Re: Python arrays and sting formatting options

[Marc 'BlackJack' Rintsch]

On Tue, 30 Sep 2008 23:40:22 +, Steven D'Aprano wrote:

> On Tue, 30 Sep 2008 14:34:31 +, Marc 'BlackJack' Rintsch wrote:
> 
>> There is no array.  The data type is called "list" in Python, so
>> `result` is a nested list.  And in Python it quite unusual to build
>> lists by creating them with the final size filled with place holder
>> objects and then fill the real values in.  Instead lists are typically
>> created by appending values to existing lists, using list comprehension
>> or the `list()` function with some iterable object.
> 
> I would weaken that claim a tad... I'd say it is "usual" to write
> something like this:
> 
> alist = []
> for x in some_values:
> alist.append(something_from_x)
> 
> 
> but it is not uncommon (at least not in my code) to write something like
> this equivalent code instead:
> 
> alist = [None]*len(some_values)
> for i, x in enumerate(some_values):
> alist[i] = something_from_x

I have never done this, except in the beginning I used Python, and -- 
maybe more importantly -- I've never seen this in others code.  I really 
looks like a construct from someone who is still programming in some 
other language(s).

> Most often the first way is most natural, but the second way is
> sometimes more natural.

When will it be more natural to introduce an unnecessary index?

> And Marc, I think you're being a little unfair to the OP, who is clearly
> unfamiliar with Python. I've been using Python for perhaps ten years,
> and I still find your code above dense and hard to comprehend. It uses a
> number of "advanced Python concepts" that a newbie is going to have
> trouble with:
> 
> - the with statement acts by magic; if you don't know what it does, it's
> an opaque black box.

Everything acts by magic unless you know what it does.  The Fortran

  read(*,*)(a(i,j,k),j=1,3)

in the OP's first post looks like magic too.  I admit that my code shows 
off advanced Python features but I don't think ``with`` is one of them.  
It makes it easier to write robust code and maybe even understandable 
without documentation by just reading it as "English text".

> - you re-use the same name for different uses, which can cause
> confusion.

Do you mean `lines`?  Then I disagree because the (duck) type is always 
"iterable over lines".  I just changed the content by filtering.

> - generator expressions.
> 
> - functional programming using partial.
> 
> - you call a function that uses a list comprehension with both map and
> iterator slicing inside it.
> 
> 
> No wonder the OP had trouble with it. *I* have trouble with it, and
> would need to sit down at the interactive interpreter and play around
> with it for a while to be sure what it actually does. If it was your
> intention to make Python look as obtuse and mysterious as possible, you
> almost succeeded. The one things you missed was to replace the
> read_group function with a lambda in the partial.

Well that would make the code harder to understand.  ;-)

Serious, I think it should be easy to understand the code for someone who 
knows Python.  Yes a newbie will have trouble to understand this, but 
Python is not Fortran and IMHO I haven't used something really exotic or 
strange nor did I wrote convoluted and hard to understand things like 
deeply nested list comprehensions.

Ciao,
Marc 'BlackJack' Rintsch
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ssh keepalive

[loial]

I have a problem with a ssh connection in python

I get the error

'NoneType' object has no attribute 'exec_command'

I am thinking that maybe the ssh connection is timeing out.

Since I have no control over the configuration of the ssh server(which
is AIX 5.23), is there anything I can do in python to ensure that the
ssh session does not timeout?

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list to tuple conversion

[sc]

clp:

Thanx to a recent thread I am able to have a print string
with a variable number of formatters -- what I now lack for
the creation of an elegant print statement is a tuple -- 
following is the code, the last line of which does not work:


#!/usr/bin/python
import xml.sax
import eaddyhandler
parser = xml.sax.make_parser()
h = eaddyhandler.EAddyHandler()
parser.setContentHandler(h)
parser.parse(".ea.xml")
for i in range(1, len(h.m)):
k = "r%06d" % i
col = len(h.m[k])
if col > 2 and h.m[k][0] > " ":
print (col * '%-30s') % h.m[k]


What's going on is I have an oocalc spreadsheet for 
e-addresses -- column 1 has the name, and then I keep 
adding e-addresses for ppl when they get new ones, as 
successive entries on their row, meaning each row has
a variable number of e-address columns.  I have an xml
extractor that runs before this script using 
odf.opendocument, which works famously.

My class, EAddyHandler, also works, and builds its dictionary 
of rows in 'm', forgive me, no flames please, I needed a 
short name for the dictionary I have to type it so many times.
The key to 'm' is an 'r' + row number, so I can get
stuff out of it and it's still in the right order, fun
with dictionaries.

What I was hoping for was something that could vary the
source for the print statement as cleanly as the 'col'
multiplication creates the print format, but the list,
'h.m[k]' is not a tuple, it's a list, and I'm just not 
quite where I am trying to get with this.

If there were a builtin function that took a list and 
returned a tuple, I'd be there, but if there is such a
thing I need someone to point me at it.  I can't help
thinking I am missing some obvious construct, and I'll
be advised to go reread the tutorial, but I'm not there,
and if you can take pity on me and point me there, I'll
be your friend for life.  Well -- I'll be grateful...

TIA,

Scott

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Re: Output of pexpect

[Lie Ryan]

On Tue, 30 Sep 2008 20:48:12 -0700, Anh Khuong wrote:


> I am using pexpect and I want to send output of pexpet to both stdout
> and log file concurrently. Anybody know a solution for it please let me
> know.

One way is to create a file-like object that forked the output to stdout 
and the logfile.

class forkwriter(object):
def __init__(self, filename):
self.file = open(filename, 'w')
def write(self, s):
sys.stdout.write(s)
self.file.write(s)

I've never used pexpect myself though, but if pexpect write things to the 
to the stdout, then you can redirect stdout

import sys
sys.stdout =  forkwriter('mylog.log')

(note: the forkwriter class would have to be modified a bit to use the 
"background" sys.__stdout__ instead of sys.stdout)

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Re: list to tuple conversion

[Pekka Laukkanen]

2008/10/1 sc <[EMAIL PROTECTED]>:
> If there were a builtin function that took a list and
> returned a tuple, I'd be there, but if there is such a
> thing I need someone to point me at it.  I can't help
> thinking I am missing some obvious construct, and I'll
> be advised to go reread the tutorial, but I'm not there,
> and if you can take pity on me and point me there, I'll
> be your friend for life.  Well -- I'll be grateful...

>>> tuple

>>> tuple([1,2,3])
(1, 2, 3)
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Re: list to tuple conversion

[Gary M. Josack]

sc wrote:

clp:

Thanx to a recent thread I am able to have a print string
with a variable number of formatters -- what I now lack for
the creation of an elegant print statement is a tuple -- 
following is the code, the last line of which does not work:



#!/usr/bin/python
import xml.sax
import eaddyhandler
parser = xml.sax.make_parser()
h = eaddyhandler.EAddyHandler()
parser.setContentHandler(h)
parser.parse(".ea.xml")
for i in range(1, len(h.m)):
k = "r%06d" % i
col = len(h.m[k])
if col > 2 and h.m[k][0] > " ":
print (col * '%-30s') % h.m[k]


What's going on is I have an oocalc spreadsheet for 
e-addresses -- column 1 has the name, and then I keep 
adding e-addresses for ppl when they get new ones, as 
successive entries on their row, meaning each row has

a variable number of e-address columns.  I have an xml
extractor that runs before this script using 
odf.opendocument, which works famously.


My class, EAddyHandler, also works, and builds its dictionary 
of rows in 'm', forgive me, no flames please, I needed a 
short name for the dictionary I have to type it so many times.

The key to 'm' is an 'r' + row number, so I can get
stuff out of it and it's still in the right order, fun
with dictionaries.

What I was hoping for was something that could vary the
source for the print statement as cleanly as the 'col'
multiplication creates the print format, but the list,
'h.m[k]' is not a tuple, it's a list, and I'm just not 
quite where I am trying to get with this.


If there were a builtin function that took a list and 
returned a tuple, I'd be there, but if there is such a

thing I need someone to point me at it.  I can't help
thinking I am missing some obvious construct, and I'll
be advised to go reread the tutorial, but I'm not there,
and if you can take pity on me and point me there, I'll
be your friend for life.  Well -- I'll be grateful...

TIA,

Scott

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>>> L = [1,2,3,4,5]
>>> t = tuple(L)
>>> t
(1, 2, 3, 4, 5)

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Event-driven framework (other than Twisted)?

[Phillip B Oldham]

Are there any python event driven frameworks other than twisted?
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Are there any python micro-frameworks (like ruby's Camping)?

[Phillip B Oldham]

Are there any python micro-frameworks (like ruby's Camping)?
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Re: ssh keepalive

[Lie Ryan]

On Wed, 01 Oct 2008 00:30:59 -0700, loial wrote:

> I have a problem with a ssh connection in python
> 
> I get the error
> 
> 'NoneType' object has no attribute 'exec_command'
> 
> I am thinking that maybe the ssh connection is timeing out.
> 
> Since I have no control over the configuration of the ssh server(which
> is AIX 5.23), is there anything I can do in python to ensure that the
> ssh session does not timeout?

No, it's a NoneType object (i.e. your variable contains None)
Show us a bit of your code, so we can see why is None there.

My guess is that you're trying to perform something on a function that 
does things in-place and doesn't return anything (e.g. list.append, 
list.sort)

>>> a = [1, 3, 4, 2]
>>> a = a.sort()
>>> print a
[None, None, None, None]

>>> # should be
>>> a = [1, 3, 4, 2]
>>> a.sort()
>>> print a
[1, 2, 3, 4]

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Re: XMLRPC - C Client / Python Server

[care02]

On 30 Sep, 21:58, Michael Torrie <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > I have implemented a simple Python XMLRPC server and need to call it
> > from a C/C++ client. What is the simplest way to do this? I need to
> > pass numerical arrays from C/C++ to Python.
>
> Which do you need, C or C++?  They are two different languages with
> different possibilities for libraries.
>
> As the other poster mentioned, xmlrpc-c is a good one for C, and also
> comes with bindings for C++ which I have used.  Getting xmlrpc-c
> compiled can be a real challenge though.  I recommend you use binary
> packages for your distribution of Linux.  If you need it on Win32, then
> you'll have to spend a day or two figuring out how to build it on
> Windows.  I eventually got the both the C and C++ client library built
> in Mingw with libcurl as the transport.  But it was a real pain.

My problem is that I need xmlrpc-c (preferably the C++ bindings) on
windows. I have just started to build xmlrpc-c on windows, but no
success yet, seems to be quite troublesome. Are there any other xmlrpc
libraries for C/C++ around with prebuilt binaries that work in a
client/server configuration with Python as a xmlrpc server?

Carl

Carl
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Re: XMLRPC - C Client / Python Server

[Chris Rebert]

On Wed, Oct 1, 2008 at 1:05 AM,  <[EMAIL PROTECTED]> wrote:
> On 30 Sep, 21:58, Michael Torrie <[EMAIL PROTECTED]> wrote:
>> [EMAIL PROTECTED] wrote:
>> > I have implemented a simple Python XMLRPC server and need to call it
>> > from a C/C++ client. What is the simplest way to do this? I need to
>> > pass numerical arrays from C/C++ to Python.
>>
>> Which do you need, C or C++?  They are two different languages with
>> different possibilities for libraries.
>>
>> As the other poster mentioned, xmlrpc-c is a good one for C, and also
>> comes with bindings for C++ which I have used.  Getting xmlrpc-c
>> compiled can be a real challenge though.  I recommend you use binary
>> packages for your distribution of Linux.  If you need it on Win32, then
>> you'll have to spend a day or two figuring out how to build it on
>> Windows.  I eventually got the both the C and C++ client library built
>> in Mingw with libcurl as the transport.  But it was a real pain.
>
> My problem is that I need xmlrpc-c (preferably the C++ bindings) on
> windows. I have just started to build xmlrpc-c on windows, but no
> success yet, seems to be quite troublesome. Are there any other xmlrpc
> libraries for C/C++ around with prebuilt binaries that work in a
> client/server configuration with Python as a xmlrpc server?

The whole point of XML-RPC is to be language-neutral, so the "with
Python" part of your requirements is superfluous.
On that note, you might want to try asking in a newsgroup/mailinglist
that's more XML-RPC or Windows or C(++) specific.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com

>
> Carl
>
> Carl
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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Re: Event-driven framework (other than Twisted)?

[Lie Ryan]

On Wed, 01 Oct 2008 01:01:41 -0700, Phillip B Oldham wrote:

> Are there any python event driven frameworks other than twisted?

Most GUI package use event-driven model (e.g. Tkinter).

