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Re: Is Python a commercial proposition ?

2012-07-29 Thread Bernd Waterkamp
Michael Hrivnak schrieb:

> Python is used frequently on the server side of web applications for
> sites of all sizes, with the UI generally being done in javascript.

Two large companies with lots of python code are dropbox and youtube:

http://highscalability.com/blog/2011/3/14/6-lessons-from-dropbox-one-million-files-saved-every-15-minu.html
http://highscalability.com/blog/2012/3/26/7-years-of-youtube-scalability-lessons-in-30-minutes.html

> It's also used heavily for administrative purposes such as:
> 
> - Operating system installer: http://fedoraproject.org/wiki/Anaconda
> - Software repository management: http://pulpproject.org/
> - Software package installation:
> http://en.wikipedia.org/wiki/Ubuntu_Software_Center
> - Cloud computing: http://en.wikipedia.org/wiki/OpenStack

- Frameworks/tools like func, fabric or ipython are used in medium and
large networks/"clouds". 
- Python is also used a lot for admin tasks instead of shell scripts. 
- I know IBM WebSphere is not the favorite choice as an application server
for most Java programmers *g*, but it uses Jython for the admin CLI. 

python and python based tools are used for engineering and scientific
computing - some random examples: numpy, Sage, matplotlib, NetworkX. 

Regards, 
Bernd
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Re: Arithmetic with Boolean values

2012-08-12 Thread Bernd Nawothnig
On 2012-08-12, Paul Rubin wrote:
>> which can be simplified to:
>> for x in range(len(L)//2 + len(L)%2):
>
> for x in range(sum(divmod(len(L), 2))): ...

nice solution.



Bernd

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Re: Appending to []

2012-04-21 Thread Bernd Nawothnig
On 2012-04-20, Rotwang wrote:
> since a method doesn't assign the value it returns to the instance on 
> which it is called; what it does to the instance and what it returns are 
> two completely different things.

Returning a None-value is pretty useless. Why not returning self, which would be
the resulting list in this case? Returning self would make the
language a little bit more functional, without any drawback.

Then nested calls like

a = [].append('x').append('y').append('z')

would be possible with a containing the resulting list

['x', 'y', 'z'].

That is the way I expect any append to behave.




Bernd

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Re: why () is () and [] is [] work in other way?

2012-04-21 Thread Bernd Nawothnig
On 2012-04-20, dmitrey wrote:
> I have spent some time searching for a bug in my code, it was due to
> different work of "is" with () and []:
>>>> () is ()
> True

You should better not rely on that result. I would consider it to be
an implementation detail. I may be wrong, but would an implementation
that results in

() is () ==> False

be correct or is the result True really demanded by the language
specification?

>>>> [] is []
> False

Same for that.

>
> (Python 2.7.2+ (default, Oct  4 2011, 20:03:08)
> [GCC 4.6.1] )
>
> Is this what it should be or maybe yielding unified result is better?

See above.




Bernd

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Re: Appending to []

2012-04-21 Thread Bernd Nawothnig
On 2012-04-21, Kiuhnm wrote:
>> Returning a None-value is pretty useless. Why not returning self, which 
>> would be
>> the resulting list in this case? Returning self would make the
>> language a little bit more functional, without any drawback.

>>
>> Then nested calls like
>>
>> a = [].append('x').append('y').append('z')
>
> You just answered to your own question: append returns None so that 
> people can't use it the way you did.

That is one possible way to design the method, but not the only
possible way.

> You make the reader believe that you're adhering to the functional 
> paradigm whereas 'append' has actually side effects!
> Moreover, you use an assignment just to reinforce this wrong belief.

I know about side effects and I know that letting append return self
would not make Python a purely functional language with only immutable
data.

I just asked a simple question about a detail I personally would
consider it to be useful.

Please no further religious war about that ;-)




Bernd

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Re: Appending to []

2012-04-21 Thread Bernd Nawothnig
On 2012-04-21, Kiuhnm wrote:
> Sorry if I wasn't clear. I meant that one should either relies on 
> side-effects and write something like
>a.append('x').append('t').append('z')
> or use a more functional style and write
>a = a + [x] + [z]
> Mixing the two doesn't seem very elegant to me.
> I also think that if you need to repeatedly modify an object in the same 
> expression, then you should prefer the more functional approach.
> I wasn't suggesting that you didn't know what functional programming and 
> side effects are.
> Mine was a justification (maybe opinable) of why append was designed 
> that way.

Ok, understood and accepted 



Bernd

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Re: why () is () and [] is [] work in other way?

2012-04-21 Thread Bernd Nawothnig
On Sat, Apr 21, 2012 at 03:43:03PM -0400, Dave Angel wrote:
> On 04/21/2012 09:48 AM, Bernd Nawothnig wrote:
> > On Sat, Apr 21, 2012 at 09:21:50AM -0400, Dave Angel wrote:
> >>>>>>> [] is []
> >>>> False
> >>> Same for that.
> >>
> >> Here I have to disagree.  If an implementation reused the list object
> >> for two simultaneously-existing instances, it would violate first
> >> principles.
> > 
> > Hm.
> > 
> > Even if there is no chance to reach any of these two lists after the
> > comparison because *no* references to them exist and both *must* be
> > identical because they are both noted as the same literals?
> > 
> > If any references exist, no question, that is pretty clear and
> > understandable. But in that special case?
> > 
> 
> You forgot to CC the list on your two messages to me.

Sorry, I'm reading the list via usenet gateway. Hopefully it works now.
 
> Clearly, False has to be a valid return result.  So I assume your
> question is why shouldn't an implementation be permitted to return True,
> in other words why couldn't it be ambiguous, like the immutable case.

Yes.
 
> Why would you (a hypothetical compiler writer) write an optimizer to
> look for such a special case like this, when the code would probably
> never appear in a real program, and certainly not in a performance
> critical portion of one.
> And if you did write one, why would you have it produce a different
> result than the non-optimized version?  Why not have it return 42 if
> that's the goal?

My original statement was: don't rely on such behaviour, it is an
implementation detail.

