Is it possible to translate the own messages of argparse?

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Is it possible to translate the own messages of argparse?

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#1 by (2 votes)

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I have several command-line python scripts that handle several parameters to invoke them, this I resolve through argparse , which is very simple, however this library has some messages in English (at least in python 3.4) that I would like to translate, let's see an example:

# -*- coding: utf-8 -*-
import argparse

def init_argparse():
    cmdparser = argparse.ArgumentParser(prog='programa', description='descripcion')
    cmdparser.add_argument('archivo', type=str, nargs='?', help="Archivo de input", metavar="\"archivo a interpretar\"")
    cmdparser.add_argument("-v", "--version", action='version', help="mostrar la versión y salir", version="1.1.1")
    return cmdparser

if __name__ == "__main__":

    cmdparser = init_argparse()
    try:
        args = cmdparser.parse_args()
    except IOError as msg:
        cmdparser.error(str(msg))
        sys.exit(-1)

If this Script is executed as python miscript.py --help , I get the following output:

usage: programa [-h] [-v] ["archivo a interpretar"]

descripcion

positional arguments:
  "archivo a interpretar"
                        Archivo de input

optional arguments:
  -h, --help            show this help message and exit
  -v, --version         mostrar la versión y salir

As you can see there are texts like "usage", "positional arguments", "optional arguments" and others that are in English. How can I translate them so that the interface is consistent?

python argparse

asked by Patricio Moracho 05.05.2017 в 17:45

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1 answer

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score 2 · Accepted Answer

I do not know if it is the best solution, but I could solve it in the following way:

First you have to import gettext , the multilanguage service of python

Then you have to create your own translation routine, for example: my_gettext and set the same in gettext.gettext = my_gettext . With this we can control the translation process of the chains, previously we must investigate which chains are the ones that we are going to translate, some are "fstrings" type.

The routine my_gettext should check the strings that are requested to translate and we should replace them with the versions that we want

All this must be done before importing argparse , also do not forget to make sure that the file is in utf-8, this way it would end up being our example:

# -*- coding: utf-8 -*-

import gettext

def my_gettext(s):
  """my_gettext: Traducir algunas cadenas de argparse."""
  current_dict = {
              'usage: ': 'uso: ',
              'optional arguments': 'argumentos opcionales',
              'show this help message and exit': 'mostrar esta ayuda y salir',
              'positional arguments': 'argumentos posicionales',
              'the following arguments are required: %s': 'los siguientes argumentos son requeridos: %s',
              'show program''s version number and exit': 'Mostrar la versión del programa y salir',
              'expected one argument': 'se espera un valor para el parámetro',
              'expected at least one argument': 'se espera al menos un valor para el parámetro'
  }
  print(s)
  if s in current_dict:
      return current_dict[s]
  return s

#gettext.gettext = my_gettext

import argparse

def init_argparse():
    cmdparser = argparse.ArgumentParser(prog='programa', description='descripcion')
    cmdparser.add_argument('archivo',type=str, nargs='?', help="Archivo de input", metavar="\"archivo a interpretar\"")
    cmdparser.add_argument("-v", "--version",action='version', help="mostrar la versión y salir", version="1.1.1")
    return cmdparser

if __name__ == "__main__":

    cmdparser = init_argparse()
    try:
        args = cmdparser.parse_args()
    except IOError as msg:
        cmdparser.error(str(msg))
        sys.exit(-1)

The exit, now it is more consistent:

uso: programa [-h] [-v] ["archivo a interpretar"]

descripcion

argumentos posicionales:
  "archivo a interpretar"
                        Archivo de input

argumentos opcionales:
  -h, --help            mostrar esta ayuda y salir
  -v, --version         mostrar la versión y salir