GNU gettext Example

This example demonstrates the use of GNU gettext for translating applications as described in translations.

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main.py

# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations

from pathlib import Path
import gettext
import sys

from PySide6.QtCore import QItemSelection, Slot
from PySide6.QtWidgets import (QAbstractItemView, QApplication, QListWidget,
                               QMainWindow)


_ = None
ngettext = None


class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        file_menu = self.menuBar().addMenu(_("&File"))
        quit_action = file_menu.addAction(_("Quit"))
        quit_action.setShortcut(_("CTRL+Q"))
        quit_action.triggered.connect(self.close)

        self._list_widget = QListWidget()
        self._list_widget.setSelectionMode(QAbstractItemView.MultiSelection)
        self._list_widget.selectionModel().selectionChanged.connect(self.selection_changed)
        self._list_widget.addItem("C++")
        self._list_widget.addItem("Java")
        self._list_widget.addItem("Python")
        self.setCentralWidget(self._list_widget)

    @Slot(QItemSelection, QItemSelection)
    def selection_changed(self, selected, deselected):
        count = len(self._list_widget.selectionModel().selectedRows())
        message = ngettext("{0} language selected",
                           "{0} languages selected", count).format(count)
        self.statusBar().showMessage(message)


if __name__ == '__main__':
    app = QApplication(sys.argv)

    src_dir = Path(__file__).resolve().parent
    try:
        translation = gettext.translation('example', localedir=src_dir / 'locales')
        if translation:
            translation.install()
            _ = translation.gettext
            ngettext = translation.ngettext
    except FileNotFoundError:
        pass
    if not _:
        _ = gettext.gettext
        ngettext = gettext.ngettext
        print('No translation found')

    window = Window()
    window.show()
    sys.exit(app.exec())

locales/example.pot

# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: PySide6 gettext example\n"
"POT-Creation-Date: 2021-07-05 14:16+0200\n"
"Language: de_DE\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Plural-Forms: nplurals=2; plural==n != 1;\n"

#: main.py:57
msgid "&File"
msgstr ""

#: main.py:58
msgid "Quit"
msgstr ""

#: main.py:59
msgid "CTRL+Q"
msgstr ""

#: main.py:73
#, python-brace-format
msgid "{0} language selected"
msgid_plural "{0} languages selected"
msgstr[0] ""
msgstr[1] ""

locales/de_DE/LC_MESSAGES/example.pot

# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: PySide6 gettext example\n"
"POT-Creation-Date: 2021-07-05 14:16+0200\n"
"Language: de_DE\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"Plural-Forms: nplurals=2; plural=n != 1;\n"

#: main.py:57
msgid "&File"
msgstr "&Datei"

#: main.py:58
msgid "Quit"
msgstr "Beenden"

#: main.py:59
msgid "CTRL+Q"
msgstr "CTRL+B"

#: main.py:73
#, python-brace-format
msgid "{0} language selected"
msgid_plural "{0} languages selected"
msgstr[0] "{0} Sprache ausgewählt"
msgstr[1] "{0} Sprachen ausgewählt"