Your argument above was: it would violate first principles. And I still don't
see that point. The comparison [] is [] maybe totally useless, of course, but
which first principle would be violated by a compiler that lets that
expression evaluate to True?

Where can I read that the result *must* be False?

Otherwise it is simply an ambigious and not clearly defined expression like

() is ()





Bernd
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Re: Appending to []

2012-04-22 Thread Bernd Nawothnig
On 2012-04-22, Steven D'Aprano wrote:
> On Sat, 21 Apr 2012 14:48:44 +0200, Bernd Nawothnig wrote:
>
>> On 2012-04-20, Rotwang wrote:
>>> since a method doesn't assign the value it returns to the instance on
>>> which it is called; what it does to the instance and what it returns
>>> are two completely different things.
>> 
>> Returning a None-value is pretty useless. Why not returning self, which
>> would be the resulting list in this case? Returning self would make the
>> language a little bit more functional, without any drawback.
>
> It is a deliberate design choice, and there would be a drawback.
>
> A method like append could have three obvious designs:
>
> 1) Functional, no side-effects: return a new list with the item appended.
>
> 2) Functional, with side-effect: return the same list, after appending 
> the item.
>
> 3) Procedural, with side-effect: append the item, don't return anything 
> (like a procedure in Pascal, or void in C).

Correct.

> Python chooses 3) as the design, as it is the cleanest, most pure choice 
> for a method designed to operate by side-effect. Unfortunately, since 
> Python doesn't have procedures, that clean design is slightly spoilt due 
> to the need for append to return None (instead of not returning anything 
> at all).
>
> How about 1), the pure functional design? The downside of that is the 
> usual downside of functional programming -- it is inefficient to 
> duplicate a list of 100 million items just to add one more item to that 
> list.

In general I always prefer the pure functional approach. But you are
right, if it is too costly, one has to weigh the pros and contras.

> Besides, if you want a pure functional append operation, you can 
> simply use mylist + [item] instead.

That ist true. I will keep that in mind :-)

> But what about 2), the mixed (impure) functional design? Unfortunately, 
> it too has a failure mode: by returning a list, it encourages the error 
> of assuming the list is a copy rather than the original:
>
> mylist = [1, 2, 3, 4]
> another_list = mylist.append(5)
> # many pages of code later...
> do_something_with(mylist)

Yes, but mutable data is in general a candidate for unexpected
behaviour, regardless wether you use an impure functional notation or
not:

mylist = [1, 2, 3, 4]
mylist.append(5)
another_list = mylist
# many pages of code later...
do_something_with(mylist)

avoids that impure function call but can perfectly lead to the same
unexpected behaviour. Your "many pages of code later" and that it is
simply difficult or impossible to keep in mind all these possible
state changes of variables is the real problem here.

> This is especially a pernicious error because instead of giving an 
> exception, your program will silently do the wrong thing. 
>
> "I find it amusing when novice programmers believe their main
> job is preventing programs from crashing. More experienced
> programmers realize that correct code is great, code that 
> crashes could use improvement, but incorrect code that doesn’t 
> crash is a horrible nightmare."
> -- Chris Smith

Absolutely corrrect!

> Debugging these sorts of bugs can become very difficult, and design 2) is 
> an attractive nuisance: it looks good because you can chain appends:
>
> mylist.append(17).append(23).append(42)
> # but why not use mylist.extend([17, 23, 42]) instead?
>
> but the disadvantage in practice far outweighs the advantage in theory.
>
> This is the same reason why list.sort, reverse and others also return 
> None.

Yeah, understood.

>> Then nested calls like
>> 
>> a = [].append('x').append('y').append('z')
>> 
>> would be possible with a containing the resulting list
>> 
>> ['x', 'y', 'z'].
>> 
>> That is the way I expect any append to behave.
>
> That would be possible, but pointless. Why not use:
>
> a = ['x', 'y', 'z'] 
>
> directly instead of constructing an empty list and then make three 
> separate method calls? Methods which operate by side-effect but return 
> self are an attractive nuisance: they seem like a good idea but actually 
> aren't, because they encourage the user to write inefficient, or worse, 
> incorrect, code.

In the past I often wrote methods that returned self instead of void,
None, or Nil depending on the used language. 

But your arguments against that are not bad.

Thanks!

Instead of thinking about impure designs I should dig deeper into
Haskell :-)




Bernd

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Re: why () is () and [] is [] work in other way?

2012-04-23 Thread Bernd Nawothnig
On 2012-04-23, Paul Rubin wrote:
> Kiuhnm  writes:
>> I can't think of a single case where 'is' is ill-defined.
>
> If I can't predict the output of 
>
> print (20+30 is 30+20)  # check whether addition is commutative
> print (20*30 is 30*20)  # check whether multiplication is commutative
>
> by just reading the language definition and the code, I'd have to say
> "is" is ill-defined.

"is" was never designed for comparing literals or expressions.

the expression 

20+30 is 30+20

maybe syntactically correct but is nevertheless pretty senseless and
you can, of course, not check commutativity with it.

For checking commutativity you have to use:

20+30 == 30+20

>
>> You're blaming 'is' for revealing what's really going on. 'is' is
>> /not/ implementation-dependent. It's /what's going on/ that's
>> implementation-dependent.
>> "a is b" is true iff 'a' and 'b' are the same object. Why should 'is'
>> lie to the user?
>
> Whether a and b are the same object is implementation-dependent.

>>> a = something
>>> b = a
>>> a is b
True

Should be guaranteed and implementation-independent.




Bernd

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Re: Detect Linux Runlevel

2016-12-05 Thread Bernd Nawothnig
On 2016-12-05, Wildman wrote:
> And I am trying to write it without using external programs, where
> possible.

That is not the Unix way.

> I am a hobby programmer and I've been trying to learn python
> for a few months now.  The program is 'worthlessware' but it
> is a 'learning experience' for me.  

It looks for me like a worthless learning experience.

> A friend wrote a similar program in Bash script and I have been
> working on translating it to Python.

