[Python-Dev] Do I misunderstand how codecs.EncodedFile is supposed
Wed, 07 Aug 2002 09:46:55 +0200
Martin v. Loewis wrote:
> Skip Montanaro <firstname.lastname@example.org> writes:
>>I thought the whole purpose of the EncodedFile class was to provide
> """ Return a wrapped version of file which provides transparent
> encoding translation.
> Strings written to the wrapped file are interpreted according
> to the given data_encoding and then written to the original
> file as string using file_encoding. The intermediate encoding
> will usually be Unicode but depends on the specified codecs.
> Strings are read from the file using file_encoding and then
> passed back to the caller as string using data_encoding.
> If file_encoding is not given, it defaults to data_encoding.
> So, no. It provides transparent recoding: with a file encoding, and a
> data encoding.
> I never found this class useful.
It's not a class, just a helper for StreamRecoder. It's purpose
is to provide an easy way of saying "the inside world is encoding
X while the outside world uses Y":
# Make stdout translate Latin-1 output into UTF-8 output
sys.stdout = EncodedFile(sys.stdout, 'latin-1', 'utf-8')
# Have stdin translate UTF-8 input into Latin-1 input
sys.stdin = EncodedFile(sys.stdin, 'utf-8', 'latin-1')
Here the inside world uses Latin-1 while the outside world
You could also use it to talk to a gzipped file or, provided
you have such a codec, to an encrypted file.
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