. However, how can one use os.walk() for
walking
> through two hierarchies at once? I want to synchronise two directories
(just
> backup for now), but cannot see how I can traverse a second one. I do
this
> now with os.listdir() recursively, which works fine, but I am afraid
that
> recursion can become inefficient for large hierarchies.

I've run into wanting to work with parallel directory structures
before, and what I generally do is something like:

for root, dirs, files in os.walk( dir1 ):
  dir2_root = dir2 + root[len(dir1):]
  for f in files:
dir1_path = os.path.join( root, f )
dir2_path = os.path.join( dir2_root, f )

Does this work for your needs?
-- Nils

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route planning

2006-12-01 Thread Andre Meyer


Hi all

Just a very simple question: where can I find a module for route planning?

I have looked around and found some implementations of graph theory, e.g.
http://sourceforge.net/projects/pynetwork/. But, what I need is not an
abstract graph, but one where nodes/vertices have locations (2D), are
connected (to follow a path, respecting distance among nodes) and where I
can easily find the closest edge and vertex from any point in space.

your links are much appreciated
thanks
André
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Re: Python Plugin for Web Browser

2006-12-06 Thread Andre Meyer

Hi

I was looking for something similar in the past and could not find it. It
would be very useful to have Python applets in web pages. What would you use
them for?

kind regards
André

On 5 Dec 2006 23:59:29 -0800, Sébastien Ramage <[EMAIL PROTECTED]>
wrote:

des exemples de plugins pour IE oui mais qui ne sont pas embarqué dans
une page Web
je souhaiterai créer qqchose qui ressemble vraiment à Java VM ou
Flash
J'ai trouvé un début de réponse pour Firefox en télécharger le
GeckoSDK
mais je n'arrive pas à compiler les exemples pour le moment...

merci

MC a écrit :

> Bonjour !
>
> Pour IE, il y a des exemples de plugins, fournis avec PyWin32.
> Pour FF (comme pour Opera), je ne sais pas.
>
> --
> @-salutations
>
> Michel Claveau

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Re: Python Plugin for Web Browser

2006-12-06 Thread Andre Meyer

Hi Sebastien

Yes, I am a developer, but not C/C++. I have done Java (and many other
languages) in the past, but use Python nowadays.

So, I am no help for developing the plugin, sorry. I would want to use it
though for developing richer Web sites in Python, rather than in
JavaScript/Ajax. Having said that: maybe you are also interested in pyjamas
(http://pyjamas.pyworks.org/).

kind regards
André

On 12/6/06, Sebastien Ramage <[EMAIL PROTECTED]> wrote:

Hi

Thank you for your reply.
Yes ! It would be very useful and easy to develop (the applet not the
plugin) !

I don't have real project at this time but, I like Python and use it every
day. Many time I want to make an applet for game, or webcam remote control
but I don't understand and I don't want to learn Java when I know the
powerful python.
Are you a developper? C++ ?

Seb

2006/12/6, Andre Meyer <[EMAIL PROTECTED]>:
>
> Hi
>
> I was looking for something similar in the past and could not find it.
> It would be very useful to have Python applets in web pages. What would you
> use them for?
>
> kind regards
> André
>
>
>
> On 5 Dec 2006 23:59:29 -0800, Sébastien Ramage <[EMAIL PROTECTED]
> > wrote:
> >
> > des exemples de plugins pour IE oui mais qui ne sont pas embarqué dans
> > une page Web
> > je souhaiterai créer qqchose qui ressemble vraiment à Java VM ou
> > Flash
> > J'ai trouvé un début de réponse pour Firefox en télécharger le
> > GeckoSDK
> > mais je n'arrive pas à compiler les exemples pour le moment...
> >
> > merci
> >
> >
> > MC a écrit :
> >
> > > Bonjour !
> > >
> > > Pour IE, il y a des exemples de plugins, fournis avec PyWin32.
> > > Pour FF (comme pour Opera), je ne sais pas.
> > >
> > > --
> > > @-salutations
> > >
> > > Michel Claveau
> >
> >
> >
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
> >
>
>
> --
> Dr. Andre P. Meyer    http://python.openspace.nl/meyer
>
> TNO Defence, Security and Safety   http://www.tno.nl/
> Delft Cooperation on Intelligent Systems  http://www.decis.nl/
>
> Ah, this is obviously some strange usage of the word 'safe' that I
> wasn't previously aware of. - Douglas Adams

--
Dr. Andre P. Meyerhttp://python.openspace.nl/meyer
TNO Defence, Security and Safety  http://www.tno.nl/
Delft Cooperation on Intelligent Systems  http://www.decis.nl/

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Re: funcs without () like print

2006-12-07 Thread Andre Meyer

print is supposed to become a function in Py3k, though.