Stay with shell script for such tasks. It is never a good idea to
choose the programming language before closer evaluating the problem.




Bernd

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Re: topology rules in python

2016-12-20 Thread Bernd Nawothnig
On 2016-12-20, Xristos Xristoou wrote:
> I have a PostGIS database with shapefiles lines, polygons and points
> and I want to create a topology rules with python. Any idea how to do
> that ?some packages ?

http://www.gdal.org/

or:

pip install gdal




Bernd

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Re: Python slang

2016-08-06 Thread Bernd Nawothnig
On 2016-08-06, Chris Angelico wrote:
> On Sat, Aug 6, 2016 at 11:14 AM, Steven D'Aprano
> wrote:
>>> I don't ask about `None` instead of `null` because I suppose here it's
>>> a matter of disambiguation (null, in many languages, is not equal to
>>> null).
>>
>> Really? Which languages? That's not true in Pascal, C, Ruby or
>> Javascript.
>>
>
> SQL (shown here with PostgreSQL's CLI):
>
> rosuav=> \pset null NULL
> Null display is "NULL".
> rosuav=> select NULL = NULL;
>  ?column?
> --
>  NULL
> (1 row)
>
> But SQL's NULL is a cross between C's NULL, IEEE's NaN, Cthulhu, and
> Emrakul.

SQL NULL has the semantic of "unknown". So if one or both operands of
a comparison (or any other operation) are unknown the result is
unknown too. And that means NULL.

That is also the reason why you have the keyword STRICT when declaring
a function in PostgreSQL. If only one parameter of the function is
NULL and the result depends directly on the parameter the planner can
then automatically skip the function call completely und replace the
result by NULL without any need to analyse or enter the function body.




Bernd

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Re: Python slang

2016-08-07 Thread Bernd Nawothnig
On 2016-08-06, Chris Angelico wrote:
> On Sun, Aug 7, 2016 at 5:37 AM, Bernd Nawothnig
> wrote:
>>> But SQL's NULL is a cross between C's NULL, IEEE's NaN, Cthulhu, and
>>> Emrakul.
>>
>> SQL NULL has the semantic of "unknown". So if one or both operands of
>> a comparison (or any other operation) are unknown the result is
>> unknown too. And that means NULL.
>
> That's not entirely accurate, and it doesn't explain why NULL
> sometimes behaves as if it's a genuine value, and sometimes as if it's
> completely not there. For instance, taking the average of a column of
> values ignores NULLs completely, and COUNT(column) is the same as
> COUNT(column) WHERE column IS NOT NULL; but in some situations it
> behaves more like NaN:
>
> rosuav=> select null or true, null or false, null and true, null and false;
>  ?column? | ?column? | ?column? | ?column?
> --+--+--+--
>  t| NULL | NULL | f
> (1 row)
>
> Anything "or true" has to be true, so NULL OR TRUE is true. And then
> there are the times when NULL acts like a completely special value,
> for instance in a foreign key - it means "there isn't anything on the
> other end of this relationship", and is perfectly legal. Or in a
> SELECT DISTINCT, where NULL behaves just like any other value - if
> there are any NULL values in the column, you get back exactly one NULL
> in the result.

Thanks for that additions and corrections.




Bernd

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new to python - like to write a script with the libvirt-python 5.3.0 package

2019-06-03 Thread Lentes, Bernd
Hello dear Python-community,

i'm pretty new to Python. I made a seminar two weeks ago and like to write now 
a script because if i don't i will have forgotten everything in a few weeks.
If this is the wrong place to ask my question please tell me where is the 
appropriate one.
I'm a Sysadmin, not a software developer. 
We are running a two-node High Availibility cluster on SLES 12 SP4 with virtual 
machines on it.
I wrote a shellscript to create consistent images of the virtual machines each 
night, using the bash and virsh (the libvirt shell).
Script is running fairly fine, but i need to extend it.
I'm thinking of rewriting it in python, i think that would be a good practise.
Inside the script i'm using things like "virsh start, virsh shutdown, virsh 
snaphot-list, virsh snapshot, virsh snapshot-delete, virsh domblklist, virsh 
blockcommit, virsh list, virsh define ..."
Can i use all the possibilities i have in virsh in that libvirt-package ?

I'm also creating logfiles, deleting files, sending e-Mails, redirecting stdout 
and stderr.
This shouldn't be a problem in Python ?

Thanks.


Bernd


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Re: Tkinter vs wxPython

2004-12-29 Thread Bernd Schmidt
Thomas Bartkus schrieb:
When run under Linux, my wxPython programs follow the look and feel of my
Gnome desktop.  When the same program is run on Windows, it follows that
desktop theme. Both Gnome and Windows XP alter the the controls design
according to user preferences.  wxPython GUIs reflect this automatically and
the controls always look and work like the underlying system.
Sure, but on my Linux, I use KDE, never Gnome, other people use 
Windowmaker or something else. wxPython with KDE-Look? What is the 
native look with wxPython and KDE? I don't think there is something like 
this, and the problem is that there isn't a free QT on Windows.

Bernd
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Re: Reading csv file

2013-12-17 Thread Bernd Nawothnig
On 2013-12-17, Igor Korot wrote:
> Hi, ALL,
> Is there a better way to do that:
>
> def Read_CSV_File(filename):
>   file = open(filename, "r")
>   reader = csv.DictReader(file)
>   line = 1
>   for row in reader:
>   if line < 6:
>  reader.next()
>  line++
> # process the CSV

#v+
def Read_CSV_File(filename):
with open(filename) as f:
for line,row in enumerate(csv.DictReader(f)):
if line >= 6:
# process the CSV
#v-




Bernd

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Re: Remove comma from tuples in python.

2014-02-20 Thread Bernd Nawothnig
On 2014-02-21, Mircescu Andrei wrote:
> vineri, 21 februarie 2014, 08:49:01 UTC+2, Jaydeep Patil a scris:
>> I am getting below tuple from excel.
>> 
>> How should i remove extra commas in each tuple to make it easy for 
>> operations.
>> 
>> 
>> 
>> tuples is:
>> 
>> seriesxlist1 = ((0.0), (0.01), (0.02), (0.03), (0.04), (0.05), (0.06), 
>> (0.07), (0.08), (0.09), (0.1), (0.11))
>
> i think you have a tuple of tuples there. a tuple of 12 tuples.

