[Python-Dev] Python-3.0, unicode, and os.environ (original) (raw)
Ulrich Eckhardt eckhardt at satorlaser.com
Tue Dec 9 19:31:29 CET 2008
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On Monday 08 December 2008, Adam Olsen wrote:
At this point someone suggests we have a type that can store an arbitrary mix of unicode and bytes, so the undecodable portions stay in their original form. :P
Well, not an arbitrary mix, but a type that just stores whatever comes from the system without further specifying it as either bytes or Unicode:
- If you want a string for displaying it, you first have to extract a string from that thing and there you optionally specify the encoding and error behaviour.
- If you want to append a string to it, it is automatically encoded in the default encoding, which obviously can fail.
- Similarly, e.g. globbing is done on the underlying representation's level, so "*.py" will first have to be converted according to the default encoding.
- If you just print it, you will get something that you can make out the decodable parts from, but it will probably be like "{Unicode:u'abcde'}" or "{bytes:b'ab\xf0\x0fcd'}".
- If you don't want to display it, but just want to pass it to the system, just use it as is.
Yes, this puts an inconvenience on application programmers that up to now always assumed that they received a list of strings from os.readdir(), but that's the way with false assumptions. In any case, they will be aware (from reading the docs) of what the problem is and why there is no way to return a text. Further, they will get tools to convert these paths or environment vars to texts, so it will be simply replacing "os.readdir()" with "map(to_unicode,os.readdir())".
Uli
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