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Re: list to tuple conversion

[sc]

Gary M. Josack wrote:

> sc wrote:
>> clp:
>>
>> Thanx to a recent thread I am able to have a print string
>> with a variable number of formatters -- what I now lack for
>> the creation of an elegant print statement is a tuple --
>> following is the code, the last line of which does not work:
>>
>> 
>> #!/usr/bin/python
>> import xml.sax
>> import eaddyhandler
>> parser = xml.sax.make_parser()
>> h = eaddyhandler.EAddyHandler()
>> parser.setContentHandler(h)
>> parser.parse(".ea.xml")
>> for i in range(1, len(h.m)):
>> k = "r%06d" % i
>> col = len(h.m[k])
>> if col > 2 and h.m[k][0] > " ":
>> print (col * '%-30s') % h.m[k]
>> 
>>
>> What's going on is I have an oocalc spreadsheet for
>> e-addresses -- column 1 has the name, and then I keep
>> adding e-addresses for ppl when they get new ones, as
>> successive entries on their row, meaning each row has
>> a variable number of e-address columns.  I have an xml
>> extractor that runs before this script using
>> odf.opendocument, which works famously.
>>
>> My class, EAddyHandler, also works, and builds its dictionary
>> of rows in 'm', forgive me, no flames please, I needed a
>> short name for the dictionary I have to type it so many times.
>> The key to 'm' is an 'r' + row number, so I can get
>> stuff out of it and it's still in the right order, fun
>> with dictionaries.
>>
>> What I was hoping for was something that could vary the
>> source for the print statement as cleanly as the 'col'
>> multiplication creates the print format, but the list,
>> 'h.m[k]' is not a tuple, it's a list, and I'm just not
>> quite where I am trying to get with this.
>>
>> If there were a builtin function that took a list and
>> returned a tuple, I'd be there, but if there is such a
>> thing I need someone to point me at it.  I can't help
>> thinking I am missing some obvious construct, and I'll
>> be advised to go reread the tutorial, but I'm not there,
>> and if you can take pity on me and point me there, I'll
>> be your friend for life.  Well -- I'll be grateful...
>>
>> TIA,
>>
>> Scott
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>   
>  >>> L = [1,2,3,4,5]
>  >>> t = tuple(L)
>  >>> t
> (1, 2, 3, 4, 5)

fine, documented now, for the world to see, I'm an idiot,
fine, but anyway, thank you both, I'll shutup now.

sc

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Re: Are there any python micro-frameworks (like ruby's Camping)?

[Sam]

Did you try WebPy?
http://webpy.org/ Hum, the website seems to be down today

Sam
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и матрасы и многое другое.
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Re: Event-driven framework (other than Twisted)?

[Phillip B Oldham]

On Oct 1, 9:25 am, Lie Ryan <[EMAIL PROTECTED]> wrote:
> Most GUI package use event-driven model (e.g. Tkinter).

I've noticed that. I'm thinking more for a web environment (instead of
MVC) or as a HTTP server. I know Twisted has TwistedWeb, but I'm
looking for alternatives.
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Интернет магазин товаров для красоты и здоровья ShopBody Мировые
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Re: Are there any python micro-frameworks (like ruby's Camping)?

[Phillip B Oldham]

On Oct 1, 9:53 am, Sam <[EMAIL PROTECTED]> wrote:
> Did you try WebPy?http://webpy.org/Hum, the website seems to be down today

Not yet - I'm hoping the python community can suggest some examples of
micro/small frameworks (which just supply the basics; no forms/
templating/ORM/etc) so I can compare and select the one which suits my
needs.
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Using Tkinter and Tix together opens a new DOS Window in addition to the actual GUI on windows XP

[dudeja . rajat]

Hi,


I m using Tkinter and Tix. I'm using Tkinter mainly for all the widgets
except for the TixComboBox for which I use Tix.

My event loop starts like this:

myRoot = Tix.Tk()
myRoot.title("Test Automation")#
myAppGUIObject = myAppGUI(myRoot, logger)  #myAPPGUI is the class for
creating GUI
myRoot.mainloop()

The problem is as soon as I doubel click on this script a DOS window opens
up in addition to the GUI.

I don't why is this happening? I assume the problem is becuase I'm using the
statement:
Tix.Tk()
when I'm using tix for only a combo box and the rest of the widgets are
tkinter widgets.


So,
1. Is the above approach fine?
2. How can I stop the dos window from opening up?

-- 
Regrads,
Rajat
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Re: Python arrays and sting formatting options

[Steven D'Aprano]

On Tue, 30 Sep 2008 19:44:40 -0500, Grant Edwards wrote:

> On 2008-09-30, Steven D'Aprano <[EMAIL PROTECTED]>
> wrote:
>> On Tue, 30 Sep 2008 10:57:19 -0500, Grant Edwards wrote:
>>
> How would the python equivalent go ?
>>> 
>>> You would drag yourself out of the 1960s, install numpy, and then do
>>> something like this:
>>
>> I think that was thoughtlessly rude to somebody who is asking a
>> perfectly reasonable question.
> 
> Sheesh.  I guess I should have added a smiley face.
> 
> So much for trying to be helpful.


Oh the rest of your post was helpful. I think you were trying to be 
funny, but I think you failed.




-- 
Steven
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Re: list to tuple conversion

[Gabriel Genellina]

En Wed, 01 Oct 2008 04:51:33 -0300, sc <[EMAIL PROTECTED]> escribió:


Thanx to a recent thread I am able to have a print string
with a variable number of formatters -- what I now lack for
the creation of an elegant print statement is a tuple --
following is the code, the last line of which does not work:

for i in range(1, len(h.m)):
k = "r%06d" % i
col = len(h.m[k])
if col > 2 and h.m[k][0] > " ":
print (col * '%-30s') % h.m[k]



Another alternative would be:

print ''.join('%-30s' % item for item in h.m[k])

You may need to add square brackets [ ] inside the parenthesis () if your  
Python version is older than 2.5


--
Gabriel Genellina

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Re: how to search multiple textfiles ? (Python is slow ?)

[Lawrence D'Oliveiro]

In message <[EMAIL PROTECTED]>, Stef
Mientki wrote:

> Lawrence D'Oliveiro wrote:
>
>> In message <[EMAIL PROTECTED]>, Stef
>> Mientki wrote:
>>
>>> I'm really amazed by the speed of Python !!
>>> It can only be beaten by findstr, which is only available on windows.
>>
>> Did you try find -exec grep -F?
>>   
> well my windows version doesn't understand that :

I assumed when you said "It can only be beaten by findstr, which is only
available on windows", that meant you had tried some non-Windows options,
before concluding that Windows "findstr" was the fastest.
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Re: One class per file?

[Lawrence D'Oliveiro]

In message
<[EMAIL PROTECTED]>, HCB
wrote:

> The book "Code Complete" recommends that you put only one class in a
> source file ...

That would only apply to languages like C with no namespace control.
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Re: Odd Errors

[Lawrence D'Oliveiro]

In message
<[EMAIL PROTECTED]>,
Aaron "Castironpi" Brady wrote:

> Do you ever want to scream from the rooftops, "'append' operates by
> side-effect!"?

No. It's an effect, not a side-effect.
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Re: Comparing float and decimal

[Mark Dickinson]

On Sep 30, 8:07 pm, Terry Reedy <[EMAIL PROTECTED]> wrote:
> Documenting the problem properly would mean changing the set
> documentation to change at least the definitions of union (|), issubset
> (<=), issuperset (>=), and symmetric_difference (^) from their current
> math set based definitions to implementation based definitions that
> describe what they actually do instead of what they intend to do.  I do
> not like this option.

I was thinking more of a single-line warning in the set documentation
to the effect that funny things happen in the absence of transitivity
of equality, perhaps pointing the finger at Decimal as the most
obvious troublemaker;  the Decimal documentation could elaborate on
this.
That is, rather than documenting exactly what the set operations do,
document what they're supposed to do (just as now) and declare that
behaviour is undefined for sets of elements for which transitivity
fails.

> (1A) All that is needed for fix equality transitivity corruption and the
> consequent set/dictview problems is to correctly compare integral
> values.  For this, Decimal hash seems fine already.  For the int i I
> tried, hash(i) == hash(float(i)) == hash(Decimal(i)) ==
> hash(Fraction(i)) == i.

Good point.  Though I'd be a bit uncomfortable with having
Decimal(1) == 1.0 return True, but Decimal('0.5') == 0.5 return False.
Not sure what the source of my discomfort is;  partly I think it's
that I want to be able to explain the comparison rules at the
level of types;  having some floats behave one way and some behave
another feels odd.  And explaining to confused users exactly
why Decimal behaves this way could be fun.

I think I'd prefer option 1 to option 1a.

> (3) Further isolate decimals by making decimals also unequal to all
> ints.  Like (1A), this would easily fix transitivity breakage, but I
> would consider the result less desirable.

I'd oppose this.  I think having decimals play nicely with integers
is important, both practically and theoretically.  There's probably
also already existing code that depends on comparisons between
integers and Decimals working as expected.

So I guess my ranking is 0 > 1 > 1a > 3, though I could live
with any of 0, 1, or 1a.

It's really the decimal module that's breaking the rules here;
I feel it's the decimal module's responsibility to either
fix or document the resulting problems.

It would also be nice if it were made more obvious somewhere
in the docs that transitivity of equality is important
for correct set and dict behaviour.

Mark
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Re: Are there any python micro-frameworks (like ruby's Camping)?

[Michele Simionato]

On Oct 1, 10:58 am, Phillip B Oldham <[EMAIL PROTECTED]> wrote:
> On Oct 1, 9:53 am, Sam <[EMAIL PROTECTED]> wrote:
>
> > Did you try WebPy?http://webpy.org/Hum, the website seems to be down today
>
> Not yet - I'm hoping the python community can suggest some examples of
> micro/small frameworks (which just supply the basics; no forms/
> templating/ORM/etc) so I can compare and select the one which suits my
> needs.

How about wsgiref in the standard library? It is as small as you can
get without
resorting to CGI.
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Re: Are there any python micro-frameworks (like ruby's Camping)?

[Phillip B Oldham]

On Oct 1, 10:29 am, Michele Simionato <[EMAIL PROTECTED]>
wrote:
> How about wsgiref in the standard library? It is as small as you can
> get without resorting to CGI.

Interesting... I'll be sure to check that out also.

Someone also mentioned Paste/WebOb, so now I have 3 to test.

Any others?
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Re: Python arrays and sting formatting options

[Steven D'Aprano]

On Wed, 01 Oct 2008 06:58:11 +, Marc 'BlackJack' Rintsch wrote:


>> I would weaken that claim a tad... I'd say it is "usual" to write
>> something like this:
>> 
>> alist = []
>> for x in some_values:
>> alist.append(something_from_x)
>> 
>> 
>> but it is not uncommon (at least not in my code) to write something
>> like this equivalent code instead:
>> 
>> alist = [None]*len(some_values)
>> for i, x in enumerate(some_values):
>> alist[i] = something_from_x
> 
> I have never done this, except in the beginning I used Python, and --
> maybe more importantly -- I've never seen this in others code.  I really
> looks like a construct from someone who is still programming in some
> other language(s).


It occurs at least twice in the 2.5 standard library, once in 
sre_parse.py:

groups = []
groupsappend = groups.append
literals = [None] * len(p)
for c, s in p:
if c is MARK:
groupsappend((i, s))
# literal[i] is already None
else:
literals[i] = s



and another time in xdrlib.py:

succeedlist = [1] * len(packtest)
count = 0
for method, args in packtest:
print 'pack test', count,
try:
method(*args)
print 'succeeded'
except ConversionError, var:
print 'ConversionError:', var.msg
succeedlist[count] = 0
count = count + 1




>> Most often the first way is most natural, but the second way is
>> sometimes more natural.
> 
> When will it be more natural to introduce an unnecessary index?

We can agree that the two idioms are functionally equivalent. Appending 
is marginally less efficient, because the Python runtime engine has to 
periodically resize the list as it grows, and that can in principle take 
an arbitrary amount of time if it causes virtual memory paging. But 
that's unlikely to be a significant factor for any but the biggest lists.

So in the same way that any while-loop can be rewritten as a recursive 
function, and vice versa, so these two idioms can be trivially re-written 
from one form to the other. When should you use one or the other?

When the algorithm you have is conceptually about growing a list by 
appending to the end, then you should grow the list by appending to the 
end. And when the algorithm is conceptually about dropping values into 
pre-existing pigeon holes, then you should initialize the list and then 
walk it, modifying the values in place.

And if the algorithm in indifferent to which idiom you use, then you 
should use whichever idiom you are most comfortable with, and not claim 
there's Only One True Way to build a list.


>> And Marc, I think you're being a little unfair to the OP, who is
>> clearly unfamiliar with Python. I've been using Python for perhaps ten
>> years, and I still find your code above dense and hard to comprehend.
>> It uses a number of "advanced Python concepts" that a newbie is going
>> to have trouble with:
>> 
>> - the with statement acts by magic; if you don't know what it does,
>> it's an opaque black box.
> 
> Everything acts by magic unless you know what it does.  The Fortran
> 
>   read(*,*)(a(i,j,k),j=1,3)
> 
> in the OP's first post looks like magic too.  

It sure does. My memories of Fortran aren't good enough to remember what 
that does.

But I think you do Python a disservice. One of my Perl coders was writing 
some Python code the other day, and he was amazed at how guessable Python 
was. You can often guess the right way to do something. He wanted a set 
with all the elements of another set removed, so he guess that s1-s2 
would do the job -- and it did. A lot of Python is amazingly readable to 
people with no Python experience at all. But not everything.


