PyQt4:在 trUtf8 字符串中检测到非 ASCII 字符 [英] PyQt4: Non-ASCII character detected in trUtf8 string

问题描述

我想弄清楚如何为 PyQt tr() 或 trUtf8() 函数提供 UTF-8 文本.

I'm trying to figure out how to feed the PyQt tr() or trUtf8() functions UTF-8 text.

以下是字符串示例:

self.tr('λληνικά')
self.tr(u'εληνικά')
self.tr('ελνικά'.encode('utf-8'))
self.tr(u'ελληικά'.encode('utf-8'))
self.trUtf8('λληνικ')
self.trUtf8(u'εληνιά')
self.trUtf8('ελνι'.encode('utf-8'))
self.trUtf8(u'ελλκά'.encode('utf-8'))

带有 self.tr 的那些在 Qt Linguist 中显示为乱码.带有 self.trUtf8 的显示正常，但在应用 pylupdate4 时会触发警告:

The ones with self.tr display as gibberish in Qt Linguist. The ones with self.trUtf8 display fine, but they trigger a warning when applying pylupdate4:

Non-ASCII character detected in trUtf8 string

前导 u 和 .encode('utf-8') 似乎没有任何区别，至少在解析时(使用 pylupdate4).

The leading u and the .encode('utf-8') don't seem to make any difference, at least at parsing time (using pylupdate4).

正确的方法是什么?

我也想知道这条线的作用:

I'm also wondering about the role of this line:

QtCore.QTextCodec.setCodecForTr(QtCore.QTextCodec.codecForName("utf-8"))

但我知道它对 pylupdate4 的文件解析没有影响，它只能在执行时产生影响.

But I know it has no effect on file parsing by pylupdate4, it could only make a difference at execution time.

推荐答案

tr 和 trUtf8 的区别在于，后者明确声明编码为 UTF-8.

The difference between tr and trUtf8, is that the latter explicitly declares that the encoding is UTF-8.

就其本身而言，tr 不暗示字符串的编码，因此您只能将其传递为 ascii 字符串，或者使用 setCodecForTr.但正如您猜测的那样，这只会在运行时产生影响.为了使 pylupdate 也使用该编码，您需要在 pro 文件中设置相应的变量:

On its own, tr implies nothing about the encoding of the string, and so you either must only ever pass it ascii strings, or explicitly set an appropriate encoding using setCodecForTr. But as you surmised, that will only have an effect at runtime. In order for pylupdate to also use that encoding, you need to set a corresponding variable in the pro file:

CODECFORTR = UTF-8
SOURCES = source.py
TRANSLATIONS = translation.ts

(似乎 pylupdate 将假定没有它的 latin-1 编码，因此该编码中不可用的任何字符最终都会成为 mojibake).

(It seems that pylupdate will assume a latin-1 encoding without that, so any characters not available in that encoding will end up as mojibake).

至于警告消息:它们可能是为了反映 有关可移植性问题的 trUtf8 的 Qt 文档.

As for the warnings messages: they are probably there to reflect the corresponding warnings in the Qt docs for trUtf8 regarding portability issues.

最好的方法是使用 tr 并将编码显式设置为 UTF-8.trUtf8 函数在 Qt4 中实际上已过时.它甚至在 Qt5 中都不存在，它假定所有内容都使用 UTF-8 - 所以最终你甚至不需要显式设置编码.

The best way to proceeed is to use tr and explicitly set the encoding to UTF-8. The trUtf8 function is effectively obsolete in Qt4. It doesn't even exist in Qt5, which assumes UTF-8 for everything - so eventually you won't even need to explicitly set the encoding.

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