On 12/7/06, Georg Brandl <[EMAIL PROTECTED]> wrote:

iwl wrote:
> Hello can I make funktions callable without () like print
> at time the interpreter seems to printout the adres when I type the
> function without ()

print is not a function, it's a statement, and as such equivalent to
raise or assert.

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Re: Is anyone using Python for embedded applications?

2006-12-13 Thread Andre Meyer

Not sure what your target embedded platform is, but there is a Python
version for the Nokia S60 mobile phone platform (Symbian).

http://s60.com/

Python for
S60<http://www.forum.nokia.com/info/sw.nokia.com/id/ee447e84-2851-471a-8387-3434345f2eb0/Python_for_S60.html>
Python for S60 allows developers to execute Python commands and run Python
scripts and applications in devices based on S60 Platform. In addition,
developers can execute Python commands and scripts in the emulators of S60
Developer Platform SDKs. Development starts with an interactive console in a
S60 compatible device where Python commands can be executed.

hth
Andre

On 12/12/06, Carl J. Van Arsdall <[EMAIL PROTECTED]> wrote:

I'm aware of a couple python projects for embedded systems. I am
currently considering using Python on an embedded platform to develop a
simple application as a personal project, mostly to see if it will
work. I was wondering if anyone here was using python for anything of
that nature? For those that are involved in these types of projects,
how does development in python differ for embedded projects versus a
non-embedded project? Is there a community standard technique or style
for this type of development (i.e. heavy in OO design? commonly used
patterns?) Are there any good tools to assist for this type of
development environment?

Oh, and if anyone has opinions/facts on why python should not be used in
an embedded platform, I'd like to know that too. I'm somewhat familiar
with pythons needs on a system, but there are a number of things I am
not aware of.

Thanks to everyone for their input!

-carl

Carl J. Van Arsdall
[EMAIL PROTECTED]
Build and Release

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Re: [Edu-sig] automatically grading small programming assignments

2006-12-14 Thread Andre Roberge


Hello Brian,

I do not teach (much to my regrets) but I have been thinking about what you
describe.
See below.

On 12/14/06, Brian Blais < [EMAIL PROTECTED]> wrote:


Hello,

I have a couple of classes where I teach introductory programming using
Python.  What
I would love to have is for the students to go through a lot of very small
programs,
to learn the basic programming structure.  Things like, return the maximum
in a list,
making lists with certain patterns, very simple string parsing,
etc.  Unfortunately,
it takes a lot of time to grade such things by hand, so I would like to
automate it
as much as possible.



I envision a number of possible solutions.  In one solution, I provide a

function
template with a docstring, and they have to fill it in to past a
doctest.  Is there a
good (and safe) way to do that online?  Something like having a student
post code,
and the doctest returns.  I'd love to allow them to submit until they get
it, logging
each attempt.



I may have a partial solution.  I (co-)wrote a program called Crunchy
(crunchy.sf.net)
which, among other features, allow automated correction of code that has to
satisfy a given docstring. As it stands, it only allows self-evaluation i.e.
there's no login required nor is the solution forwarded to someone else.
(This has been requested by others and may, eventually, be incorporated in
Crunchy.)  So, as a tool for learning, it's working; the grading component
is simply not there.  However, the code is open-source and you could adopt
it to your needs ;-)

André


Or perhaps there is a better way to do this sort of thing.  How do others

who teach
Python handle this?


thanks,


Brian Blais

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Re: Python equivilant to msgbox()

2006-02-12 Thread Andre Burgaud

Hi,
 
If you target Windows, you may try ctypes http://starship.python.net/crew/theller/ctypes/:
 
>>> from ctypes import *>>> windll.user32.MessageBoxA(None, "MessageBox Text", "MessageBox Caption", 0)1>>>
 
 
or win32api http://starship.python.net/crew/mhammond/win32/:
>>> import win32api>>> win32api.MessageBox(0, "Text", "Title")1>>>
 
Regards,
 
Andre
http://www.burgaud.com/
 
On 2/12/06, LittlePython <[EMAIL PROTECTED]> wrote:

Is there an equivalent to a msgbox() or wscript.echo (via wcsript) . I would like to call this instead of print (to the screen) . I would like to write a simple script that is not an event drive gui but calls input boxes, message boxes, or maybe even a file open browser box as well? 
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Re: Python equivilant to msgbox()

2006-02-13 Thread Andre Roberge

On 2/13/06, Peter Decker <[EMAIL PROTECTED]> wrote:
> On 12 Feb 2006 17:27:56 -0800, André <[EMAIL PROTECTED]> wrote:
>
> > It's also possible to something like that with wxPython.  Try:
> > import wx
> > app = wx.PySimpleApp()
> > dlg = wx.TextEntryDialog(None, 'Enter value', 'Title', '')
> > if dlg.ShowModal() == wx.ID_OK:
> > val = dlg.GetValue()  # this line should be indented
> > dlg.Destroy()
> > print "you have entered %s" % val
>
> That's the sort of butt-ugly code that got me convinced that Dabo is
> the way to go. To get a simple message box, you have to create it,
> show it, check a return value against an ugly constant (make sure you
> don't forget an use wx.OK instead!), and then remember to destroy it
> or your app will hang.
>
> The same code in Dabo is:
>
> val = dabo.ui.getString("Enter value", "Some Title")
> if val in None:
>print "You canceled"
> else:
>print "You entered %s" % val
>
> Look at both examples, and tell me which looks more Pythonic to you.

While I agree that dabo's version is more Pythonic than wxPython, my
understanding is that dabo is built on top of wxPython.  There are
other framework (wax, anygui) that also aim to make the coding "more
pythonic", hiding "ugly" wxPython details.  Personnally, I am hesitant
to start using an extra layer on top of wxPython, with no guarantee
that it will be always updated.  Ideally, something like dabo+wxPython
would become part of the standard Python distribution.

The original post was asking if it was possible to have such message
dialogs using Python, without having a full gui app.  I'd say that the
answer is yes... and that one has a lot of options, depending on how
many packages one is ready to download.

André
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Re: c[:]()

2007-06-01 Thread Andre Engels

2007/6/1, Warren Stringer <[EMAIL PROTECTED]>:

> I am not insisting on anything. I use ``c[:]()`` as shorthand way of saying
> "c() for c in d where d is a container"
>
> Having c() support containers seems obvious to me. It jibes with duck
> typing. Perhaps the title of this thread should have been: "Why don't
> containers quack?"
>
> A change is surprising only if it breaks something. I still haven't seen any
> code that breaks by making such a change. Seeing such code would teach a
> great deal.

I think it very much bites duck typing. Currently, if I try to execute
a string or a list or whatever, I get:

TypeError: 'str' object is not callable

But under your proposed semantics, suppose a is a list with some
executable and some non-executable elements. What should

a()

now give? It cannot be a TypeError, because a list (in your semantics)
is callable. Whatever error it gives, and whether or not the preceding
executables are executed first, it will not be an existing error
acting the way it normally does - there is no Python error for "you
cannot do this with this object, but you can do it with other objects
of the same type". And that does not seem to be a case of "We have
never needed it yet" - the join method seems to have been specifically
tailored so that no such error is needed.


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Re: error when calling method of class

2007-06-08 Thread Andre Engels

2007/6/8, Sean Farrow <[EMAIL PROTECTED]>:
> Hi:
> I have defined a class in that class is a method defined as follows:
> def splitTime(n):
> seconds =float(n)
> I call the method in another procedure as follows:
> sefl.splitTime(200)
> the traceback states that splitTime takes one argument two given. why is
> this occuring?
> if I try calling it like:
> splitTime(200)
> I get a name resultion error saying that the global name splitTime is
> not defined.
> Any help apreciated.

In self.splitTime(200), self is considered an argument as well, thus
the definition should be done with:

def splitTime(self,n):

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Ang roskilde billet

2007-06-09 Thread andre lerche


Hej

Jeg er interesseret i at købe din billet, jeg bor selv på amager, så vi kan
gøre en hurtig handel.

Mvh

André
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Re: skip next item in list

2007-06-11 Thread Andre Engels

2007/6/11, ahlongxp <[EMAIL PROTECTED]>:
> list=('a','d','c','d')
> for a in list:
> if a=='a' :
> #skip the letter affer 'a'
>
> what am I supposed to do?