> I admit that my code shows
> off advanced Python features but I don't think ``with`` is one of them.
> It makes it easier to write robust code and maybe even understandable
> without documentation by just reading it as "English text".

The first problem with "with" is that it looks like the Pascal "with" 
statement, but acts nothing like it. That may confuse anyone with Pascal 
experience, and there are a lot of us out there.

The second difficulty is that:

with open('test.txt') as lines:

binds the result of open() to the name "lines". How is that different 
from "lines = open('test.txt')"? I know the answer, but we shouldn't 
expect newbies coming across it to be anything but perplexed.

Now that the newbie has determined that lines is a file object, the very 
next thing you do is assign something completely different to 'lines':

lines = (line for line in lines if line.strip())

So the reader needs to know that brackets aren't just for grouping like 
in most other languages, but also that (x) can be equivalent to a for-
loop. They need to know, or guess, that iterating over a file object 
returns lines of the file, and they have to keep the two different 
bindings of "lines" straight in their head in a piece

Re: Odd Errors

[Steven D'Aprano]

On Wed, 01 Oct 2008 22:14:49 +1300, Lawrence D'Oliveiro wrote:

> In message
> <[EMAIL PROTECTED]>,
> Aaron "Castironpi" Brady wrote:
> 
>> Do you ever want to scream from the rooftops, "'append' operates by
>> side-effect!"?
> 
> No. It's an effect, not a side-effect.

"Side-effect" has the technical meaning in functional languages of any 
change of state that isn't the creation and return of a function result.

People who have been influenced by such functional languages, and many 
Python users are, often use the same meaning. I for one have no 
difficulty understanding from context the difference between "append 
operates by side-effect" and "a function which modifies global variables 
is having side-effects".



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Re: One class per file?

[Bruno Desthuilliers]

Lawrence D'Oliveiro a écrit :

In message
<[EMAIL PROTECTED]>, HCB
wrote:


The book "Code Complete" recommends that you put only one class in a
source file ...


That would only apply to languages like C with no namespace control.


classes in C ?-)

OTHO, 'one class per file' is a standard idiom in Java and IIRC in C++ 
(which both have namespaces one way or another)

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Re: Wait or not?

[Christian Heimes]

Eric wrote:

I've been wanting to learn Python for a while now but I can't decide
on whether to wait for Python 3's final release and learn it or just
go ahead and learn 2.x. Would it be hard to make the transition being
a noob?


I suggest you stick to Python 2.5 or 2.6 for now. It's going to take 
several months to years until the majority of 3rd party software 
supports the 3.x series.


Christian

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Re: Shed Skin (restricted) Python-to-C++ compiler 0.0.29

[srepmub]

> Not to sound negative, but what's with the 0.0.x version numbers ?
> Maybe it's just me, but seeing a zero major/minor version give me the
> impression of experimental/pre-alpha project, which (from my very
> limited knowledge) doesn't do justice to shedskin's current state.

I know of too many bugs to be comfortable calling it 0.1 just yet..
And I really want to improve extension module support (as mentioned)
first. There's not much else holding back a 0.1 release.


Thanks,
Mark.



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parse a normal textfile

[devi thapa]

hi all

   I have one normal text file. I need to parse the file, that too
in an associative way .
suppose that below is the normal textfile

name='adf'
id  =1
value=344

So when I give 'name' as an input, the output must be 'adf'

so please help me out with this.

regards,
devi.
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Tix: Windows XP: Problem - how to stop root window from popping up with Tix

[dudeja . rajat]

Hi,

Im using Tix on widows XP and I've tried many ways to suppress the root
window. But so far I'm unable to do it.


Please suggest how can I suppress the root window.

My code is as follows:

import Tix
myRoot = Tix.Tk()

myRoot.withdraw()
myRoot.deiconify()



myRoot.title("Test Automation")
#Create GUI Object and pass the logger object
myAppGUIObject = myAppGUI(myRoot, logger)   #My AppGUI class creates the GUI
which heavily uses the Tkinter widgets and only TixComboBox

myRoot.mainloop()


Please suggest if there is anything I'm missing.


Thanks and regards,
Rajat
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Re: Python arrays and sting formatting options

[Marc 'BlackJack' Rintsch]

On Wed, 01 Oct 2008 09:35:03 +, Steven D'Aprano wrote:

> On Wed, 01 Oct 2008 06:58:11 +, Marc 'BlackJack' Rintsch wrote:
> 
>>> I would weaken that claim a tad... I'd say it is "usual" to write
>>> something like this:
>>> 
>>> alist = []
>>> for x in some_values:
>>> alist.append(something_from_x)
>>> 
>>> 
>>> but it is not uncommon (at least not in my code) to write something
>>> like this equivalent code instead:
>>> 
>>> alist = [None]*len(some_values)
>>> for i, x in enumerate(some_values):
>>> alist[i] = something_from_x
>> 
>> I have never done this, except in the beginning I used Python, and --
>> maybe more importantly -- I've never seen this in others code.  I
>> really looks like a construct from someone who is still programming in
>> some other language(s).
> 
> 
> It occurs at least twice in the 2.5 standard library, once in
> sre_parse.py:
> 
> groups = []
> groupsappend = groups.append
> literals = [None] * len(p)
> for c, s in p:
> if c is MARK:
> groupsappend((i, s))
> # literal[i] is already None
> else:
> literals[i] = s
> 
> and another time in xdrlib.py:
> 
> succeedlist = [1] * len(packtest)
> count = 0
> for method, args in packtest:
> print 'pack test', count,
> try:
> method(*args)
> print 'succeeded'
> except ConversionError, var:
> print 'ConversionError:', var.msg
> succeedlist[count] = 0
> count = count + 1

I guess the first falls into the "micro optimization" category because it 
binds `groups.append` to a name to spare the attribute look up within the 
loop.

Both have in common that not every iteration changes the list, i.e. the 
preset values are not just place holders but values that are actually 
used sometimes.  That is different from creating a list of place holders 
that are all overwritten in any case.

>>> - the with statement acts by magic; if you don't know what it does,
>>> it's an opaque black box.
>> 
>> Everything acts by magic unless you know what it does.  The Fortran
>> 
>>   read(*,*)(a(i,j,k),j=1,3)
>> 
>> in the OP's first post looks like magic too.
> 
> It sure does. My memories of Fortran aren't good enough to remember what
> that does.
> 
> But I think you do Python a disservice. One of my Perl coders was
> writing some Python code the other day, and he was amazed at how
> guessable Python was. You can often guess the right way to do something.

I think my code would be as guessable to a Lisp, Scheme, or Haskell 
coder.  Okay, Lispers and Schemers might object the ugly syntax.  ;-)

>> I admit that my code shows off advanced Python features but I don't
>> think ``with`` is one of them. It makes it easier to write robust code
>> and maybe even understandable without documentation by just reading it
>> as "English text".
> 
> The first problem with "with" is that it looks like the Pascal "with"
> statement, but acts nothing like it. That may confuse anyone with Pascal
> experience, and there are a lot of us out there.

But Python is not Pascal either.  Nonetheless a Pascal coder might guess 
what the ``with`` does.  Not all the gory details but that it opens a 
file and introduces `lines` should be more or less obvious to someone who 
has programmed before.

> The second difficulty is that:
> 
> with open('test.txt') as lines:
> 
> binds the result of open() to the name "lines". How is that different
> from "lines = open('test.txt')"? I know the answer, but we shouldn't
> expect newbies coming across it to be anything but perplexed.

Even if newbies don't understand all the details they should be 
introduced to ``with`` right away IMHO.  Because if you explain all the 
details, even if they understand them, they likely will ignore the 
knowledge because doing it right is a lot of boiler plate code.  So 
usually people write less robust code and ``with`` is a simple way to 
solve that problem.

> Now that the newbie has determined that lines is a file object, the very
> next thing you do is assign something completely different to 'lines':
> 
> lines = (line for line in lines if line.strip())
> 
> So the reader needs to know that brackets aren't just for grouping like
> in most other languages, but also that (x) can be equivalent to a for-
> loop. They need to know, or guess, that iterating over a file object
> returns lines of the file, and they have to keep the two different
> bindings of "lines" straight in their head in a piece of code that uses
> "lines" twice and "line" three times.

Yes the reader needs to know a basic Python syntax construct to 
understand this.  And some knowledge from the tutorial about files.  So 
what?

> And then they hit the next line, which includes a function called
> "partial", which has a technical meaning out of functional languages and
> I am sure it will mean nothing whatsoever to anyone unfamiliar to it.
> It's not something that

Re: Tix: Windows XP: Problem - how to stop root window from popping up with Tix

[Lie Ryan]

On Wed, 01 Oct 2008 11:33:59 +0100, dudeja.rajat wrote:

> Hi,
> 
> Im using Tix on widows XP and I've tried many ways to suppress the root
> window. But so far I'm unable to do it.
> 
> 
> Please suggest how can I suppress the root window.
> 
> My code is as follows:
> 
> import Tix
> myRoot = Tix.Tk()
> 
> myRoot.withdraw()
> myRoot.deiconify()
> 
> 
> 
> myRoot.title("Test Automation")
> #Create GUI Object and pass the logger object myAppGUIObject =
> myAppGUI(myRoot, logger)   #My AppGUI class creates the GUI which
> heavily uses the Tkinter widgets and only TixComboBox
> 
> myRoot.mainloop()
> 
> 
> Please suggest if there is anything I'm missing.
> 
> 
> Thanks and regards,
> Rajat

The root window is the main window, not the DOS box. I think in windows, 
you should use pythonw.exe or something to open the python script so not 
to open a dos box.

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Re: Are there any python micro-frameworks (like ruby's Camping)?

[Marc 'BlackJack' Rintsch]

On Wed, 01 Oct 2008 01:02:24 -0700, Phillip B Oldham wrote:

> Are there any python micro-frameworks (like ruby's Camping)?

Maybe `CherryPy`!?  It's the heart of other frameworks that add 
templating, ORM and the like to it.

Another consideration might be `Werkzeug`.

Ciao,
Marc 'BlackJack' Rintsch
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Re: closures and dynamic binding

[jhermann]

I didn't see this mentioned in the thread yet: the double-lambda is
unnecessary (and a hack). What you should do when you need early
binding is... early binding. ;)

Namely:

f = [lambda n=n: n for n in range(10)]
print f[0]()
print f[1]()

Note the "n=n", this prints 0 and 1 instead of 9/9.
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Re: ssh keepalive

[Marc 'BlackJack' Rintsch]

On Wed, 01 Oct 2008 08:07:43 +, Lie Ryan wrote:

 a = [1, 3, 4, 2]
 a = a.sort()
 print a
> [None, None, None, None]

*That* would be really odd.  The last line should be just a singel `None` 
and not a list.  :-)

Ciao,
Marc 'BlackJack' Rintsch
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Re: ssh keepalive

[Lie Ryan]

On Wed, 01 Oct 2008 10:47:28 +, Marc 'BlackJack' Rintsch wrote:

> On Wed, 01 Oct 2008 08:07:43 +, Lie Ryan wrote:
> 
> a = [1, 3, 4, 2]
> a = a.sort()
> print a
>> [None, None, None, None]
> 
> *That* would be really odd.  The last line should be just a singel
> `None` and not a list.  :-)
> 
> Ciao,
>   Marc 'BlackJack' Rintsch

Ah yeah, I originally intended to give a list of list example, but 
changed mind and forgot to change that last line.

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Re: Eggs, VirtualEnv, and Apt - best practices?

[jhermann]

Our solution consists of:
 * our own base python distribution, decoupled from the OS one (for
various reasons, one being version independency)
 * distutils / setuptools / virtualenv is included in that python
installation, no other eggs installed in site-packages
 * virtualenv + Paver to manage build environments
 * Paver plugins containing standard (continuous) build targets
 * a hand-crafted tool that builds an RPM (.deb would be easy, too)
from an egg URL / filename, packaging a ready-to-run virtualenv
environment into the RPM; it's a rather shallow shell above virtualenv
and rpmbuild, automating the process and enforcing company standards.
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Re: closures and dynamic binding

[Paul Boddie]

On 1 Okt, 12:43, jhermann <[EMAIL PROTECTED]> wrote:
>
> f = [lambda n=n: n for n in range(10)]
> print f[0]()
> print f[1]()
>
> Note the "n=n", this prints 0 and 1 instead of 9/9.

Yes, Terry mentioned this in his response to my first message. Not
with lambdas, however, but he did state that he didn't believe that
such a distinction needed to be made clear to everyone.

Paul
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Isolated environment for execfile

[Igor Kaplan]

Hello python gurus.

