Android 上的 kivy/Python 上缺少 Unicode 编解码器?

问题描述

我有一个在 kivy 下运行的程序，它在 Windows 上运行良好，但在 Android 上打开文件失败(两个平台上都是 1.8.0).奇怪的是，当我明确要求 utf-8 时，错误消息表明它正在尝试解码 ASCII；该文件的任何地方都没有 0xFF 字符 - 我使用 od 实用程序进行了检查.

I have a program running under kivy that works fine on Windows but fails on opening a file on Android (1.8.0 on both platforms). The odd thing is that the error message indicates it's trying to decode ASCII when I'm plainly asking for utf-8; also the file doesn't have a 0xFF character anywhere in it - I checked with the od utility.

代码:

try:
    Logger.info('Mark: opening file ' + repr(filename))
    with codecs.open(filename, 'r', encoding='utf_8') as f:
        lines = [line.rstrip(u'
').lstrip(codecs.BOM) for line in f]
except UnicodeDecodeError as e:
    Logger.info('Mark: utf8 load failed: ' + str(e))
    with codecs.open(filename, 'r', encoding='cp1252') as f:
        lines = [line.rstrip(u'
') for line in f]

日志文件:

[INFO              ] Mark: opening file '/mnt/sdcard/My Files/Documents/DVDs.txt'
[INFO              ] Mark: utf8 load failed: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)
[INFO              ] Base: Leaving application in progress...
[WARNING           ] stderr: Traceback (most recent call last):
[WARNING           ] stderr:   File "main.py", line 295, in <module>
[WARNING           ] stderr:     app.run()
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/app.py", line 792, in run
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/base.py", line 481, in runTouchApp
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/core/window/window_pygame.py", line 381, in mainloop
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/core/window/window_pygame.py", line 287, in _mainloop
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/base.py", line 321, in idle
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/clock.py", line 422, in tick
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/clock.py", line 537, in _process_events
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/site-packages/kivy/clock.py", line 309, in tick
[WARNING           ] stderr:   File "main.py", line 266, in select_file_part2
[WARNING           ] stderr:     with codecs.open(filename, 'r', encoding='cp1252') as f:
[WARNING           ] stderr:   File "/home/tito/code/python-for-android/build/python-install/lib/python2.7/codecs.py", line 884, in open
[WARNING           ] stderr: LookupError: unknown encoding: cp1252

我放入了一些调试代码以通过 整个列表，发现除了 ascii、latin_1 和各种 utf 编解码器之外的所有内容都丢失了.

I put in some debugging code to go through the entire list and found that all were missing except ascii, latin_1, and the various utf codecs.

推荐答案

摆脱try/except，看看真正的异常.codecs.BOM 是一个字节字符串 xffxfe 并且使用默认的 ascii 编解码器强制转换为 Unicode:

Get rid of the try/except and look at the real exception. codecs.BOM is a byte string xffxfe and it is being coerced into Unicode using the default ascii codec:

>>> import codecs
>>> codecs.BOM
'xffxfe'
>>> u'test'.lstrip(codecs.BOM)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)

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