No it isn't:

#v+
>>> a = ((0.0), (0.01), (0.02), (0.03), (0.04), (0.05), (0.06), (0.07), (0.08), 
>>> (0.09), (0.1), (0.11))
>>> a
(0.0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11)
#v-

The comma makes a tuple, not the parenthesis alone:


#v+
>>> a = ((0.0,), (0.01,), (0.02,), (0.03,), (0.04,), (0.05,), (0.06,), (0.07,), 
>>> (0.08,), (0.09,), (0.1,), (0.11,))
>>> a
((0.0,), (0.01,), (0.02,), (0.03,), (0.04,), (0.05,), (0.06,), (0.07,), 
(0.08,), (0.09,), (0.1,), (0.11,))
>>> 
#v-




Bernd

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Re: why indentation should be part of the syntax

2014-03-02 Thread Bernd Nawothnig
On 2014-03-02, Stefan Behnel wrote:
> Haven't seen any mention of it on this list yet, but since it's such an
> obvious flaw in quite a number of programming languages, here's a good
> article on the recent security bug in iOS, which was due to accidentally
> duplicated code not actually being as indented as it looked:
>
> https://www.imperialviolet.org/2014/02/22/applebug.html

The way Perl or Go handles it where it is not possible to omit the
curly braces would have prevented the same error too.




Bernd

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Re: CentOS 6.5 / SPEC file

2014-03-28 Thread Bernd Waterkamp
Michael Torrie schrieb:

> I should add, that the only correct way to package Python 3 on RHEL 6 is
> by making the package called "python3" or something that won't collide
> with the system Python 2.x package.  

Another option for Fedora and RHEL6: Software Collections 

http://developerblog.redhat.com/2014/02/18/migrate-to-python3-w-rhscl/
https://fedorahosted.org/SoftwareCollections/
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Re: problem in event handling on change of variable value.

2014-04-17 Thread Bernd . Moennicke
hello sirjee,

i have read You solution for handling of events from CANoe in python.

I've implemented and its work correctly when I waiting in a msgbox (0, 
"Finished the Test", "Info", 16).
I will implement it in a loop with a sleep time. The standard python 
function of the sleep blocks the actual task and the event handling dosn't 
work.

Now I search for a solution to start the event class in a extra task with 
treahding.Thread. 

I've write a simple claas for testing of this:

class Tester (threading.Thread):

def __init__ (self, variable):
threading.Thread.__init__ (self)
self.__debug = True
self.__env_event = None

self.__appl = win32com.client.Dispatch 
('CANoe.Application')
self.__env = self.__appl.Environment
self.__var_name = variable
self.__var = self.__env.GetVariable (variable)

def run (self):
if self.__var != None:
self.__env_event = win32com.client.WithEvents 
(self.__var, Tester)
print 'run'
i = 0
while True:
pass
time.sleep (10)
print i
i = i + 1

def OnChange (self, value):
if self._debug: print ('VariableEvents:OnChange now called 
with %s' %value)

a = Tester ('dummy')
a.start ()

The run() dosn't work. I can't register the COM event. Have You a solution 
for this?
The claas tester works without self.__env_event = 
win32com.client.WithEvents (self.__var, Tester).

Regards,
Bernd
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Re: Why Python 3?

2014-04-20 Thread Bernd Waterkamp
Michael Torrie schrieb:

> For example, RHEL 6 is Red Hat's most current enterprise distribution and
> it does not yet even ship Python 2.7, to say nothing of Python 3.  RHEL
> 7 has python 2.7 as the default system dependency, and currently does
> not yet have any python3 packages in the official main repo, 

python2.7 and python3.3 are availabe in "RedHat Software Collections":

https://access.redhat.com/site/documentation/en-US/Red_Hat_Software_Collections/1/html/1.0_Release_Notes/chap-RHSCL.html
http://developerblog.redhat.com/2014/02/18/migrate-to-python3-w-rhscl/

So there is at least a chance if you want to (or have to) use "official"
packages from the distributor. 

Regards, 
Bernd
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Re: Python 3 and SSH Tunnel

2013-08-09 Thread Bernd Waterkamp
D. Xenakis schrieb:

> I've played with putty to achieve this but to be honest i'd like
> something more efficient. Opening putty everytime and making all the
> connection settings etc, and then running the programm, is kinda messy.
> Id like this to be done in an automatic way from the program so that
> things roll easy. I thought maybe i should find a way how to call and
> run a batch file from inside my python program or a powershell command,
> but i do not know even if that could work for the ssh tunneling. 
> 
> any ideas?

Both popular frameworks for python SSH  - twisted and paramiko - are still
being ported to python3. If you need to run your code on Windows, take a
look at plink, a command line tool for PuTTY:

http://the.earth.li/~sgtatham/putty/0.60/htmldoc/Chapter7.html#plink

You can wrap plink and your python script in a batch-file or call plink
from inside your script using subprocess. 
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Re: "Backward"-Iterator - Beginners question

2013-10-31 Thread Bernd Nawothnig
On 2013-10-31, Ulrich Goebel wrote:
> I'm locking for an "iterator" type with not only the .next() method, but 
> with a .previous(), .first() and .last() method, so that I can through 
> it from the beginning or from the end, and in both directions, even 
> alternately (for example two steps forward, one backward, two steps 
> forward).

Simply write a class with these methods. Where is the problem?




Bernd

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Re: Is this a correct way to generate an exception when getting a wrong parameter

2015-08-12 Thread Bernd Waterkamp
Mark Lawrence schrieb:

> The wonderful http://docopt.org/ makes this type of thing a piece of 
> cake.  I believe there's a newer library that's equivalent in 
> functionality to docopt but I can never remember the name of it, anybody?