  I got quite unusual problem and all my searches to find the answer on my 
own were not successful.
  Here is the scenario:
  I have the python program, let's call it script1.py, this program needs to 
execute another python script, let's call it script2.py.
  In script1.py I have the statement:
execfile('script2.py')
  Everything is fine beside one thing. The script2.py is pretty big python 
program which does a lot of things and also while runs, it modifies many 
variables and module members, such for example as sys.path. So when 
script2.py exits all changes which it does are visible in my main program, 
script1.py. Even more, I need to execute script2.py in loop, several times 
during script1.py session. And all changes, which script2.py does just 
accumulate.

  I wander, is there any way to execute script2.py in it's own environment, 
so when script2.py exits, all modifications, which it is done in global 
modules are gone?
Ideally I would love to have the following.

script1.py:
import sys
i = 10
print len(sys.path) # displays 5 for example
execfile('script2.py')
print i # still displays 10
print len(sys.path) # still displays 5

script2.py:
import sys
i += 10
sys.path.insert(0, '\\my folder')

  Sorry for such long and probably confusing message. As you probably see, I 
am not really strong python programmer and don't know advanced techniques. I 
have spent several days trying to look for the solution, the problem is, I 
even don't know what to look for. All references to execfile more talk about 
saving the environment instead of isolating it.
  Would so much appreciate any help.

  Thanks in advance.

   Igor.


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Re: Tix: Windows XP: Problem - how to stop root window from popping up with Tix

[dudeja . rajat]

On Wed, Oct 1, 2008 at 11:44 AM, Lie Ryan <[EMAIL PROTECTED]> wrote:

> On Wed, 01 Oct 2008 11:33:59 +0100, dudeja.rajat wrote:
>
> > Hi,
> >
> > Im using Tix on widows XP and I've tried many ways to suppress the root
> > window. But so far I'm unable to do it.
> >
> >
> > Please suggest how can I suppress the root window.
> >
> > My code is as follows:
> >
> > import Tix
> > myRoot = Tix.Tk()
> >
> > myRoot.withdraw()
> > myRoot.deiconify()
> >
> >
> >
> > myRoot.title("Test Automation")
> > #Create GUI Object and pass the logger object myAppGUIObject =
> > myAppGUI(myRoot, logger)   #My AppGUI class creates the GUI which
> > heavily uses the Tkinter widgets and only TixComboBox
> >
> > myRoot.mainloop()
> >
> >
> > Please suggest if there is anything I'm missing.
> >
> >
> > Thanks and regards,
> > Rajat
>
> The root window is the main window, not the DOS box. I think in windows,
> you should use pythonw.exe or something to open the python script so not
> to open a dos box.
>
> --
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>

No, even that does not help. :-(

-- 
Regards,
Rajat
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Re: Are there any python micro-frameworks (like ruby's Camping)?

[Sam]

On Oct 1, 3:42 am, Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
> On Wed, 01 Oct 2008 01:02:24 -0700, Phillip B Oldham wrote:
> > Are there any python micro-frameworks (like ruby's Camping)?
>
> Maybe `CherryPy`!?  It's the heart of other frameworks that add
> templating, ORM and the like to it.

Yeah definitely check out CherryPy.  Not sure if it's micro enough for
you, but it's pretty sweet.  ;)

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change line with columns when print

[sandric ionut]

Hello:
I have a text file that looks like:
0 23
1 342
3 31
and I want to read the file and print it out like:
0 1 3
23 342 31

How can I do this?

Thnak you in advance,

Ionut


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Re: change line with columns when print

[sandric ionut]

Thank you Almar

It worked :), I now have to format it nicely

Ionut



- Original Message 
From: Almar Klein <[EMAIL PROTECTED]>
To: python-list@python.org
Sent: Wednesday, October 1, 2008 2:57:00 PM
Subject: Re: change line with columns when print


Hi,

probably not the best solution, but this should work:

L1 = []
L2 = []
for i in file:
    tmp = i.split(" ")
    L1.append(tmp[0])
    L2.append(tmp[1])
    
for i in L1:
    print i,
print # new line
for i in L2:
    print i,
print # new line 

Almar



2008/10/1 sandric ionut <[EMAIL PROTECTED]>



Hello:
I have a text file that looks like:
0 23
1 342
3 31
and I want to read the file and print it out like:
0 1 3
23 342 31

How can I do this?

Thnak you in advance,

Ionut



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Re: parse a normal textfile

[Tino Wildenhain]

devi thapa wrote:

hi all
 
   I have one normal text file. I need to parse the file, that 
too in an associative way .

suppose that below is the normal textfile

name='adf'
id  =1
value=344



there are many approaches to config files. But
in your special example, it looks like a simplified
mapping, so

parsed=eval("dict(%s)" % ",".join(line
 for line
 in file("textfile")
 if line.strip()
 )
)

>>> parsed['name']
'adf'

but of course eval() is dangerous, so feel free to
explore more then this one solution.

Regards
Tino



smime.p7s
Description: S/MIME Cryptographic Signature
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Re: change line with columns when print

[D'Arcy J.M. Cain]

On Wed, 1 Oct 2008 04:43:34 -0700 (PDT)
sandric ionut <[EMAIL PROTECTED]> wrote:
> 
> 
> Hello:
> I have a text file that looks like:
> 0 23
> 1 342
> 3 31
> and I want to read the file and print it out like:
> 0 1 3
> 23 342 31
> 
> How can I do this?

Probably tons of ways.  Here's one with no input checking.

L = [x.strip().split() for x in open("infile") if x]
for i in range(2):
  print ' '.join([x[i] for x in L])

-- 
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http://www.druid.net/darcy/|  and a sheep voting on
+1 416 425 1212 (DoD#0082)(eNTP)   |  what's for dinner.
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Re: change line with columns when print

[Almar Klein]

Hi,

probably not the best solution, but this should work:

L1 = []
L2 = []
for i in file:
tmp = i.split(" ")
L1.append(tmp[0])
L2.append(tmp[1])

for i in L1:
print i,
print # new line
for i in L2:
print i,
print # new line

Almar


2008/10/1 sandric ionut <[EMAIL PROTECTED]>

>
> Hello:
> I have a text file that looks like:
> 0 23
> 1 342
> 3 31
> and I want to read the file and print it out like:
> 0 1 3
> 23 342 31
>
> How can I do this?
>
> Thnak you in advance,
>
> Ionut
>
>
>
>
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> http://mail.python.org/mailman/listinfo/python-list
>
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Re: change line with columns when print

[sandric ionut]

Even better,

Thank you all

Ionut



- Original Message 
From: D'Arcy J.M. Cain <[EMAIL PROTECTED]>
To: sandric ionut <[EMAIL PROTECTED]>
Cc: python-list@python.org
Sent: Wednesday, October 1, 2008 3:13:55 PM
Subject: Re: change line with columns when print

On Wed, 1 Oct 2008 04:43:34 -0700 (PDT)
sandric ionut <[EMAIL PROTECTED]> wrote:
> 
> 
> Hello:
> I have a text file that looks like:
> 0 23
> 1 342
> 3 31
> and I want to read the file and print it out like:
> 0 1 3
> 23 342 31
> 
> How can I do this?

Probably tons of ways.  Here's one with no input checking.

L = [x.strip().split() for x in open("infile") if x]
for i in range(2):
  print ' '.join([x[i] for x in L])

-- 
D'Arcy J.M. Cain <[EMAIL PROTECTED]>        |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212    (DoD#0082)    (eNTP)  |  what's for dinner.



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PyCon 2009 (US) - Call for Tutorials

[Greg Lindstrom]

The period for submitting tutorial proposals for Pycon 2009 (US) is open and
will continue through Friday, October 31th. This year features two
"pre-conference" days devoted to tutorials on Wednesday March 25 & Thursday
March 26 in Chicago. This allows for more classes than ever.

Tutorials are 3-hours long on a specific topic of your choice. Last year we
featured classes on Learning Python, Web Development, Scientific Computing,
and many more. Class size varied from 10 to over 60 students. The extended
time spent in class allows teachers to cover a lot of material while
allowing for interaction with students.

The full Call for Tutorial Proposals, including submission details, an
example proposal as well as a template, is available at <
http://us.pycon.org/2009/tutorials/proposals/>.

Tutorial selections will be announced in early December to give you time to
prepare your class and PyCon will compensate instructors US$1,500 per
tutorial.

If you have any questions, please contact [EMAIL PROTECTED]

Greg Lindstrom
Tutorial Coordinator, PyCon 2009 (US)
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Re: Tix: Windows XP: Problem - how to stop root window from popping up with Tix

[Scott David Daniels]

Lie Ryan wrote:

On Wed, 01 Oct 2008 11:33:59 +0100, dudeja.rajat wrote:
Please suggest how can I suppress the root window 
The root window is the main window, not the DOS box. I think in windows, 
you should use pythonw.exe or something to open the python script so not 
to open a dos box.


And you can accomplish this as a "clicky" by renaming your program from
"someprog.py" to "someprog.pyw".

--Scott David Daniels
[EMAIL PROTECTED]

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Re: IDLE doesn't run on OSX 10.3.9

[thomascribbs]

Just did a new install of Tcl/tk from activestate.com and IDLE still
not working...

-Tom




On Sep 30, 1:15 pm, Kevin Walzer <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > Just installed Python 2.5.2 on a PowerPC G4 running OSX 10.3.9 and
> > when clicking on the IDLE icon  in the MacPython 2.5 folder nothing
> > happens, program doesn't execute...
>
> > I've uninstalled, reinstalled over again...
>
> > I friend of mine just installed the same 2.5.2 download from the
> > Python.org website on OSX 10.4.11 and all went fine...but shouldn't it
> > install on 10.3.9 as well?
>
> > Anyone have any ideas?  Thanks.
> > -Tom
>
> Do you have Tcl/Tk installed? It doesn't come on 10.3.9 by default.
>
> --
> Kevin Walzer
> Code by Kevinhttp://www.codebykevin.com
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text file

[yqyq22]

HI all,
i have some problem with the code belove, i have a list of servers in
a textfile (elencopc.txt) i would to retrieve informations via WMI
( cicle for ), but i don't understand if the code is correct:

import win32com.client
import string
import sys
listserver = open('c:\\elencopc.txt','r')
objWMIService = win32com.client.Dispatch("WbemScripting.SWbemLocator")
objSWbemServices = objWMIService.ConnectServer(listserver,"root
\cimv2")
colItems = objSWbemServices.ExecQuery("Select * from
Win32_QuickFixEngineering")
for objItem in colItems:
print "Caption: ", objItem.Caption
print "Description: ", objItem.Description
print "Fix Comments: ", objItem.FixComments
print "HotFix ID: ", objItem.HotFixID
print "Install Date: ", objItem.InstallDate
print "Installed By: ", objItem.InstalledBy
print "Installed On: ", objItem.InstalledOn
print "Name: ", objItem.Name
print "Service Pack In Effect: ", objItem.ServicePackInEffect
print "Status: ", objItem.Status

I receive the error :
ile "C:\Python25\Lib\site-packages\win32com\client\dynamic.py", line
258, in _ApplyTypes_
result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags,
retType, argTypes) + args)
com_error: (-2147352567, 'Exception occurred.', (0, 'SWbemLocator',
'The RPC server is unavailable. ', None, 0, -2147023174), None)

MY big dubt is if the code is correct... because if i use vbscript all
works fine..
thanks a lot in advance
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Re: text file

[yqyq22]

On Oct 1, 4:03 pm, [EMAIL PROTECTED] wrote:
> HI all,
> i have some problem with the code belove, i have a list of servers in
> a textfile (elencopc.txt) i would to retrieve informations via WMI
> ( cicle for ), but i don't understand if the code is correct:
>
> import win32com.client
> import string
> import sys
> listserver = open('c:\\elencopc.txt','r')
> objWMIService = win32com.client.Dispatch("WbemScripting.SWbemLocator")
> objSWbemServices = objWMIService.ConnectServer(listserver,"root
> \cimv2")
> colItems = objSWbemServices.ExecQuery("Select * from
> Win32_QuickFixEngineering")
> for objItem in colItems:
>     print "Caption: ", objItem.Caption
>     print "Description: ", objItem.Description
>     print "Fix Comments: ", objItem.FixComments
>     print "HotFix ID: ", objItem.HotFixID
>     print "Install Date: ", objItem.InstallDate
>     print "Installed By: ", objItem.InstalledBy
>     print "Installed On: ", objItem.InstalledOn
>     print "Name: ", objItem.Name
>     print "Service Pack In Effect: ", objItem.ServicePackInEffect
>     print "Status: ", objItem.Status
>
> I receive the error :
> ile "C:\Python25\Lib\site-packages\win32com\client\dynamic.py", line
> 258, in _ApplyTypes_
>     result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags,
> retType, argTypes) + args)
> com_error: (-2147352567, 'Exception occurred.', (0, 'SWbemLocator',
> 'The RPC server is unavailable. ', None, 0, -2147023174), None)
>
> MY big dubt is if the code is correct... because if i use vbscript all
> works fine..
> thanks a lot in advance

My problem is how to translate this vbs in python:

Dim fso
Dim strComputer
Set fso = CreateObject("Scripting.FileSystemObject")
Set ElencoPC = fso.OpenTextFile("elencoPC.txt" , 1, False)
Do Until ElencoPC.AtEndOfStream
strComputer = ElencoPC.ReadLine

thanks
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Re: IDLE doesn't run on OSX 10.3.9

[Kevin Walzer]

[EMAIL PROTECTED] wrote:

Just did a new install of Tcl/tk from activestate.com and IDLE still
not working...

