"Diez B. Roggisch" <de...@nospam.web.de> wrote in message
news:7p7328f3r1r2...@mid.uni-berlin.de...
Johannes Bauer schrieb:
> Hello group,
>
> with this following program:
>
> #!/usr/bin/python3
> import gzip
> x = gzip.open("testdatei", "wb")
> x.write("ä")
> x.close()
>
> I get a broken .gzip file when decompressing:
>
> $ cat testdatei |gunzip
> ä
> gzip: stdin: invalid compressed data--length error
>
> As it only happens with UTF-8 characters, I suppose the gzip module
UTF-8 is not unicode. Even if the source-encoding above is UTF-8, I'm not
sure what is used to encode the unicode-string when it's written.
> writes a length of 1 in the gzip file header (one character "ä"), but
> then actually writes 2 characters (0xc3 0xa4).
>
> Is there a solution?
What about writinga bytestring by explicitly decoding the string to utf-8
first?
x.write("ä".encode("utf-8"))
While that works, it still seems like a bug in gzip. If gzip.open is
replaced with a simple open:
# coding: utf-8
import gzip
x = open("testdatei", "wb")
x.write("ä")
x.close()
The result is:
Traceback (most recent call last):
File
"C:\dev\python3\Lib\site-packages\Pythonwin\pywin\framework\scriptutils.py",
line 427, in ImportFile
exec(codeObj, __main__.__dict__)
File "<auto import>", line 1, in <module>
File "y.py", line 4, in <module>
x.write("ä")
TypeError: must be bytes or buffer, not str
Opening a file in binary mode should require a bytes or buffer object.
-Mark
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