Never used it, but "Click" is another choice: http://click.pocoo.org/4/
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Re: What is the state of MySQL support for Python 3?

2014-06-24 Thread Bernd Nawothnig
On 2014-06-24, [email protected] wrote:
> I'm starting a new project from scratch so I think its finally a time
> to switch to the latest and greatest Python 3.4.
>
> But I'm puzzled with MySQL support for Python 3. So far the only
> stable library I've found it pymysql.
>
> All others are either abandoned work-in-progress projects or do not
> support Python 3:
>   * mysqldb - Python 2.x only
>   * mysql-ctypes - Python 2.x only
>   * amysql - Python 2.x only
>   * ultramysql - Python 2.x only
>   * MySQL Connector/Python - new guy in block. Does anyone use it?

Yes. It comes directly from MySQL and is written in pure Python. For
that it may not be the fastest solution but it works.

Tested with Python 3.2




Bernd

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Re: How to get Timezone from latitude/longitude ?

2014-06-25 Thread Bernd Nawothnig
On 2014-06-25, [email protected] wrote:
> I'm looking for a python-library which can help me to get Timezone and
> Timezone-offset(UTC) from latitude/longitude. 
>
> I'm not able to find an easy way to do it.

You can find the data as a zipped shapefile here:

http://efele.net/maps/tz/world/

Download the data and use pyshp and/or gdal/ogr for the lookup.

It may not be as simple as you wanted it to be, but it is possible.




Bernd

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SSL certificate meta data

2006-09-25 Thread Bernd Will








Hello everybody,

 

please help me with this topic:

 

Working at a big company (+100.000 employees
worldwide), we have an amount of data centers and shared services where our
webservers, backend server etc. are located.

Now it happens from time to time, that certificates are
expired and instead of our data centers organizing new certificates in time, we
often are faced with expired certificates and offline connections.

 

The only solution from me and my colleagues view (as
poor at it sounds) is to setup a little python script “pinging” an
amount of about 2.000 servers in daily intervals checking for the validity of those
SSL certificates.

 

Though there is a lot of examples demonstrating how
to access SSL connections, I could not find a documentation about the
certificate’s data (validation information).

I would love to read programmatically some
information out of the certificates itself (who signed it and what is the
validation period, i.e. meta data).

 

Can someone please help me out here !?

(I know we should better setup a database with
validation dates, but believe me, we didn’t succeed in it)

 

Thanks in advance for any help or tip

 

Regards

Bernd






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Re: global lists

2005-05-08 Thread Bernd Nawothnig
On 2005-05-08, andrea crotti wrote:

> I have a little "problem", I don't understand the reason of this:

> a = [10,1,2,3]
> def foo():
>   global a
>   for el in a:
> el = el*2

Simple data types (as integer) are _not_ implemented as references as
you obviously expected. Instead el is copied by value from each a[n].
Thus you only changed temporary copies.

The whole list instead _is_ a reference. If you write 

b = a
b[0] = 57

a[0] will be effected too.


> This doesn't make any difference, if I do
> def foo():
>   global a
>   a[0] = 4

That should alter a[0].

> But
>
> def foo():
>   global a
>   for n in range(len(a)):
> a[n] = a[n]*2
>
> Doesn't work either...

It does. Test it again.



Bernd

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Re: A new to Python question

2005-05-14 Thread Bernd Nawothnig
On 2005-05-14, David wrote:

> abc(x,y,dotp,sumx,maxv)

(x,y,dotp,sumx,maxv) = abc(x,y,dotp,sumx,maxv)




Bernd

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Re: A new to Python question

2005-05-14 Thread Bernd Nawothnig
On 2005-05-14, Philippe C. Martin wrote:

> You're thinking you're passing the arguments as reference

That is the way Fortran handles them:

[...]

>> Right now I'm taking a simple program I wrote in Fortran




Bernd

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Re: A new to Python question

2005-05-14 Thread Bernd Nawothnig

> On 2005-05-14, M.E.Farmer wrote:

> (x,y,dotp,sumx,maxv) = abc(x,y,dotp,sumx,maxv)
> This will only create a tuple in memory that has no name to reference
> it by!

Maybe. But it does not seem to hurt. And I am not sure the tupel _is_
really created in that situation.

> How would you access the returned value?
> If you want a tuple you need to assign all the return vales to a single
> name.

We do not want the tuple.


Python 2.3.5 (#1, Apr 28 2005, 12:14:04)
[GCC 3.4.3-20050110 (Gentoo Linux 3.4.3.20050110-r2,
ssp-3.4.3.20050110-0, pie-
on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo():
>>> ... return 1,2,3
>>> ...
>>> (a,b,c)=foo()
>>> print a,b,c
1 2 3
>>>

works.

Of course, you can omit the ():

>>> a,b,c=foo()
>>> print a,b,c
1 2 3

That makes no difference.




Bernd

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Re: A new to Python question

2005-05-14 Thread Bernd Nawothnig
On 2005-05-14, M.E.Farmer wrote:

> I explained what i meant in previous post there was nothing more than
> just a discussion

No. You claimed


This will only create a tuple in memory


But we just learned that this is not the case.

> I have no real problem here just more of a sore point in style for
> me. I feel that parens are quite overloaded and it can be confusing
> to newbies. But if the parens are just fluff then get rid of them, it
> is clearer * at least to me * ;)

Reduced to this argument I have no objection.

> There are enough things wrapped in parens nowadays it is starting to
> look like lisp.

Lisp is far from being ugly ;-)




Bernd

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Re: Schily ueber Deutschland

2005-05-15 Thread Bernd Nawothnig
On 2005-05-15, [EMAIL PROTECTED] wrote:

> Lese selbst:
> http://www.heise.de/newsticker/meldung/59427

Ja, schlimm.

Trotzdem ist das hier

a) eine englischsprachige NG und
b) geht es hier um die Programmiersprache Python

Lass es also bitte endlich!



Bernd

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Re: A new to Python question

2005-05-15 Thread Bernd Nawothnig
On 2005-05-15, M.E.Farmer wrote:

>> No. You claimed
> 
> This will only create a tuple in memory
> 
> That is not what I said please do not edit my words and call it a
> quote!