-Tom


Did you install Tcl/Tk 8.5? It won't work with the build of Python from 
python.org (it looks for 8.4).



--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com
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Re: Zsi interoperability

[Mailing List SVR]

Il giorno mar, 16/09/2008 alle 08.31 +0200, Mailing List SVR ha scritto:
> Il giorno lun, 15/09/2008 alle 20.26 +0200, Marco Bizzarri ha scritto:
> > On Mon, Sep 15, 2008 at 8:15 PM, Stefan Behnel <[EMAIL PROTECTED]> wrote:
> > > Mailing List SVR wrote:
> > >> I have to implement a soap web services from wsdl, the server is
> > >> developed using oracle, is zsi or some other python library for soap
> > >> interoperable with oracle soa?
> > >
> > > No idea, but I'd definitely try soaplib before ZSI.
> > >
> > > Stefan
> > 
> > I'm working on a project where I need to write a client for SOAP with
> > Attachments; I can see ZSI does not support it; is soaplib any better?
> > 
> 
> I don't need soap attachments, I have some images but are base64 encoded
> string, all other field are string, however my server require client
> certificate authentication,
> 
> does soaplib or zsi work in this environment?
> 
> is really strange that there isn't a standard and well manteined
> soap-1.2 implementation for python so we can talk without
> interoperability issue with axis2,metro,cxf,oracle,.net ecc.. :-(
> 
> thanks
> Nicola

I can confirm that zsi (2.0) works fine in my environment:

- oracle soa, as soap server
- class generation from wsdl
- several complex types
- no soap attachments (I transfer image as base64 encoded string)

regards
Nicola

> 
> > Can you argument your suggestion a little more?
> > 
> > Regards
> > Marco
> > 
> > 
> > 
> 
> --
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indirectly addressing vars in Python

[Ross]

Forgive my newbieness - I want to refer to some variables and indirectly 
 alter them.  Not sure if this is as easy in Python as it is in C.


Say I have three vars: oats, corn, barley

I add them to a list: myList[{oats}, {peas}, {barley}]

Then I want to past that list around and alter one of those values. 
That is I want to increment the value of corn:


myList[1] = myList[1] + 1

Is there some means to do that?.   Here's my little session trying to 
figure this out:


>>> oats = 1
>>> peas = 6
>>> myList=[]
>>> myList
[]
>>> myList.append(oats)
>>> myList
[1]
>>> myList.append(peas)
>>> myList
[1, 6]
>>> myList[1]= myList[1]+1
>>> myList
[1, 7]
>>> peas
6
>>>

So I don't seem to change the value of peas as I wished.  I'm passing 
the values of the vars into the list, not the vars themselves, as I 
would like.


Your guidance appreciated...

Ross.
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Peek inside iterator (is there a PEP about this?)

[Luis Zarrabeitia]

Hi there.

For most use cases I think about, the iterator protocol is more than enough. 
However, on a few cases, I've needed some ugly hacks.

Ex 1:

a = iter([1,2,3,4,5]) # assume you got the iterator from a function and
b = iter([1,2,3]) # these two are just examples.

then,

zip(a,b)

has a different side effect from

zip(b,a)

After the excecution, in the first case, iterator a contains just [5], on the 
second, it contains [4,5]. I think the second one is correct (the 5 was never 
used, after all). I tried to implement my 'own' zip, but there is no way to 
know the length of the iterator (obviously), and there is also no way 
to 'rewind' a value after calling 'next'.

Ex 2:

Will this iterator yield any value? Like with most iterables, a construct

if iterator:
   # do something

would be a very convenient thing to have, instead of wrapping a 'next' call on 
a try...except and consuming the first item.

Ex 3:

if any(iterator):
   # do something ... but the first true value was already consumed and 
   # cannot be reused. "Any" cannot peek inside the iterator without 
   # consuming the value.

Instead,

i1, i2 = tee(iterator)
if any(i1):
   # do something with i2

Question/Proposal:

Has there been any PEP regarding the problem of 'peeking' inside an iterator? 
Knowing if the iteration will end or not, and/or accessing the next value, 
without consuming it? Is there any (simple, elegant) way around it?

Cheers,

-- 
Luis Zarrabeitia (aka Kyrie)
Fac. de Matemática y Computación, UH.
http://profesores.matcom.uh.cu/~kyrie
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Re: Python script for tracert

[Thomas Guettler]

Hi,

I wrote small python only script for tcptraceroute some time ago.
This works without a subprocess:

http://www.thomas-guettler.de/scripts/tcptraceroute.py.txt

Gabriel Genellina schrieb:
En Tue, 30 Sep 2008 03:53:21 -0300, cindy jones <[EMAIL PROTECTED]> 
escribió:


Hello.. I'm trying to do a scripting for tracert  in windows using 
python...

I'm using popen(), but it displays only after the tracert is completed. i
want the results to be displayed for every route.

can anyone help me in this..


Use the subprocess module:

import subprocess
host = 'www.microsoft.com'
p = subprocess.Popen(["tracert", '-d', '-w', '100', host], 
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

while True:
line = p.stdout.readline()
if not line: break
print '-->',line,
p.wait()




--
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de
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Re: Texas Python Regional Unconference Reminders

[Travis E. Oliphant]

Travis Vaught wrote:

Greetings,

The Texas Python Regional Unconference is coming up this weekend 
(October 4-5) and I wanted to send out some more details of the 
meeting.  The web page for the meeting is here:


http://www.scipy.org/TXUncon2008

The meeting is _absolutely free_, so please add yourself to the 
Attendees page if you're able to make it.  Also, if you're planning to 
attend, please send me the following information (to 
[EMAIL PROTECTED]) so I can request wireless access for you during 
the meeting:


 - Full Name
 - Phone or email
 - Address
 - Affiliation


Travis E. Oliphant
1-512-826-7480
515 Congress Ave, Suite 2100
Enthought, Inc.

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Re: indirectly addressing vars in Python

[Jeremy Sanders]

Ross wrote:

>  >>> myList[1]= myList[1]+1

The problem is this makes myList[1] point to a new integer, and not the one
that peas points to.

Python 2.5.1 (r251:54863, Jul 10 2008, 17:25:56)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-33)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> oats=[1]
>>> peas=[6]
>>> mylist = [oats, peas]
>>> mylist[1][0] = mylist[1][0]+1
>>> mylist
[[1], [7]]
>>> peas
[7]

This is because integers are immutable, but lists are mutable.

-- 
Jeremy Sanders
http://www.jeremysanders.net/
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Re: Event-driven framework (other than Twisted)?

[Thomas Guettler]

Phillip B Oldham schrieb:

On Oct 1, 9:25 am, Lie Ryan <[EMAIL PROTECTED]> wrote:

Most GUI package use event-driven model (e.g. Tkinter).


I've noticed that. I'm thinking more for a web environment (instead of
MVC) or as a HTTP server. I know Twisted has TwistedWeb, but I'm
looking for alternatives.


Please explain what you want to do. Maybe the spread toolkit
can help you:

http://www.spread.org/index.html

HTH,
  Thomas


--
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de
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Re: indirectly addressing vars in Python

[Grant Edwards]

On 2008-10-01, Ross <[EMAIL PROTECTED]> wrote:

> Forgive my newbieness - I want to refer to some variables and
> indirectly alter them.  Not sure if this is as easy in Python
> as it is in C.

Python doesn't have variables.  It has names bound to objects.
When you do an assignment, that binds (or rebinds) a name to an
object.  There is no such thing as a C-like "variable" (a named
region of memory with a fixed location into which you can write
different values).

Some objects (e.g. lists, dictionaries) are mutable (you can
change their value or contents), some objects (e.g. strings,
integers, floats) are not mutable.

> Say I have three vars: oats, corn, barley
>
> I add them to a list: myList[{oats}, {peas}, {barley}]
>
> Then I want to past that list around and alter one of those
> values.  That is I want to increment the value of corn:
>
> myList[1] = myList[1] + 1
>
> Is there some means to do that?.  Here's my little session
> trying to figure this out:
>
> >>> oats = 1
> >>> peas = 6

Those two lines created two integer objects with values 1 and 6
and bound the names "oats" and "peas" to those two objects.

> >>> myList=[]
> >>> myList
> []
> >>> myList.append(oats)

That line finds the object to which the name "oats" is
currently bound and appends that object to the list.

> >>> myList
> [1]
> >>> myList.append(peas)

Likewise for the object to which the name "peas" is currently
bound.

> >>> myList
> [1, 6]
> >>> myList[1]= myList[1]+1

That line creates a new integer object (whose value happens to
be 7) and replaces the object at position 1 in the list with
the new object.

> >>> myList
> [1, 7]
> >>> peas
> 6
> >>>
>
> So I don't seem to change the value of peas as I wished.

Correct.  The name "peas" is still bound to the same object it
was before 

> I'm passing the values of the vars into the list, not the vars
> themselves, as I would like.

There are no "vars" as the word is used in the context of C
programming.  Just names and objects.

Here's an article explaining it:

http://rg03.wordpress.com/2007/04/21/semantics-of-python-variable-names-from-a-c-perspective/

A couple other good references:

http://starship.python.net/crew/mwh/hacks/objectthink.html
http://effbot.org/zone/python-objects.htm

-- 
Grant Edwards   grante Yow! What GOOD is a
  at   CARDBOARD suitcase ANYWAY?
   visi.com
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Re: indirectly addressing vars in Python

[Chris Rebert]

On Wed, Oct 1, 2008 at 7:53 AM, Ross <[EMAIL PROTECTED]> wrote:
> Forgive my newbieness - I want to refer to some variables and indirectly
>  alter them.  Not sure if this is as easy in Python as it is in C.
>
> Say I have three vars: oats, corn, barley
>
> I add them to a list: myList[{oats}, {peas}, {barley}]

You mean:
myList = [oats, peas, barley]

And you're not adding *variables* to a list, you're adding *values* to
the list. The list elements (and the Python runtime) have *no idea*
what variables they are/were bound to.

>
> Then I want to past that list around and alter one of those values. That is
> I want to increment the value of corn:
>
> myList[1] = myList[1] + 1

This won't do what you're expecting. Integers in Python are immutable,
so instead of changing the value of 'corn', you're calculating a new
int object and overwriting the first element of the list with it.

>
> Is there some means to do that?.   Here's my little session trying to figure
> this out:
>
 oats = 1
 peas = 6
 myList=[]
 myList
> []
 myList.append(oats)
 myList
> [1]
 myList.append(peas)
 myList
> [1, 6]
 myList[1]= myList[1]+1
 myList
> [1, 7]
 peas
> 6

>
> So I don't seem to change the value of peas as I wished.  I'm passing the
> values of the vars into the list, not the vars themselves, as I would like.
>
> Your guidance appreciated...

Python uses *call-by-object*, not call-by-value or call-by-reference
semantics, so unlike C/C++ but like Java you can't make a "reference"
to a variable and use that to non-locally rebind the variable to a new
value. To do what you want, you need to create a mutable value that
can be updated. You could code a "MutableInt" class wrapping 'int', or
you could use a dictionary to hold the values and then always refer to
the values using the dictionary. There are a few other ways to do it.

Hope that elucidates it for you somewhat. Then again I am a little
short on sleep :)

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com

>
> Ross.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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Re: How to emit UTF-8 from console mode?

[Siegfried Heintze]

>Make sure you are using the Lucida Console font for the cmd.exe window and
>type the commands:
>
>chcp 1251
>python -c "print ''.join(unichr(i) for i in range(0x410,0x431))"
>
>Output:
>
>?
>
Wowa! I was not aware of that chcp command! Thanks! How could I do that 
"chcp 1251" programatically?

The code was a little confusing because those two apostrophes look like a 
double quote!

But what are we doing here? Can you convince me that we are emitting UTF-8? 
I need UTF-8 because I need to experiment with some OS function calls that 
give me UTF-16 and I need to emit UTF-16 or UTF-8.

I think part of the problem is that Lucida Console is not as capable as 
"Arial Unicode MS" or the fonts used by urxvt-X.

Thanks,
Siegfried


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Re: change line with columns when print

[MRAB]

On Oct 1, 1:13 pm, "D'Arcy J.M. Cain" <[EMAIL PROTECTED]> wrote:
> On Wed, 1 Oct 2008 04:43:34 -0700 (PDT)
>
> sandric ionut <[EMAIL PROTECTED]> wrote:
>
> > Hello:
> > I have a text file that looks like:
> > 0 23
> > 1 342
> > 3 31
> > and I want to read the file and print it out like:
> > 0 1 3
> > 23 342 31
>
> > How can I do this?
>
> Probably tons of ways.  Here's one with no input checking.
>
> L = [x.strip().split() for x in open("infile") if x]
> for i in range(2):
>   print ' '.join([x[i] for x in L])
>
Here's another way:

rows = [line.strip().split() for line in open("infile") if line]
columns = zip(*rows)
for col in columns:
print " ".join(col)

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How to give a global variable to a function which is in a module?

