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gh-54738: Add argparse i18n howto (#104562)
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@ -788,6 +788,59 @@ but not both at the same time:
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-q, --quiet
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How to translate the argparse output
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====================================
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The output of the :mod:`argparse` module such as its help text and error
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messages are all made translatable using the :mod:`gettext` module. This
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allows applications to easily localize messages produced by
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:mod:`argparse`. See also :ref:`i18n-howto`.
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For instance, in this :mod:`argparse` output:
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.. code-block:: shell-session
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$ python prog.py --help
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usage: prog.py [-h] [-v | -q] x y
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calculate X to the power of Y
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positional arguments:
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x the base
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y the exponent
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options:
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-h, --help show this help message and exit
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-v, --verbose
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-q, --quiet
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The strings ``usage:``, ``positional arguments:``, ``options:`` and
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``show this help message and exit`` are all translatable.
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In order to translate these strings, they must first be extracted
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into a ``.po`` file. For example, using `Babel <https://babel.pocoo.org/>`__,
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run this command:
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.. code-block:: shell-session
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$ pybabel extract -o messages.po /usr/lib/python3.12/argparse.py
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This command will extract all translatable strings from the :mod:`argparse`
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module and output them into a file named ``messages.po``. This command assumes
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that your Python installation is in ``/usr/lib``.
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You can find out the location of the :mod:`argparse` module on your system
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using this script::
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import argparse
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print(argparse.__file__)
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Once the messages in the ``.po`` file are translated and the translations are
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installed using :mod:`gettext`, :mod:`argparse` will be able to display the
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translated messages.
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To translate your own strings in the :mod:`argparse` output, use :mod:`gettext`.
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Conclusion
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==========
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@ -411,6 +411,7 @@ One difference between this module and Henstridge's: his catalog objects
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supported access through a mapping API, but this appears to be unused and so is
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not currently supported.
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.. _i18n-howto:
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Internationalizing your programs and modules
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--------------------------------------------
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@ -0,0 +1 @@
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Add documentation on how to localize the :mod:`argparse` module.
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