Again the whole sentence:

Message-ID: <[EMAIL PROTECTED]>

| This will only create a tuple in memory that has no name to reference
| it by!

Please check it out. I did only cut the sentence. But that did not
change the sense of the part I quoted. (As I understood it, correct me
if I'm wrong, I'm not a native English speaker).

>> But we just learned that this is not the case.
> Yes it seems I was proven wrong and have learned much from the
> discussion ;) That is why I am here to learn from others and help if
> I can ( sometimes I am just plain wrong and I get the help )

I know that very well. I often learned much from such discussions too.

>> Reduced to this argument I have no objection.
> Glad to hear it.

>> Lisp is far from being ugly ;-)

> Your words not mine.I never said it was ugly.
> Lisp is beautiful but Python isn't Lisp, and the () *are* getting
> overloaded.

Understood and accepted.



Bernd

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Re: German spam event [was: Re: Schily ueber Deutschland]

2005-05-16 Thread Bernd Nawothnig
On 2005-05-16, François Pinard wrote:

>> I don't think that post was really from MAL.  It seems to be a
>> sporgery attack on the newsgroup.  Sigh.

> For the last two days, I receive quite an amount of robotic rejects,
> after my name was used as the forged From:

Same with me after my follow-up.

[...]

> Such forged From appears all the time as far as I am concerned, and
> had for years now.  But something significant happened this weekend.

Looks like another windows worm. Now they seem to come with a more
sofisticated 'payload'. I am sure that will increase in the future.
It is just the beginning ...



Bernd

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Re: newbie - variable "buried in quotes"

2005-05-16 Thread Bernd Nawothnig
On 2005-05-16, plsullivan wrote:
> I've got a variable deep inside some quotes needed by the application I
> am using. I can't figure out how to make this work. (Also, is there a
> line continuation character?)

> luser = win32api.GetUserName()

> gp.FeatureclassToCoverage_conversion("'Database
> [EMAIL PROTECTED]'
> POLYGON", prcl83, "", "DOUBLE") % luser

You poosibly meant something like that:

#v+
gp.FeatureclassToCoverage_conversion("'Database"
  "[EMAIL PROTECTED]'"
  "POLYGON" % luser, prcl83, "", "DOUBLE")
#v-



Bernd

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Re: newbie - variable "buried in quotes"

2005-05-16 Thread Bernd Nawothnig
On 2005-05-16, plsullivan wrote:

> If I follow your response Bernd, it looks like you interpreted that as
> several lines. It actually should all be on one line. That's what made
> me wonder if there is a line continuation character.

The lines are concatenated to one string as I wrote it.

See also fup from Peter Hansen for more explanations.



Bernd

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Re: newbie - variable "buried in quotes"

2005-05-16 Thread Bernd Nawothnig
On 2005-05-16, plsullivan wrote:
> Thanks guys but I am still not getting it. This part -->
> gp.FeatureclassToCoverage_conv­ersion("'Database
> [EMAIL PROTECTED]'
> POLYGON", prcl83, "", "DOUBLE") <--   % luser is one long command.

Yes, I understood you perfectly well.

> I need to be able to insert the luser variable deep in the middle of
> that.

luser will replace the '%s' in my version. Just try it!



Bernd

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Re: Recommended version of gcc for Python?

2005-05-16 Thread Bernd Nawothnig
On 2005-05-16, Dave Kuhlman wrote:

> Is there a recommended version of gcc that I should be using to
> compile Python?  I've compiled Python 2.4 with gcc 3.3.4 on Ubuntu
> Debian GNU/Linux.  However, I notice that gcc 3.5 and gcc 4.0 are
> available for installation.

I am on Gentoo Linux and use gcc 3.4.3 (~x86 == unstable) for almost
all ebuilds including Python 2.3.5 (x86 == stable). No malfunction so
far, and Gentoo depends heavily on Python. _If_ gcc 3.4 compiles a
source the resulting binary will work. The only problem is, not all
ebuilds compile without errors using gcc 3.4.

Simply try it.




Bernd

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Re: Empty string is False right?

2009-01-31 Thread Bernd Nawothnig
On 2009-01-31, AJ Ostergaard wrote:

> Thanks for that but why:

>>>> '' and True
> ''

> Surely that should be False?!?

It is:

#v+
>>> bool('' and True)
False
#v-



Bernd

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Re: Python Command Line Arguments

2017-04-14 Thread Bernd Nawothnig
On 2017-04-13, Jason Friedman wrote:
>> I have this code which I got from https://www.tutorialspoint.
>> com/python/python_command_line_arguments.htm The example works fine but
>> when I modify it to what I need, it only half works. The problem is the
>> try/except. If you don't specify an input/output, they are blank at the end
>> but it shouldn't be.
>>
>> import getopt
>> import sys
>
> I am guessing you are wanting to parse command-line arguments rather than
> particularly wanting to use the getopt module.
> If I am correct you might want to spend your time instead learning the
> argparse module:
> https://docs.python.org/3/library/argparse.html
> https://docs.python.org/3/howto/argparse.html

He should switch to argparse in any case because getopt is no longer
supported and does only receive bugfixes.




Bernd

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Re: "Goto" statement in Python

2017-04-14 Thread Bernd Nawothnig
On 2017-04-13, Mikhail V wrote:
> On 13 April 2017 at 18:48, Ian Kelly  wrote:
>> On Thu, Apr 13, 2017 at 10:23 AM, Mikhail V  wrote:
>>> Now I wonder, have we already collected *all* bells and whistles of Python
>>> in these two examples, or is there something else for expressing trivial 
>>> thing.
>>
>> Functions and exceptions are considered "bells and whistles"?
>
> You mean probably classes and exceptions? For me, indeed they are,
> but it depends.
>
> And breaking the code into def() chunks that are not
> functions but just chunks... I don't know, looks bad.

Organising code in a bunch of small functions is by far better coding
style and better readable than put it all together in one chunk. And
that holds for all programming languages, not only for Python.