[Kurda Yon]

Hi,

I would like to declare a global variable, which is seen to a
particular function. If I do as the following it works:

x = 1
def test():
  global x
  print x
  return 1

However, it does not helps since my function is in a separate file. In
other words I have a main program which has the following structure:

from test import test
x = 1
y = test()

and I have a test.py file which contains the "test" function:
def test():
  global x
  print x
  return 1

In this case the test does not see the global variable x. How can I
make the x to be visible?

Thank you.
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Re: indirectly addressing vars in Python

[Bruno Desthuilliers]

Chris Rebert a écrit :

On Wed, Oct 1, 2008 at 7:53 AM, Ross <[EMAIL PROTECTED]> wrote:

Forgive my newbieness - I want to refer to some variables and indirectly
 alter them.  Not sure if this is as easy in Python as it is in C.

Say I have three vars: oats, corn, barley

I add them to a list: myList[{oats}, {peas}, {barley}]


You mean:
myList = [oats, peas, barley]

And you're not adding *variables* to a list, you're adding *values* 


s/values/references to objects/, actually

(snip)
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Re: Event-driven framework (other than Twisted)?

[Phillip B Oldham]

On Oct 1, 4:12 pm, Thomas Guettler <[EMAIL PROTECTED]> wrote:
> Please explain what you want to do.

I'm primarily looking for alternatives to MVC frameworks for web
development, particularly SAAS. I've looked around, and some
whitepapers suggest that event-based frameworks often perform better
than MVC. Since I'm looking at SAAS, having a "view" is pretty
pointless since I'll either be using Thrift, returning simple HTTP
headers, or returning some sort of JSON/YAML/XML content (possibly
based on accept headers).
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Re: How to give a global variable to a function which is in a module?

[Bruno Desthuilliers]

Kurda Yon a écrit :

Hi,

I would like to declare a global variable, which is seen to a
particular function.


First point : there's no real 'global' scope in Python. 'global' really 
means 'module-level'.


Second point : globals are Bad(tm) anyway.


If I do as the following it works:

x = 1
def test():
  global x
  print x
  return 1


You don't even need the global statement here, since you're not 
rebinding x within the function.



However, it does not helps since my function is in a separate file. In
other words I have a main program which has the following structure:

from test import test
x = 1
y = test()


That's obviously something you *don't* want - functions depending on 
global variables that can be changed from anywhere. Ok, like any golden 
rule, this one is meant to be bypassed sometimes, but unless you fully 
understand why this is 99 times out of 100 a BadThing(tm) to do, just 
don't do it.


for the record, this would work:

import test
test.x = 42
y = test()

But once again : unless you really know what you're doing and why you're 
doing it, just don't do it.



and I have a test.py file which contains the "test" function:
def test():
  global x
  print x
  return 1

In this case the test does not see the global variable x. How can I
make the x to be visible?


Pass it to the function.

# test.py
def test(x):
   print x
   return x + 42

# main.py
from test import test
y = test(2)

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Re: Event-driven framework (other than Twisted)?

[Bruno Desthuilliers]

Phillip B Oldham a écrit :

On Oct 1, 4:12 pm, Thomas Guettler <[EMAIL PROTECTED]> wrote:

Please explain what you want to do.


I'm primarily looking for alternatives to MVC frameworks for web
development, particularly SAAS. I've looked around, and some
whitepapers suggest that event-based frameworks often perform better
than MVC. Since I'm looking at SAAS, having a "view" is pretty
pointless since I'll either be using Thrift, returning simple HTTP
headers, or returning some sort of JSON/YAML/XML content (possibly
based on accept headers).


"view" doesn't imply (x)html - any valid HTTP response is ok. The whole 
point of decoupling controler from view (in web MVC) is to allow the 
same controler to return different views.

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Re: indirectly addressing vars in Python

[Lie Ryan]

On Wed, 01 Oct 2008 10:53:08 -0400, Ross wrote:

> Forgive my newbieness - I want to refer to some variables and indirectly
>   alter them.  Not sure if this is as easy in Python as it is in C.
> 
> Say I have three vars: oats, corn, barley
> 
> I add them to a list: myList[{oats}, {peas}, {barley}]
> 
> Then I want to past that list around and alter one of those values. That
> is I want to increment the value of corn:
> 
> myList[1] = myList[1] + 1
> 
> Is there some means to do that?.   Here's my little session trying to
> figure this out:
> 
>  >>> oats = 1
>  >>> peas = 6
>  >>> myList=[]
>  >>> myList
> []
>  >>> myList.append(oats)
>  >>> myList
> [1]
>  >>> myList.append(peas)
>  >>> myList
> [1, 6]
>  >>> myList[1]= myList[1]+1
>  >>> myList
> [1, 7]
>  >>> peas
> 6
>  >>>
>  >>>
> So I don't seem to change the value of peas as I wished.  I'm passing
> the values of the vars into the list, not the vars themselves, as I
> would like.
> 
> Your guidance appreciated...
> 
> Ross.

Short answer: Python is not C.

Long answer: In python, integers are immutable (they do not change), i.e. 
if you do:
a = 1
b = 2
c = a + b
 
a + b creates a new integer object that has the value 3 and assign it to c

Other examples of immutable values are: number types, string, tuple, etc.

In python, "variable" is usually called "name". The concept of variable 
and name is slightly different.

In C, a variable contains an object. In python, a name contains a pointer 
to an object. (the term "pointer" is used a bit loosely here)

In python, a "list" is a list of pointers to objects.

i.e.:

   |--> "Hello World"
myList |--> 1
   |--> 6

when you do, for example, myList[2] + 1
what you're doing is:
1. fetch the value of myList[2] (i.e. 6)
2. do an arithmetic addition of 6 + 1
3. create a new integer object with value 7
4. bind myList[2] to that new integer object (_new integer object_ since 
integer is immutable, you cannot change its value[1])

in short, pea is left intact since pea points to integer object 6.

beware though, that things are different if myList[2] is a mutable value 
instead and the operation is an in-place operation, e.g. list.sort

>>> a = [1, 2]
>>> b = [3, 2]
>>> myList.append(a)
>>> myList.append(b)
>>> myList[1].sort()
>>> myList
[[1, 2], [2, 3]]
>>> b
[2, 3]

in this case a, b is mutable object, so:
myList.append(x) binds myList to the list object pointed by x
myList[1].sort() is an in-place sort to the list object [3, 2] (i.e. it 
mutates the list [3, 2] instead of creating a new list[1]).

in this case:

myList |--> [1, 2]
   |--> [3, 2]

myList[1].sort(), being an in-place sort, modifies the list object [3, 2] 
in-place. Since b points to the same list object, b's list is changed too.

To summarize, you don't usually use that line of thinking in python. If 
you really insists, though is not pythonic (and is really absurd anyway), 
you may use this:

>>> a = [1]
>>> b = [2]
>>> myList.append(a)
>>> myList.append(b)
>>> myList[1][0] = myList[1][0] + 1
>>> myList
[[1], [2]]
>>> b
[3]

[1] Well, not always though, in CPython (the standard python reference 
implementation), small immutable values are cached as speed optimization. 
This is a safe operation, except for identity testing. But that doesn't 
matter much, since identity testing of immutable is moot.
[2] If you want a sorting operation that returns a new list, use sorted
(list)

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string concatenate

[sandric ionut]

Hi:

I have the following situation:
    nameAll = []
    for i in range(1,10,1):
    n = "name" + str([i])
    nameAll += n
    print nameAll

I get:

['n', 'a', 'm', 'e', '[', '1', ']', 'n', 'a', 'm', 'e', '[', '2', ']', 'n', 
'a', 'm', 'e', '[', '3', ']', 'n', 'a', 'm', 'e', '[', '4', ']', 'n', 'a', 'm', 
'e', '[', '5', ']', 'n', 'a', 'm', 'e', '[', '6', ']', 'n', 'a', 'm', 'e', '[', 
'7', ']', 'n', 'a', 'm', 'e', '[', '8', ']', 'n', 'a', 'm', 'e', '[', '9', ']']

but I would like to have it as:

name1 name2 name3 ...name10

How can I do it?

Thank you,

Ionut


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Re: string concatenate

[Tommy Grav]

On Oct 1, 2008, at 12:41 PM, sandric ionut wrote:


Hi:

I have the following situation:
nameAll = []
for i in range(1,10,1):
n = "name" + str([i])
nameAll += n
print nameAll

I get:

['n', 'a', 'm', 'e', '[', '1', ']', 'n', 'a', 'm', 'e', '[', '2',  
']', 'n', 'a', 'm', 'e', '[', '3', ']', 'n', 'a', 'm', 'e', '[',  
'4', ']', 'n', 'a', 'm', 'e', '[', '5', ']', 'n', 'a', 'm', 'e',  
'[', '6', ']', 'n', 'a', 'm', 'e', '[', '7', ']', 'n', 'a', 'm',  
'e', '[', '8', ']', 'n', 'a', 'm', 'e', '[', '9', ']']


but I would like to have it as:

name1 name2 name3 ...name10

How can I do it?

Thank you,

Ionut


> nameAll = []
> for i in xrange(1,10,1):
>n = "name" + str(i)
>nameAll.append(n)
> print nameAll
['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7',  
'name8', 'name9']


list.append() is the right tool for adding new elements to a list.

Cheers
  Tommy
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Fwd: string concatenate

[Tommy Grav]

On Oct 1, 2008, at 12:41 PM, sandric ionut wrote:


Hi:

I have the following situation:
   nameAll = []
   for i in range(1,10,1):
   n = "name" + str([i])
   nameAll += n
   print nameAll

I get:

['n', 'a', 'm', 'e', '[', '1', ']', 'n', 'a', 'm', 'e', '[', '2',  
']', 'n', 'a', 'm', 'e', '[', '3', ']', 'n', 'a', 'm', 'e', '[',  
'4', ']', 'n', 'a', 'm', 'e', '[', '5', ']', 'n', 'a', 'm', 'e',  
'[', '6', ']', 'n', 'a', 'm', 'e', '[', '7', ']', 'n', 'a', 'm',  
'e', '[', '8', ']', 'n', 'a', 'm', 'e', '[', '9', ']']


but I would like to have it as:

name1 name2 name3 ...name10

How can I do it?

Thank you,

Ionut


> nameAll = []
> for i in xrange(1,10,1):
>n = "name" + str(i)
>nameAll.append(n)
> print nameAll
['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7',  
'name8', 'name9']


list.append() is the right tool for adding new elements to a list.

Cheers
 Tommy

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Re: text file

[Lie Ryan]

On Wed, 01 Oct 2008 07:19:44 -0700, yqyq22 wrote:
> My problem is how to translate this vbs in python:
> 
> Dim fso
> Dim strComputer
> Set fso = CreateObject("Scripting.FileSystemObject") Set ElencoPC =
> fso.OpenTextFile("elencoPC.txt" , 1, False) Do Until
> ElencoPC.AtEndOfStream
> strComputer = ElencoPC.ReadLine
> 
> thanks

try this:

fso = open('elencoPC.txt', 'r')
for line in f:
strComputer = line


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Re: text file

[Tim Golden]

[EMAIL PROTECTED] wrote:

HI all,
i have some problem with the code belove, i have a list of servers in
a textfile (elencopc.txt) i would to retrieve informations via WMI
( cicle for ), but i don't understand if the code is correct:



Try this, using http://timgolden.me.uk/python/wmi.html :


import wmi

#
# For the test to work
#
open ("elencopc.txt", "w").write ("localhost")

for server in open ("elencopc.txt").read ().splitlines ():
  c = wmi.WMI (server)
  print "SERVER:", server
  for item in c.Win32_QuickFixEngineering ():
print item # or print item.Caption, etc.
  print
  print



If you get RPC Server unavailable, it usually means that
the WMI service isn't running on that machine. Usually.

TJG
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Re: string concatenate

[D'Arcy J.M. Cain]

On Wed, 1 Oct 2008 09:41:57 -0700 (PDT)
sandric ionut <[EMAIL PROTECTED]> wrote:
> Hi:
> 
> I have the following situation:
>     nameAll = []
>     for i in range(1,10,1):
>     n = "name" + str([i])
>     nameAll += n
>     print nameAll
> 
> I get:
> 
> ['n', 'a', 'm', 'e', '[', '1', ']', 'n', 'a', 'm', 'e', '[', '2', ']', 'n', 
> 'a', 'm', 'e', '[', '3', ']', 'n', 'a', 'm', 'e', '[', '4', ']', 'n', 'a', 
> 'm', 'e', '[', '5', ']', 'n', 'a', 'm', 'e', '[', '6', ']', 'n', 'a', 'm', 
> 'e', '[', '7', ']', 'n', 'a', 'm', 'e', '[', '8', ']', 'n', 'a', 'm', 'e', 
> '[', '9', ']']
> 
> but I would like to have it as:
> 
> name1 name2 name3 ...name10

nameAll = ["name%d" % x for x in range(1,10,1)]

-- 
D'Arcy J.M. Cain <[EMAIL PROTECTED]> |  Democracy is three wolves
http://www.druid.net/darcy/|  and a sheep voting on
+1 416 425 1212 (DoD#0082)(eNTP)   |  what's for dinner.
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decent interactive python shell on MS Windows?

