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devel / comp.lang.python / GNU gettext: Print string translated and untranslated at the same time

GNU gettext: Print string translated and untranslated at the same time

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From: c.bu...@posteo.jp
Newsgroups: comp.lang.python
Subject: GNU gettext: Print string translated and untranslated at the same time
Date: Thu, 17 Aug 2023 07:10:32 +0000
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by: c.bu...@posteo.jp - Thu, 17 Aug 2023 07:10 UTC

X-Post: https://stackoverflow.com/q/76913082/4865723

I want to display one string in its original source (untranslated)
version and in its translated version site by site without duplicating
the string in the python source code?
It wouldn't be a big deal if it is only one word.

print('The translated string "{}" is originally
"{}".'.format(_('Hello'), 'Hello'))

But in my situation it is a multi line string containing multiple
paragraphs. It is a full text. I don't want to duplicate that string.

# Imagine 'Hello' as a 50x70 characters multi line string.
original = 'Hello'
translated = _('Hello')
print('The translated string "{}" is originally
"{}".'.format(translated, original))

I do use the "class based API" of GNU gettext. My current approach,
which is not working, is to somehow (how!?) disable (or mask) the
translation function "_()" temporarily.
But as described in the stackoverflow question (see first line of this
mail) this do not work.

def foobar(translate):
if not translate:
# I try to mask the global _() builtins-function
def _(txt):
return txt

return _('Hello')

if __name__ == '__main__':

# To ilustrate that _() is part of "builtins" namespace
print(_('No problem.'))

print('The translated string "{}" is originally "{}".'
.format(foobar(True), foobar(False)))

This is the output:

Traceback (most recent call last):
File "/home/user/ownCloud/_transfer/./z.py", line 27, in <module>
.format(foobar(True), foobar(False)))
File "/home/user/ownCloud/_transfer/./z.py", line 19, in foobar
return _('Hello')
UnboundLocalError: local variable '_' referenced before assignment

The full MWE can be found at stackoverflow
(https://stackoverflow.com/q/76913082/4865723).

The question is if this can be solved somehow or if there is an
alternative approach.
The "_()" function is installed in the builtins namespace because of
gettext class based API. This is nice.
Maybe I can somehow manipulate that builtins namespace? I tried to
import builtins and played around with it but couldn't find a way to do
it.

Thanks
Christian Buhtz

PS: This is IMHO not relevant for my question but if someone is
interested the connection to productive code can be found in this issue:
https://github.com/bit-team/backintime/issues/1473 There I describe what
I want to achive and also provide a GUI mockup.

Re: GNU gettext: Print string translated and untranslated at the same time

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From: greg.ew...@canterbury.ac.nz (Greg Ewing)
Newsgroups: comp.lang.python
Subject: Re: GNU gettext: Print string translated and untranslated at the same
time
Date: Fri, 18 Aug 2023 18:14:44 +1200
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by: Greg Ewing - Fri, 18 Aug 2023 06:14 UTC

On 17/08/23 7:10 pm, c.buhtz@posteo.jp wrote:
> def foobar(translate):
>     if not translate:
>         # I try to mask the global _() builtins-function
>         def _(txt):
>             return txt
>
>     return _('Hello')

This causes _ to become a local that is left undefined on one
branch of the if. You need to ensure it's always defined. Here's
one way that should work:

gttran = _

def foobar(translate):
def _(txt):
if translate:
return gttran(txt)
else:
return txt
return _('Hello')

--
Greg

Subject	Author
GNU gettext: Print string translated and untranslated at the same time	c.buhtz
Re: GNU gettext: Print string translated and untranslated at the same	Greg Ewing