There might be better ways to do it, but I would do:

flag_last_a = False
for a in list:
   if flag_last_a:
   flag_last_a = False
   continue
   if a=='a':
   flag_last_a = True
   # Whatever is done when you don't skip

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Re: a question about unicode in python

2007-06-13 Thread Andre Engels

2007/6/12, WolfgangZ <[EMAIL PROTECTED]>:
> hzqij schrieb:
> > i have a python source code test.py
> >
> > # -*- coding: UTF-8 -*-
> >
> > # s is a unicode string, include chinese
> > s = u'张三'
> >
> > then i run
> >
> > $ python test.py
> > UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-1:
> > invalid data
> >
> > by in python interactive, it is right
> >
> >>>> s = u'张三'
> >
> > why?
> >
> >
>
> just an idea: is your text editor really supporting utf-8? In the mail
> it is only displayed as '??' which looks for me as the mail editor did
> not send the mail as utf. Try to attach a correct text file.

That must be your mail client, not his text editor or mail client. I
do see two Chinese characters in the message.

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Re: web page text extractor

2007-07-12 Thread Andre Engels

2007/7/12, kublai <[EMAIL PROTECTED]>:

> For a project, I need to develop a corpus of online news stories.  I'm
> looking for an application that, given the url of a web page, "copies"
> the rendered text of the web page (not the source HTNL text), opens a
> text editor (Notepad), and displays the copied text for the user to
> examine and save into a text file. Graphics and sidebars to be
> ignored. The examples I have come across are much too complex for me
> to customize for this simple job. Can anyone lead me to the right
> direction?

def textonly(url):
   # Get the HTML source on url and give only the main text
   f = urllib2.urlopen(url)
   text = f.read()
   r = re.compile('\<[^\<\>]*\>')
   newtext = r.sub('',text)
   while newtext != text:
  text = newtext
  newtext = r.sub('',text)
   return text



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Re: web page text extractor

2007-07-12 Thread Andre Engels

2007/7/12, Andre Engels <[EMAIL PROTECTED]>:

I forgot to include

import urllib2, re

here

> def textonly(url):
># Get the HTML source on url and give only the main text
>f = urllib2.urlopen(url)
>text = f.read()
>r = re.compile('\<[^\<\>]*\>')
>newtext = r.sub('',text)
>while newtext != text:
>   text = newtext
>   newtext = r.sub('',text)
>return text


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Re: Coming from delphi - looking for an IDE - willing to spend money

2006-04-24 Thread Andre Burgaud

Hi James,There are many different IDE available for Python, but if you are coming from Delphi, you may find interesting to try PyScripter available at http://mmm-experts.com/Products.aspx?ProductID=4
. For a list of availale Python IDE and editors, you cmay also check this page: http://wiki.python.org/moin/PythonEditors.HTHAndre
http://www.burgaud.comOn 24 Apr 2006 17:34:12 -0700, Just call me James <[EMAIL PROTECTED]> wrote:
Hi,Coming away from the luxury of the delphi IDE has been something of ashock.
As a consequence I've become aware that maybe I need to spend somemoney on a python IDE.As a beginner I reckon integrated debugging would be helpful.Does anyone have any advice or suggestions? So far I've glanced at
Komodo, but as a beginner I'm not in a positon to evaluate it.thanks for exprienced advice,Greg--http://mail.python.org/mailman/listinfo/python-list

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Re: Generic string import like in strptime?

2008-01-16 Thread Andre' John

Nice. Thanks a lot.

Andre


On Wed, 16 Jan 2008, Paul Hankin wrote:

> On Jan 16, 8:34 am, Andre <[EMAIL PROTECTED]> wrote:
> > Hi there
> >
> > Is there a function like strptime, which takes a string and converts it
> > into an array depending on a format string I provide. Like:>>> a = 
> > '3456\tblub-blib.0.9'
> > >>> b = '%d\t%s-%s.%f'
> > >>> c = mysticalfunction(a,b)
> > >>> print c
> >
> > [3456,'blub','blib',0.9]
> 
> Use regular expressions: see http://docs.python.org/lib/node49.html
> 
> --
> Paul Hankin
> 
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psycopg2

2008-01-31 Thread Andre' John

Hi

I am trying to do this for a Postgresql database:

conn = psycopg2.connect('host=localhost')
cur = conn.cursor()
cur.execute("SELECT * FROM names WHERE name=%s", ['S'])

, which doesn't work, and neither does

cur.execute("SELECT * FROM names WHERE name='%s'", ['S'])

or

cur.execute("SELECT * FROM names WHERE name='S'")

work. It always returns:

Traceback (most recent call last):

  File "", line 1, in 

psycopg2.ProgrammingError:  array value must start with ?{½ or 
dimension information


Though, when doing

cur.execute("SELECT * FROM names")

it works.
I am totally helpless here. Does anyone have an idea?