[james . kirin39]

Hi everyone,

After having used Python on Linux for some time, I now have to do
Python coding on Windows. I am big fan of the interactive Python shell
to test, eg, regexps.

Is there an interactive Python shell on Windows that supports:

- easy copy-pasting to/from an editor? (as opposed to the cumbersome
"mark", "copy" and then "paste" sequence that any terminal on Windows
seems forced to adopt)

- readline-like command history (up/down for previous/next command,
Ctr-R for searching, etc) ?

I have tried the python.org shell (difficult copy-pasting),
ActiveState's (no readline command history) and iPython (difficult
copy-pasting). Do you know of any decent interactive python shell on
Windows that comes close to the friendliness of the standard one on
Linux?

Thanks in advance

James
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Re: Fwd: string concatenate

[sandric ionut]

Thank you:
 
but I would like to have them not like:
['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7',  
'name8', 'name9']
 
but like
name1 name2 name3 name4 name5 name6 name7 name8 name9
 
Is it possible?
 
Ionut



- Original Message 
From: Tommy Grav <[EMAIL PROTECTED]>
To: Python List 
Sent: Wednesday, October 1, 2008 7:50:25 PM
Subject: Fwd: string concatenate

On Oct 1, 2008, at 12:41 PM, sandric ionut wrote:

> Hi:
>
> I have the following situation:
>    nameAll = []
>    for i in range(1,10,1):
>        n = "name" + str([i])
>        nameAll += n
>    print nameAll
>
> I get:
>
> ['n', 'a', 'm', 'e', '[', '1', ']', 'n', 'a', 'm', 'e', '[', '2',  
> ']', 'n', 'a', 'm', 'e', '[', '3', ']', 'n', 'a', 'm', 'e', '[',  
> '4', ']', 'n', 'a', 'm', 'e', '[', '5', ']', 'n', 'a', 'm', 'e',  
> '[', '6', ']', 'n', 'a', 'm', 'e', '[', '7', ']', 'n', 'a', 'm',  
> 'e', '[', '8', ']', 'n', 'a', 'm', 'e', '[', '9', ']']
>
> but I would like to have it as:
>
> name1 name2 name3 ...name10
>
> How can I do it?
>
> Thank you,
>
> Ionut

> nameAll = []
> for i in xrange(1,10,1):
>    n = "name" + str(i)
>    nameAll.append(n)
> print nameAll
['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7',  
'name8', 'name9']

list.append() is the right tool for adding new elements to a list.

Cheers
  Tommy

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Re: decent interactive python shell on MS Windows?

[Tim Golden]

[EMAIL PROTECTED] wrote:

Is there an interactive Python shell on Windows that supports:

- easy copy-pasting to/from an editor? (as opposed to the cumbersome
"mark", "copy" and then "paste" sequence that any terminal on Windows
seems forced to adopt)

- readline-like command history (up/down for previous/next command,
Ctr-R for searching, etc) ?



Yes. The Windows command shell does all these
things. To do use mouse selecting and right-click
pasting, go to the System Menu on your console and select
Properties > Options > Quick Edit Mode. You can then
use the mouse to select an area (as though on notepad)
and  to select. Likewise, already-selected text
can be right-click pasted straight in. I use this whenever
I'm posting code-samples to this list: I work them up in
a console, select-copy them out, paste them into an email,
then select-copy them back and paste into a new console
to make sure I haven't made any assumptions.

Check out the use of up/down arrows as usual, plus
F7 for history and F8 for history-completion.

It's not everyone's cup of tea but I've been using
it happily for years.

TJG
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Re: decent interactive python shell on MS Windows?

[Gary Herron]

[EMAIL PROTECTED] wrote:
> Hi everyone,
>
> After having used Python on Linux for some time, I now have to do
> Python coding on Windows. I am big fan of the interactive Python shell
> to test, eg, regexps.
>
> Is there an interactive Python shell on Windows that supports:
>
> - easy copy-pasting to/from an editor? (as opposed to the cumbersome
> "mark", "copy" and then "paste" sequence that any terminal on Windows
> seems forced to adopt)
>
> - readline-like command history (up/down for previous/next command,
> Ctr-R for searching, etc) ?
>
> I have tried the python.org shell (difficult copy-pasting),
> ActiveState's (no readline command history) and iPython (difficult
> copy-pasting). Do you know of any decent interactive python shell on
> Windows that comes close to the friendliness of the standard one on
> Linux?
>
> Thanks in advance
>
> James
> --
> http://mail.python.org/mailman/listinfo/python-list
>   

I use a window's port of
rxvt
running cygwin's bash shell.

Bash gives you all the command-history readline like capabilities, and
the rxvt window implements all the cut/past mouse actions you're used to
from Linux/Unix terminal windows.

Together, these make windows feel almost civilized.

Happy Googling for them,
Gary Herron



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Re: Fwd: string concatenate

[D'Arcy J.M. Cain]

On Wed, 1 Oct 2008 10:03:50 -0700 (PDT)
sandric ionut <[EMAIL PROTECTED]> wrote:
> Thank you:
>  
> but I would like to have them not like:
> ['name1', 'name2', 'name3', 'name4', 'name5', 'name6', 'name7',  
> 'name8', 'name9']
>  
> but like
> name1 name2 name3 name4 name5 name6 name7 name8 name9

Slight mod from my previous suggestion then.

nameAll = ' '.join(["name%d" % x for x in range(1,10,1)])

Have you gone through the tutorial yet?

-- 
D'Arcy J.M. Cain <[EMAIL PROTECTED]> |  Democracy is three wolves
http://www.druid.net/darcy/|  and a sheep voting on
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Re: Peek inside iterator (is there a PEP about this?)

[Peter Otten]

Luis Zarrabeitia wrote:

> For most use cases I think about, the iterator protocol is more than
> enough. However, on a few cases, I've needed some ugly hacks.
> 
> Ex 1:
> 
> a = iter([1,2,3,4,5]) # assume you got the iterator from a function and
> b = iter([1,2,3]) # these two are just examples.

Can you provide a concrete use case?
 
> then,
> 
> zip(a,b)
> 
> has a different side effect from
> 
> zip(b,a)
> 
> After the excecution, in the first case, iterator a contains just [5], on
> the second, it contains [4,5]. I think the second one is correct (the 5
> was never used, after all). I tried to implement my 'own' zip, but there
> is no way to know the length of the iterator (obviously), and there is
> also no way to 'rewind' a value after calling 'next'.
> 
> Ex 2:
> 
> Will this iterator yield any value? Like with most iterables, a construct
> 
> if iterator:
># do something

I don't think this has a chance. By adding a __len__ to some iterators R.
Hettinger once managed to break GvR's code. The BDFL was not amused.
 
> would be a very convenient thing to have, instead of wrapping a 'next'
> call on a try...except and consuming the first item.
> 
> Ex 3:
> 
> if any(iterator):
># do something ... but the first true value was already consumed and
># cannot be reused. "Any" cannot peek inside the iterator without
># consuming the value.

for item in iflter(bool, iterator):
   # do something
   break

is not that bad.

> Instead,
> 
> i1, i2 = tee(iterator)
> if any(i1):
># do something with i2
> 
> Question/Proposal:
> 
> Has there been any PEP regarding the problem of 'peeking' inside an
> iterator? Knowing if the iteration will end or not, and/or accessing the
> next value, without consuming it? Is there any (simple, elegant) way
> around it?

Personally I think that Python's choice of EAFP over LBYL is a good one, but
one that cannot easily be reconciled with having peekable iterators. If I
were in charge I'd rather simplify the iterator protocol (scrap send() and
yield expressions) than making it more complex.

Peter
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Re: Peek inside iterator (is there a PEP about this?)

[Lie Ryan]

On Wed, 01 Oct 2008 10:46:33 -0400, Luis Zarrabeitia wrote:

> Hi there.
> 
> For most use cases I think about, the iterator protocol is more than
> enough. However, on a few cases, I've needed some ugly hacks.
> 
> Ex 1:
> 
> a = iter([1,2,3,4,5]) # assume you got the iterator from a function and
> b = iter([1,2,3]) # these two are just examples.
> 
> then,
> 
> zip(a,b)
> 
> has a different side effect from
> 
> zip(b,a)
> 
> After the excecution, in the first case, iterator a contains just [5],
> on the second, it contains [4,5]. I think the second one is correct (the
> 5 was never used, after all). I tried to implement my 'own' zip, but
> there is no way to know the length of the iterator (obviously), and
> there is also no way to 'rewind' a value after calling 'next'.
> 
> Ex 2:
> 
> Will this iterator yield any value? Like with most iterables, a
> construct
> 
> if iterator:
># do something
> 
> would be a very convenient thing to have, instead of wrapping a 'next'
> call on a try...except and consuming the first item.
> 
> Ex 3:
> 
> if any(iterator):
># do something ... but the first true value was already consumed and
># cannot be reused. "Any" cannot peek inside the iterator without #
>consuming the value.
> 
> Instead,
> 
> i1, i2 = tee(iterator)
> if any(i1):
># do something with i2
> 
> Question/Proposal:
> 
> Has there been any PEP regarding the problem of 'peeking' inside an
> iterator? 

No (or I'm not aware of any). Why? Because for some iterable, it is not 
possible to know in advance its length (video data stream, for example), 
or whether it'd ever end (the digits of pi).

Second, in python, iterator is a use-once object, it is not designed to 
be reused. Some languages, especially the purely functional ones, allow 
multiple use of iterator because they guarantee immutability, python 
allows mutable object, and is unable to provide that.

> Knowing if the iteration will end or not, and/or accessing the
> next value, without consuming it? 

No, it is not possible to do that for some iterators. For example, this 
code:

import time
class Iterable(object):
def __iter__(self):
return self
def next(self):
return time.time()

if you peeked the iterator in advance, the result would be different 
compared to the result when you actually need it. 

> Is there any (simple, elegant) way
> around it?

Simple, but probably not that elegant, if you need such a fine control, 
use while loop.

> Cheers,
> 
> --
> Luis Zarrabeitia (aka Kyrie)
> Fac. de Matemática y Computación, UH.
> http://profesores.matcom.uh.cu/~kyrie


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Re: Isolated environment for execfile

[Lie Ryan]

On Wed, 01 Oct 2008 11:11:29 +, Igor Kaplan wrote:

> Hello python gurus.
> 
>   I got quite unusual problem and all my searches to find the answer on
>   my
> own were not successful.
>   Here is the scenario:
>   I have the python program, let's call it script1.py, this program
>   needs to
> execute another python script, let's call it script2.py.
>   In script1.py I have the statement:
> execfile('script2.py')
>   Everything is fine beside one thing. The script2.py is pretty big
>   python
> program which does a lot of things and also while runs, it modifies many
> variables and module members, such for example as sys.path. So when
> script2.py exits all changes which it does are visible in my main
> program, script1.py. Even more, I need to execute script2.py in loop,
> several times during script1.py session. And all changes, which
> script2.py does just accumulate.
> 
>   I wander, is there any way to execute script2.py in it's own
>   environment,
> so when script2.py exits, all modifications, which it is done in global
> modules are gone?
> Ideally I would love to have the following.
(snip)
>   Thanks in advance.
> 
>Igor.

I smelled a really strong sign of bad code.

1. In python, functional style programming is very much preferred. In 
short, functional style programming requires that: a function never makes 
a side-effect (python doesn't enforce this[1] as python is not a pure 
functional language).

2. In any programming language, the use of global variable must be 
minimized, and modifying global is even more frowned upon.

Aside:
If you need an isolated environment, it is probably much better if you 
use class. Each instance of a class lives separately, independent to each 
other.

e.g.:
class Test(object):
def func(self, n):
self.n = n
a = Test()
b = Test()
a.func(10)
b.func(20)
print a.n # 10
print b.n # 20

[1] in fact, many built-in standard library do use side-effects, and OOP-
style programming (more appropriately Java-style OOP) relies heavily on 
side-effect.

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Re: what does "python -i" use as input stream (stdin)?

[Almar Klein]

Hello again,
I wanted to give your solution a try, but got stuck.
The file that I want to replace the "standard input" with is a pseudo file
object with a custom read method. I have a hard time finding out how
to have a file descriptor (or fileno) associated with it.

I tried inheriting from the "file" class (using a dummy file on disk), and
then
overriding the read() and __init__() method. To test I used
os.read(my_file_no,1),
but it reads the contents of my dummy file rather than using my read method.
So obviously it does some low level stuff there...