Bernd

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Re: "Goto" statement in Python

2017-04-14 Thread Bernd Nawothnig
On 2017-04-13, Grant Edwards wrote:
> On 2017-04-13, Rob Gaddi  wrote:
>
>> No, C doesn't support exception handling.  As a result, handling error 
>> conditions in C is a huge pain for which (forward-only) goto is often, 
>> while not the only remedy, the least painful one.
>
> Indeed. That is almost the only place I use 'goto' in C, and the
> almost the only place I see others use it.  Very occasionally, you see
> a the error handling goto refactored into a backwards "goto retry":
>
> this code
>
> foo()
>   {
>   while (1)
> {
>   
>   if ()
>goto error:
>   
>   return;
>
> error:
>   
> }
>   }

foo()
  {
  int done = 0;
  while (! done)
{
  
  if () {

  } else {
done = 1;

 }
  }




Bernd

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problems installing Python 3.11

2023-08-10 Thread Bernd Lentes via Python-list
Hi ML,

i hope this is the right place for my question. If not please tell me where I 
can ask.

I tried to install python 3.11.4 on a SLES 15 SP5.
./configure ran fine, just one package missing. Installed the package, 
configure ran fine with complaints.
make was ok, make test not.
This is what I got to the end:
===
===
ERROR: test_build_cpp11 (test.test_cppext.TestCPPExt.test_build_cpp11)
--
Traceback (most recent call last):
  File "/root/Python-3.11.4/Lib/test/test_cppext.py", line 21, in 
test_build_cpp11
self.check_build(False, '_testcpp11ext')
  File "/root/Python-3.11.4/Lib/test/test_cppext.py", line 39, in check_build
self._check_build(std_cpp03, extension_name)
  File "/root/Python-3.11.4/Lib/test/test_cppext.py", line 80, in _check_build
run_cmd('Build', cmd)
  File "/root/Python-3.11.4/Lib/test/test_cppext.py", line 64, in run_cmd
subprocess.run(cmd, check=True)
  File "/root/Python-3.11.4/Lib/subprocess.py", line 571, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['env/bin/python', '-X', 'dev', 
'/root/Python-3.11.4/Lib/test/setup_testcppext.py', 'build_ext', '--verbose']' 
returned non-zero exit status 1.

--
Ran 2 tests in 9.939s

FAILED (errors=2)
test test_cppext failed
1 test failed again:
test_cppext

== Tests result: FAILURE then FAILURE ==

403 tests OK.

1 test failed:
test_cppext

30 tests skipped:
test_bz2 test_curses test_dbm_gnu test_dbm_ndbm test_devpoll
test_gdb test_idle test_ioctl test_kqueue test_launcher test_lzma
test_msilib test_nis test_ossaudiodev test_readline test_smtpnet
test_sqlite3 test_ssl test_startfile test_tcl test_tix test_tk
test_ttk_guionly test_ttk_textonly test_turtle test_winconsoleio
test_winreg test_winsound test_zipfile64 test_zoneinfo

2 re-run tests:
test___all__ test_cppext

Total duration: 28 min 23 sec
Tests result: FAILURE then FAILURE
make: *** [Makefile:1798: test] Error 2

=

I'm not very familiar with compiling software, normally I use the packages from 
my distro.
Can you help me ? Or maybe there is no big problem, afterall 403 tests were 
fine and just two not.
I need Python 3.11 for borgbackup.

Thanks.

Bernd

Bernd Lentes

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RE: problems installing Python 3.11

2023-08-11 Thread Bernd Lentes via Python-list

>-Original Message-
>From: Terry Reedy 
>Sent: Thursday, August 10, 2023 9:55 PM
>To: Bernd Lentes 
>Subject: Re: problems installing Python 3.11
>
>On 8/10/2023 3:28 PM, Bernd Lentes via Python-list wrote:
>
>Private response because cannot post at present.
>
>It appears that what failed is building a C++ extension.  (You can dig into 
>the test
>code to check.  It is skipped on my Windows.)  If you do not need to do that, 
>you
>should not have a problem.
>

Hi Terry,

I found out that cc1plus was missing. I installed g++, rerun make and this 
error disappeared.
But another has arised:


--- STDERR ---
Traceback (most recent call last):
  File "", line 1, in 
  File "/tmp/tmphpwu2qwj/cpython/Lib/sysconfig.py", line 715, in get_config_var
return get_config_vars().get(name)
   ^
  File "/tmp/tmphpwu2qwj/cpython/Lib/sysconfig.py", line 670, in get_config_vars
_init_posix(_CONFIG_VARS)
  File "/tmp/tmphpwu2qwj/cpython/Lib/sysconfig.py", line 531, in _init_posix
_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
^
ModuleNotFoundError: No module named '_sysconfigdata__linux_x86_64-linux-gnu'

 END 
building python parallel='-j21' in /tmp/tmphpwu2qwj/python-build...
installing python into /tmp/tmphpwu2qwj/python-installation...
freezing /tmp/tmphpwu2qwj/app.py...
ok

--
Ran 1 test in 95.606s

OK

== Tests result: FAILURE then SUCCESS ==

404 tests OK.

30 tests skipped:
test_bz2 test_curses test_dbm_gnu test_dbm_ndbm test_devpoll
test_gdb test_idle test_ioctl test_kqueue test_launcher test_lzma
test_msilib test_nis test_ossaudiodev test_readline test_smtpnet
test_sqlite3 test_ssl test_startfile test_tcl test_tix test_tk
test_ttk_guionly test_ttk_textonly test_turtle test_winconsoleio
test_winreg test_winsound test_zipfile64 test_zoneinfo

1 re-run test:
test_tools

Total duration: 29 min 56 sec
Tests result: FAILURE then SUCCESS

====

Or does " FAILURE then SUCCESS" mean that everything is ok now ?

