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From: JKPeck on 1 Jan 2010 10:41
The gettext module uses the convention of defining a function named
"_" that maps text into its translation.
This conflicts with the automatic interactive interpreter assignment
of expressions to a variable with that same name.

While if you are careful, you can avoid that assignment while
debugging, and you can choose a different function for gettext, this
conflict is a nuisance. I am looking for a way to suppress the
expression assignment to _ or to change the name of the variable
assigned to. Is this possible? Using Python 2.6.

TIA,
Jon Peck
From: Peter Otten on 1 Jan 2010 12:06
JKPeck wrote:

> The gettext module uses the convention of defining a function named
> "_" that maps text into its translation.
> This conflicts with the automatic interactive interpreter assignment
> of expressions to a variable with that same name.
>
> While if you are careful, you can avoid that assignment while
> debugging, and you can choose a different function for gettext, this
> conflict is a nuisance. I am looking for a way to suppress the
> expression assignment to _ or to change the name of the variable
> assigned to. Is this possible? Using Python 2.6.


$ cat displayhook.py
import sys
import __builtin__ as builtin

def displayhook(obj):
if obj is not None:
builtin._last_result = obj
print repr(obj)

sys.displayhook = displayhook
$ python -i displayhook.py
>>> 42
42
>>> _
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name '_' is not defined
>>> _last_result
42

From: JKPeck on 1 Jan 2010 13:53
On Jan 1, 10:06 am, Peter Otten <__pete...(a)web.de> wrote:
> JKPeck wrote:
> > The gettext module uses the convention of defining a function named
> > "_" that maps text into its translation.
> > This conflicts with the automatic interactive interpreter assignment
> > of expressions to a variable with that same name.
>
> > While if you are careful, you can avoid that assignment while
> > debugging, and you can choose a different function for gettext, this
> > conflict is a nuisance.  I am looking for a way to suppress the
> > expression assignment to _ or to change the name of the variable
> > assigned to.  Is this possible?  Using Python 2.6.
>
> $ cat displayhook.py
> import sys
> import __builtin__ as builtin
>
> def displayhook(obj):
>     if obj is not None:
>         builtin._last_result = obj
>         print repr(obj)
>
> sys.displayhook = displayhook
> $ python -i displayhook.py>>> 42
> 42
> >>> _
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> NameError: name '_' is not defined>>> _last_result
>
> 42

Thanks. It's just what I needed.
-Jon Peck
From: Gabriel Genellina on 4 Jan 2010 03:51
En Fri, 01 Jan 2010 15:53:31 -0300, JKPeck <jkpeck(a)gmail.com> escribi�:
> On Jan 1, 10:06 am, Peter Otten <__pete...(a)web.de> wrote:
>> JKPeck wrote:

>> > The gettext module uses the convention of defining a function named
>> > "_" that maps text into its translation.
>> > This conflicts with the automatic interactive interpreter assignment
>> > of expressions to a variable with that same name.
>>
>> $ cat displayhook.py
>> [...]
>
> Thanks. It's just what I needed.

In case you didn't know, look at sitecustomize.py and the PYTHONSTARTUP
[2] environment variable. They allow for the above code to be
automatically executed.

[1] http://docs.python.org/library/site.html#index-549
[2] http://docs.python.org/using/cmdline.html#envvar-PYTHONSTARTUP

--
Gabriel Genellina

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