Cheers

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Re: psycopg2

2008-02-01 Thread Andre' John

Thanks very much, this was indeed the problem. That column was an array. 
I created it via GUI and was wondering why it did append a '[]' to the 
variable type, but didn't bother, because there was no other varchar 
available.

Cheers

Andre

PS: Weird though how few results turn up when running that through 
Google.


On Thu, 31 Jan 2008, Steve Holden wrote:

> Andre' John wrote:
> > Hi
> > 
> > I am trying to do this for a Postgresql database:
> > 
> > conn = psycopg2.connect('host=localhost')
> > cur = conn.cursor()
> > cur.execute("SELECT * FROM names WHERE name=%s", ['S'])
> > 
> > , which doesn't work, and neither does
> > 
> > cur.execute("SELECT * FROM names WHERE name='%s'", ['S'])
> > 
> > or
> > 
> > cur.execute("SELECT * FROM names WHERE name='S'")
> > 
> > work.
> 
> I'm more inclined to believe the first two than the third, but I suppose if
> you are telling the truth (House: "Patients always lie") then I am guessing
> you have defined your table's "names" columns to be an array type.
> 
> I haven't worked with those (since they don't confirm to the strict relational
> model I prefer to work with), but I am guessing you might try
> 
> 
> cur.execute("SELECT * FROM names WHERE name='%s'", (['S'], ))
> 
> as this provides the necessary tuple as the second argument to execute, and
> the on;y element of the tuple is a list of a single element.
> 
> > It always returns:
> > 
> > Traceback (most recent call last):
> > 
> >   File "", line 1, in 
> > 
> > psycopg2.ProgrammingError:  array value must start with ?{½ or dimension
> > information
> > 
> > 
> > Though, when doing
> > 
> > cur.execute("SELECT * FROM names")
> > 
> > it works.
> > I am totally helpless here. Does anyone have an idea?
> > 
> If my suggestion doesn't work, you should probably let us know more about the
> structure of your table.
> 
> regards
>  Steve
> -- 
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Re: Python surpasses Perl in popularity?

2008-12-01 Thread Andre Majorel

On 2008-11-30, Stephane Chazelas <[EMAIL PROTECTED]> wrote:
> 2008-11-30, 06:11(+00), Tam Ha:
>> Stephane CHAZELAS wrote:
>>> There's a common confusion in this in the nature of /bin/sh.
>>> There's no standard (neither POSIX nor Unix) that specifies that
>>> /bin/sh should be any variant of the Bourne shell.
>>
>> Sure there is, POSIX.
> [...]
>
> And on this. First, POSIX has no juridiction on defining the
> Bourne shell, let alone its location as the Bourne shell is
> completely outside POSIX, it's a legacy shell and as been for
> years. Then, POSIX makes it clear that the location of its sh
> utility (again, which the Bourne shell is not) is unspecified,
> only that the lookup of "sh" via $PATH in a conformant
> environment should resolve to a conformant "sh".
>
> And if you need some examples to be convinced, see the different
> choices of those 4 different POSIX conformant Unices:
>
> Solaris (7, 8, 9 at least):
>   /bin/sh: legacy Bourne/SVr4 shell
>   /usr/xpg4/bin/sh: a POSIX compliant shell (actually ksh88)
>   Solaris choice was to keep /bin/sh as the Bourne shell for
>   backward compatibility (as changing it for a POSIX shell
>   introduces a slight chance of breaking some existing scripts
>   as there are a few corner-case areas where the POSIX shells
>   are not backward compatible with the Bourne shell), and make
>   /bin a non standard place. How to get a conformant environment
>   (typically one where /usr/xpg4/bin/sh is before /bin) is
>   described in standards(5). The default one is not, which makes
>   Solaris a pain when porting scripts.
>
> HPUX (10.10 and newer at least):
>   /usr/bin/sh (and /bin/sh if there's a symlink /bin ->
>   usr/bin): a POSIX compliant shell (based on ksh88)
>
>   /usr/old/bin/sh: the Bourne shell (though I think nowadays,
>   it's part of an optional package).
>
> Tru64:
>   /bin/sh can behave either as a Bourne shell or a POSIX shell
>   (ksh88) depending on the environment

How does it decide ? argv[0] ? isatty (STDIN_FILENO) ?