Bernd

Helmholtz Zentrum München – Deutsches Forschungszentrum für Gesundheit und 
Umwelt (GmbH)
Ingolstädter Landstraße 1, D-85764 Neuherberg, https://www.helmholtz-munich.de
Geschäftsführung: Prof. Dr. med. Dr. h.c. Matthias Tschöp, Daniela Sommer 
(komm.) | Aufsichtsratsvorsitzende: MinDir’in Prof. Dr. Veronika von Messling
Registergericht: Amtsgericht München HRB 6466 | USt-IdNr. DE 129521671
-- 
https://mail.python.org/mailman/listinfo/python-list


RE: problems installing Python 3.11

2023-08-11 Thread Bernd Lentes via Python-list

>-Original Message-
>From: Python-list [email protected]> On Behalf Of Bernd Lentes via Python-list
>Sent: Friday, August 11, 2023 12:01 PM
>To: Terry Reedy 
>Cc: Python ML ([email protected]) 
>Subject: RE: problems installing Python 3.11

Hi,

I read the readme.rst and found something helpful.
I reran explicitly the test which failed:

=
localhost:~/Python-3.11.4 # make test TESTOPTS="-v test_tools"
 CC='gcc -pthread' LDSHARED='gcc -pthread -shared' OPT='-DNDEBUG -g -fwrapv 
-O3 -Wall'  ./python -E ./setup.py  build
running build
running build_ext

The necessary bits to build these optional modules were not found:
_bz2  _curses   _curses_panel
_dbm  _gdbm _hashlib
_lzma _ssl  _tkinter
_uuid nis   readline
To find the necessary bits, look in setup.py in detect_modules() for the 
module's name.


The following modules found by detect_modules() in setup.py have not
been built, they are *disabled* by configure:
_sqlite3


Could not build the ssl module!
Python requires a OpenSSL 1.1.1 or newer

running build_scripts
copying and adjusting /root/Python-3.11.4/Tools/scripts/pydoc3 -> 
build/scripts-3.11
copying and adjusting /root/Python-3.11.4/Tools/scripts/idle3 -> 
build/scripts-3.11
copying and adjusting /root/Python-3.11.4/Tools/scripts/2to3 -> 
build/scripts-3.11
changing mode of build/scripts-3.11/pydoc3 from 644 to 755
changing mode of build/scripts-3.11/idle3 from 644 to 755
changing mode of build/scripts-3.11/2to3 from 644 to 755
renaming build/scripts-3.11/pydoc3 to build/scripts-3.11/pydoc3.11
renaming build/scripts-3.11/idle3 to build/scripts-3.11/idle3.11
renaming build/scripts-3.11/2to3 to build/scripts-3.11/2to3-3.11
./python -E  ./Tools/scripts/run_tests.py -v test_tools
/root/Python-3.11.4/python -u -W default -bb -E -E -m test -r -w -j 0 -u 
all,-largefile,-audio,-gui -v test_tools
== CPython 3.11.4 (main, Aug 11 2023, 00:05:59) [GCC 7.5.0]
== Linux-5.14.21-150500.55.12-default-x86_64-with-glibc2.31 little-endian
== cwd: /root/Python-3.11.4/build/test_python_8347æ
== CPU count: 32
== encodings: locale=UTF-8, FS=utf-8
Using random seed 9455548
0:00:00 load avg: 0.07 Run tests in parallel using 34 child processes
0:00:30 load avg: 2.51 running: test_tools (30.0 sec)
0:01:00 load avg: 2.44 running: test_tools (1 min)
0:01:30 load avg: 2.16 running: test_tools (1 min 30 sec)
0:01:40 load avg: 2.21 [1/1] test_tools passed (1 min 40 sec)
test_alter_comments (test.test_tools.test_fixcid.Test.test_alter_comments) ... 
ok
test_directory (test.test_tools.test_fixcid.Test.test_directory) ... ok
test_parse_strings (test.test_tools.test_fixcid.Test.test_parse_strings) ... ok
test_freeze_simple_script 
(test.test_tools.test_freeze.TestFreeze.test_freeze_simple_script) ... creating 
the script to be frozen at /tmp/tmp73do0elf/app.py
copying the source tree into /tmp/tmp73do0elf/cpython...
configuring python in /tmp/tmp73do0elf/python-build...
CalledProcessError: Command '['/tmp/tmp73do0elf/cpython/python', '-c', 'import 
sysconfig; print(sysconfig.get_config_var("CONFIG_ARGS"))']' returned non-zero 
exit status 1.
--- STDOUT ---

--- STDERR ---
Traceback (most recent call last):
  File "", line 1, in 
  File "/tmp/tmp73do0elf/cpython/Lib/sysconfig.py", line 715, in get_config_var
return get_config_vars().get(name)
   ^
  File "/tmp/tmp73do0elf/cpython/Lib/sysconfig.py", line 670, in get_config_vars
_init_posix(_CONFIG_VARS)
  File "/tmp/tmp73do0elf/cpython/Lib/sysconfig.py", line 531, in _init_posix
_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
^
ModuleNotFoundError: No module named '_sysconfigdata__linux_x86_64-linux-gnu'

 END 
building python parallel='-j21' in /tmp/tmp73do0elf/python-build...
installing python into /tmp/tmp73do0elf/python-installation...
freezing /tmp/tmp73do0elf/app.py...
ok
test_gprof (test.test_tools.test_gprof2html.Gprof2htmlTests.test_gprof) ... ok
test_POT_Creation_Date 
(test.test_tools.test_i18n.Test_pygettext.test_POT_Creation_Date)
Match the date format from xgettext for POT-Creation-Date ... ok
test_calls_in_fstring_with_keyword_args 
(test.test_tools.test_i18n.Test_pygettext.test_calls_in_fstring_with_keyword_args)
 ... ok
test_calls_in_fstring_with_multiple_args 
(test.test_tools.test_i18n.Test_pygettext.test_calls_in_fstring_with_multiple_args)
 ... ok
test_calls_in_fstring_with_partially_wrong_expression 
(test.test_tools.test_i18n.Test_pygettext.test_calls_in_fstring_with_partially_wrong_expression)
 ... ok
test_calls_in_fstri