从Qt Designer和PyQt开始

Question

I love Python and I have heard a lot about Qt, so lately I've started creating simple GUI applications. When I convert by pyuic *.ui file to *.py everything looks familiar, understandable and reasonable. Except for one moment.

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

and then a lot of lines like:

MainWindow.setObjectName(_fromUtf8("MainWindow"))
self.label_5.setObjectName(_fromUtf8("label_5"))

MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.label_5.setText(_translate("MainWindow", "Surname", None))

When I create any application without using _fromUtf8() and _translate() methods like:

MainWindow.setObjectName("MainWindow")
self.label_5.setText("Surname")

everything works as well.

So, here is a question: Do I really need to use _fromUtf8() and _translate() methods?

If yes, why?

Thanks in advance.

Answer 1

These methods are utilized for internationalization of your application. If you are not planning on ever supporting the UI in multiple languages, then you can disable all of the translatable settings on your Widget.

Several Widgets have multiple areas that have this setting. For example, a QLabel has 4:

• toolTip
• statusTip
• whatsThis
• text

The _fromUtf8 is utilized if you are using a language that utilizes characters that occupy more than ASCII characters (think anything with diacritics or multi-byte characters).