Again I have the feeling this is impossible, but I thought that the last
time too :)

Almar

2008/9/30 Almar Klein <[EMAIL PROTECTED]>

> Wow,
> it's that easy...
> thanks!
>
> 2008/9/29 Gabriel Genellina <[EMAIL PROTECTED]>
>
> En Fri, 26 Sep 2008 04:29:42 -0300, Almar Klein <[EMAIL PROTECTED]>
>> escribió:
>>
>>  I would still like to hear if anyone knows how I can change the input
>>> stream
>>> that
>>> is used when running "python -i", but I would not be surprised if it is
>>> impossible...
>>>
>>
>> Sure you can. You have to replace the file descriptor 0, that is,
>> "standard input"; sys.stdin reads from there. The standard way is to use
>> os.dup2:
>>
>> c:\temp>type foo.txt
>> This line read from foo.txt
>>
>>
>> c:\temp>type redirect.py
>> import os
>>
>> inp = open("foo.txt","r")
>> os.dup2(inp.fileno(), 0)
>> print "raw_input->", raw_input()
>>
>> c:\temp>python redirect.py
>> raw_input-> This line read from foo.txt
>>
>> This is not
>>
>>
>> --
>> Gabriel Genellina
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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Re: parse a normal textfile

[Lie Ryan]

On Wed, 01 Oct 2008 14:09:09 +0200, Tino Wildenhain wrote:

> devi thapa wrote:
>> hi all
>>  
>>I have one normal text file. I need to parse the file, that
>> too in an associative way .
>> suppose that below is the normal textfile
>> 
>> name='adf'
>> id  =1
>> value=344
>> 
>> 
> there are many approaches to config files. But in your special example,
> it looks like a simplified mapping, so
> 
> parsed=eval("dict(%s)" % ",".join(line
>   for line
>   in file("textfile")
>   if line.strip()
>   )
>  )
> 
>  >>> parsed['name']
> 'adf'
> 
> but of course eval() is dangerous, so feel free to explore more then
> this one solution.
> 
> Regards
> Tino

There is no need to use eval on that, you could just use:

f = open('file.conf')
conf = {}
for line in f:
key, value = line.split('=', 1)
conf[key] = value

a bit more obscure:

conf = dict(line.split('=', 1) for line in open('file.conf'))

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   Registered at Amtsgericht Duesseldorf: HRB 46611


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Re: Event-driven framework (other than Twisted)?

[Lie Ryan]

On Wed, 01 Oct 2008 18:09:20 +0200, Bruno Desthuilliers wrote:

> Phillip B Oldham a écrit :
>> On Oct 1, 4:12 pm, Thomas Guettler <[EMAIL PROTECTED]> wrote:
>>> Please explain what you want to do.
>> 
>> I'm primarily looking for alternatives to MVC frameworks for web
>> development, particularly SAAS. I've looked around, and some
>> whitepapers suggest that event-based frameworks often perform better
>> than MVC. Since I'm looking at SAAS, having a "view" is pretty
>> pointless since I'll either be using Thrift, returning simple HTTP
>> headers, or returning some sort of JSON/YAML/XML content (possibly
>> based on accept headers).
> 
> "view" doesn't imply (x)html - any valid HTTP response is ok. The whole
> point of decoupling controler from view (in web MVC) is to allow the
> same controler to return different views.

In fact, MVC and event-driven is two entirely different concept. You can 
have both, or none. It is, in the end, your choice which one to use or 
whether you want to use both or none.

Event-driven programming is a concept that your programs are entirely 
composed of function definition and binding that function definition to 
events. The rest is handled by a mainloop, which calls the appropriate 
functions when it receives something.

MVC is a separation of concern. In MVC code you want that there is a 
clear boundary between code that handles Model, View, and Controller, so 
it'd be easier to manage the code.

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Re: problem with "ImportError: No module named..." and sockets

[Daniel]

On Sep 30, 5:49 pm, "Gabriel Genellina" <[EMAIL PROTECTED]>
wrote:
> En Tue, 30 Sep 2008 19:44:51 -0300, Daniel <[EMAIL PROTECTED]>  
> escribió:
>
>
>
> > On Sep 30, 4:17 pm, "Gabriel Genellina" <[EMAIL PROTECTED]>
> > wrote:
> >> En Tue, 30 Sep 2008 18:38:19 -0300, Daniel <[EMAIL PROTECTED]>  
> >> escribió:
>
> >> > [BEGIN CODE]
> >> > #!/usr/bin/python
> >> > import SocketServer
> >> > import os, sys
> >> > newpath = os.path.normpath( os.path.join( __file__, "../../.." ))
> >> > sys.path.insert(0, newpath)
>
> >> > from pop.command.UpdateCommand import *
> >> > import cPickle
>
> >> > Traceback (most recent call last):
> >> > [...]
> >> > ImportError: No module named UpdateCommand
>
> >> > I import the module at the top of the file server.py, but it doesn't
> >> > throw the ImportError until it tries to unpickle.
>
> >> Notice that you don't import the UpdateCommand module - you import all  
> >> names defined inside it instead. It's not the same thing.
> >> Seehttp://effbot.org/zone/import-confusion.htm
>
> >> --
> >> Gabriel Genellina
>
> > Thank you Gabriel,
>
> > The class inside that module has the same name, UpdateCommand.  Since
> > this is the object that was pickled, it should be available to the
> > unpickle command.  I already understood the difference between import
> > methods and I think I'm covered.  I did just try "import
> > pop.command.TesterUpdateCommand" instead and I get the same error.
>
> (TesterUpdateCommand != UpdateCommand...)
>
> In your *pickling* code, just before pickling the object, see what you get  
>  from this:
>
>          cls = obj.__class__
>          print cls.__module__
>          print cls.__name__
>
> Suppose you get "SomeModuleName" and "SomeClassName". Then, in your  
> *unpickling* environment, this must succeed:
>
>          import SomeModuleName
>          cls = SomeModuleName.SomeClassName
>
> If not, you should rearrange things (on both sides, probably) to make the  
> reference work. This is basically what pickle does.
>
> Looks like the module lives in a package - make sure you import the  
> *package* both when pickling and unpickling. The sys.path manipulation  
> looks suspicious.
>
> --
> Gabriel Genellina

This turned out to be a problem with PyScripter.  When I open the same
files in Komodo they work fine.

Sorry for the trouble.
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Re: How to emit UTF-8 from console mode?

[Lie Ryan]

On Wed, 01 Oct 2008 08:17:15 -0700, Siegfried Heintze wrote:

(snip)

> The code was a little confusing because those two apostrophes look like
> a double quote!

Tips: use mono-spaced font. There is no ambiguity.
 
(snip)
 
> I think part of the problem is that Lucida Console is not as capable as
> "Arial Unicode MS" or the fonts used by urxvt-X.
> 
> Thanks,
> Siegfried

Why don't you write it to a file? Then open that file from Notepad

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Re: Event-driven framework (other than Twisted)?

[John Krukoff]

You could take a look at this interesting looking server that popped up
on the mailing list a while back:

http://code.google.com/p/yield/

On Wed, 2008-10-01 at 01:01 -0700, Phillip B Oldham wrote:
> Are there any python event driven frameworks other than twisted?
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-- 
John Krukoff <[EMAIL PROTECTED]>
Land Title Guarantee Company

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Re: decent interactive python shell on MS Windows?

[David]

Il Wed, 1 Oct 2008 09:53:48 -0700 (PDT), [EMAIL PROTECTED] ha scritto:

> Is there an interactive Python shell on Windows that supports:
> 
> - easy copy-pasting to/from an editor? (as opposed to the cumbersome
> "mark", "copy" and then "paste" sequence that any terminal on Windows
> seems forced to adopt)

1) Right mouse button on the link to open a command shell
2) select the tab Options
3) in the box Edit Options, check the Rapid Edit Mode
4) click OK

Now you can use the left mouse button to highlight a portion of the shell
and the right button to paste it.

> 
> - readline-like command history (up/down for previous/next command,
> Ctr-R for searching, etc) ?

Idle or (better) iPython. The copy/paste 'problem' is solved above.

D.
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Re: closures and dynamic binding

[Aaron "Castironpi" Brady]

On Oct 1, 5:43 am, jhermann <[EMAIL PROTECTED]> wrote:
> I didn't see this mentioned in the thread yet: the double-lambda is
> unnecessary (and a hack). What you should do when you need early
> binding is... early binding. ;)
>
> Namely:
>
> f = [lambda n=n: n for n in range(10)]
> print f[0]()
> print f[1]()
>
> Note the "n=n", this prints 0 and 1 instead of 9/9.

Yes it was mentioned earlier.  I think its similar.  They both create
ten new namespaces.  You could do something like this (I hit a bump
with eval and globals() when I tried it):

def early( string ):
   return eval( string, current_namespace )

f = [early( 'lambda: n' ) for n for n in range(10)]
print f[0]()
print f[1]()

Furthermore, I don't think the binding semantics of the language are
completely static binding.  What does that definition say about
mutating a value?  I think it's ambiguous and there's no obvious use
case that favors either one.
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Re: string concatenate

[Lie Ryan]

On Wed, 01 Oct 2008 09:41:57 -0700, sandric ionut wrote:

> Hi:
> 
> I have the following situation:
>     nameAll = []
Here you defined nameAll as a list

>     for i in range(1,10,1):
That range is superfluous, you could write this instead[1]:
for i in range(10):

>     n = "name" + str([i])

in this, you're converting a list into a string. If i was 2, the 
conversion result into: 'name' + '[2]'

>     nameAll += n
Here you're appending n into the list nameAll. Python's string behaves 
like a list, that it is iterable, so list accepts it.

>     print nameAll

your code should be:
listAll = []
for i in range(1, 11):
n = "name" + str(i)
listAll.append(n)
print ' '.join(listAll)

or using list comprehension and string interpolation:
print ' '.join('name%s' % i for i in range(1, 11))

[1] Note that range(10) starts with 0, and produces a list of 10 numbers. 
If, like in your expected result, you want name1 till name10, you'll need 
range(1, 11) because range is half-open, it includes 1, but not 11. This 
behavior has some unique property that simplifies many things, although 
it do takes some time to get used to.

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Re: What is not objects in Python?

[Aaron "Castironpi" Brady]

On Sep 30, 7:39 am, Steve Holden <[EMAIL PROTECTED]> wrote:
> Steven D'Aprano wrote:
> > On Mon, 29 Sep 2008 21:03:07 -0700, namekuseijin wrote:
>
> >>> Why isn't len implemented as a str.len and list.len method instead of a
> >>> len(list) function?
> >> Because postfix notation sucks.  The natural way of spelling is
> >> adjective+noun and verb+predicate.
>
> > "Natural"?
>
> > You mean phrases like "heir apparent" and "worst choice imaginable" are
> > unnatural?
>
> They are certainly far from normal usage, as my dog yellow would be
> certain to agree.
>
> > To say nothing of languages like Spanish, Albanian, Italian,
> > Cornish, Vietnamese, Hebrew...
>
> It's long been a convention in the Western programming world to pretend
> no other language than English and no other codes than ASCII exist.
>
> The fact that Python is beginning to come to terms with Unicode is a
> tribute to certain developers' persistence.
>
> regards
>  Steve
> --
> Steve Holden        +1 571 484 6266   +1 800 494 3119
> Holden Web LLC              http://www.holdenweb.com/

How do you have a yellow dog, and what does s/he know about natural
noun-verb usage?
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Re: Peek inside iterator (is there a PEP about this?)

[George Sakkis]

On Oct 1, 10:46 am, Luis Zarrabeitia <[EMAIL PROTECTED]> wrote:

> Hi there.
>
> For most use cases I think about, the iterator protocol is more than enough.
> However, on a few cases, I've needed some ugly hacks.
>
> Ex 1:
>
> a = iter([1,2,3,4,5]) # assume you got the iterator from a function and
> b = iter([1,2,3]) # these two are just examples.
>
> then,
>
> zip(a,b)
>
> has a different side effect from
>
> zip(b,a)
>
> After the excecution, in the first case, iterator a contains just [5], on the
> second, it contains [4,5]. I think the second one is correct (the 5 was never
> used, after all). I tried to implement my 'own' zip, but there is no way to
> know the length of the iterator (obviously), and there is also no way
> to 'rewind' a value after calling 'next'.
>
> Ex 2:
>
> Will this iterator yield any value? Like with most iterables, a construct
>
> if iterator:
># do something
>
> would be a very convenient thing to have, instead of wrapping a 'next' call on
> a try...except and consuming the first item.
>
> Ex 3:
>
> if any(iterator):
># do something ... but the first true value was already consumed and
># cannot be reused. "Any" cannot peek inside the iterator without
># consuming the value.
>
> Instead,
>
> i1, i2 = tee(iterator)
> if any(i1):
># do something with i2
>
> Question/Proposal:
>
> Has there been any PEP regarding the problem of 'peeking' inside an iterator?
> Knowing if the iteration will end or not, and/or accessing the next value,
> without consuming it? Is there any (simple, elegant) way around it?

Testing for an empty iterator: http://code.activestate.com/recipes/413614/

There also used to be a more general recipe at the Cookbook but it
seems it has not made it to the revamped site. Thanks to the web
archive, here's a link:
http://web.archive.org/web/20060529065931/http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/304373

HTH,
George
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