> most Linux based systems and most other Unices:
>   /bin/sh is a POSIX compliant shell (bash generally for Linux)
>   and there's no Bourne shell (either there has never been or it
>   has been removed/replaced by a POSIX shell).

Two other Unixen I know of that have a non-POSIX sh are SCO Open
Server and UnixWare. I'm not sure they even provide a
POSIX-compliant alternative like Solaris does.

On the other hand, their utilities (awk, grep, sed et al.) seem
to be POSIX-compliant, at least to the extent that I've always
managed. Unlike Solaris where I've often had to use the ones in
/usr/xpg4/bin.

Many people assume "standard" equates "portable". As far as
shell programming is concerned, the safest way to get portability
is to ignore the standard and code for the Bourne shell.

-- 
André Majorel http://www.teaser.fr/~amajorel/>
"After 15 minutes, I wanted to marry her. After a half hour, I completely
gave up the idea of snatching her purse." -- _Take the Money and Run_
--
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Re: how to find all completely connected sub-graphs?

2009-03-03 Thread Andre Engels

On Tue, Mar 3, 2009 at 7:35 AM, Hyunchul Kim  wrote:

> How can I find all "completely connected subgraphs" in a graph when node and
> edge data are available?
>
> "completely connected subgraph" is a group, all members of which are
> connected to each other.

Here is an algorithm I came up with in a few minutes of thinking,
complexity O(N*SN) with N being the number of nodes in the graph and
SN the sum of the nodes in each connected subgraph (there may well be
faster algorithms, but then you'd probably have to ask someone who
either already knows it, or spends significantly more time on it than
I did) - in pseudocode, but translating pseudocode into Python is an
easy thing to do:

Let N be the nodes in the graph.
A = {emptyset}  # that is, a set containing only the empty set in
the beginning
foreach node k in N:
foreach set a in A:
if k is connected to each node in a:
add k+{a} to A   # in such a way that it's not included in
the loop for the current node k

The completely connected subgraphs are the subgraphs for which the set
of nodes in the subgraph is in A.

-- 
André Engels, andreeng...@gmail.com
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Re: Inverse of dict(zip(x,y))

2009-03-04 Thread Andre Engels

On Wed, Mar 4, 2009 at 11:02 AM, lone_eagle  wrote:

> Can someone suggest a easy method to do the inverse of dict(zip(x,y))
> to get two lists x and y?
>
> So, if x and y are two lists, it is easier to make a dictionary using
> d = dict(zip(x,y)), but if I have d of the form, d = {x1:y1,
> x2:y2, ...}, what is there any trick to get lists x = [x1, x2, ...]
> and y = [y1, y2, ...]

x = d.keys()
y = [d[e] for d in x]

y = d.values() might also work, but I am not sure whether d.keys() and
d.values() are guaranteed to use the same order.


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André Engels, andreeng...@gmail.com
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Re: Inverse of dict(zip(x,y))

On Thu, Mar 5, 2009 at 6:01 PM, Tino Wildenhain  wrote:

> Still I'd like to see an application where this really matters (that
> keys() and values() match in order)

I think there are many such applications, but also that in each of
those cases it's a mis-programming of something that would be done
better and more pythonic using items()...

-- 
André Engels, andreeng...@gmail.com
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Re: Inverse of dict(zip(x,y))

On Thu, Mar 5, 2009 at 7:07 PM, psykeedelik  wrote:

> I usually get properties that I compute, in a dictionary like property
> = [key1: val1, key2:val2, ...] and then I usually want to plot them in
> pylab, which AFAIK requires x and y as lists for the plot argument.
> Then I need to get the lists [key1, key2, ...] and [val1, val2, ...].
> And now I wonder if there a more efficient way doing what I described
> above!! ;)

If the dict = {key1: val1, key2: val2, ...}, you can do:

for key in dict:
plot(key,dictionary[key])



-- 
André Engels, andreeng...@gmail.com
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Re: Inverse of dict(zip(x,y))

On Thu, Mar 5, 2009 at 7:46 PM, Andre Engels  wrote:

> If the dict = {key1: val1, key2: val2, ...}, you can do:
>
> for key in dict:
>    plot(key,dictionary[key])

Of course I meant:

for key in dict:
   plot(key,dict[key])



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André Engels, andreeng...@gmail.com
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Re: While loop