| msg88060 - (view) |
Author: Χρήστος Γεωργίου (Christos Georgiou) (tzot) * |
Date: 2009-05-19 00:21 |
| Add 'cp65001' (Microsoft term for UTF-8) as an alias to 'utf_8' |
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| msg96065 - (view) |
Author: Marc-Andre Lemburg (lemburg) *  |
Date: 2009-12-07 18:57 |
| Could you provide some official reference defining the alias ? Thanks. |
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| msg96066 - (view) |
Author: Marc-Andre Lemburg (lemburg) * |
Date: 2009-12-07 19:07 |
| Nevermind, I found this reference: http://msdn.microsoft.com/en-us/library/system.text.encoding(VS.80).aspx Looks like we could add a few more aliases for other encodings as well. |
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| msg96076 - (view) |
Author: Martin v. Löwis (loewis) * |
Date: 2009-12-07 21:19 |
| > http://msdn.microsoft.com/en-us/library/system.text.encoding(VS.80).aspx > > Looks like we could add a few more aliases for other encodings as well. I wouldn't trust this table. Microsoft is on record of implementing the code pages with slight variations compared to other references for some encodings (in particular the Asian ones). So unless there is an actual documented need for a certain alias (and preferably a demonstration that Microsoft's interpretation of the code page is the same as Python's), I would advise against adding such aliases. |
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| msg96077 - (view) |
Author: Marc-Andre Lemburg (lemburg) * |
Date: 2009-12-07 21:41 |
| Martin v. Löwis wrote: > > Martin v. Löwis <martin@v.loewis.de> added the comment: > >> http://msdn.microsoft.com/en-us/library/system.text.encoding(VS.80).aspx >> >> Looks like we could add a few more aliases for other encodings as well. > > I wouldn't trust this table. Microsoft is on record of implementing the > code pages with slight variations compared to other references for some > encodings (in particular the Asian ones). So unless there is an actual > documented need for a certain alias (and preferably a demonstration that > Microsoft's interpretation of the code page is the same as Python's), > I would advise against adding such aliases. Fair enough. Could someone with some IronPython/.NET foo check whether the code pages are the same as the Python codecs ? The above page has some sample code to get started and IronPython provides easy access to both the .NET codecs and the Python ones. Thanks, -- Marc-Andre Lemburg eGenix.com ________________________________________________________________________ ::: Try our new mxODBC.Connect Python Database Interface for free ! :::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/ |
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| msg96080 - (view) |
Author: Marc-Andre Lemburg (lemburg) * |
Date: 2009-12-07 22:41 |
| Here's a script for IronPython 2.6 that checks a few encoders. Since IronPython doesn't appear to come with the full set of Python codecs and it's also not clear whether the implemented codecs actually match the default Python ones, I'm not sure how reliable this output is. It's probably better to dump the encoded data to a file and compare against a CPython run. Anyway, here's the output: Code Page 65000 vs. encoding 'utf-7' 0 errors Code Page 65001 vs. encoding 'utf-8' 0 errors Code Page 1200 vs. encoding 'utf-16-le' 0 errors Code Page 1201 vs. encoding 'utf-16-be' 0 errors Code Page 28591 vs. encoding 'iso-8859-1' 0 errors |
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| msg96758 - (view) |
Author: Antoine Pitrou (pitrou) * |
Date: 2009-12-21 16:26 |
| (I tried running your script under IronPython 2.6 with Mono but I got a bunch of errors; since I don't know IronPython at all I can't really investigate) |
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| msg96796 - (view) |
Author: Stefan Krah (skrah) * |
Date: 2009-12-22 13:24 |
| I wrote a small C application that converts all possible wchar_t to multibyte strings, using code page 65001. Usage: cl.exe gen65001.c python check65001.py Except for the newline character and a sequence from 55296-57343, this code page matches UFT-8. Note, however, that cp65001 is a pseudo code page: http://www.postgresql.org/docs/faqs.FAQ_windows.html#2.6 For instance, setlocale will not work: http://blogs.msdn.com/michkap/archive/2006/03/13/550191.aspx |
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| msg96807 - (view) |
Author: Martin v. Löwis (loewis) * |
Date: 2009-12-22 18:59 |
| This report is really about the issues reported in #1602 and #7441, i.e. where console output fails if the terminal encoding is 65001. Rather than adding the alias, I would prefer to find out why terminal output fails in that code page. |
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| msg96809 - (view) |
Author: Χρήστος Γεωργίου (Christos Georgiou) (tzot) * |
Date: 2009-12-22 19:23 |
| re Martin's question, I can offer the indirect wisdom of Michael Kaplan in this blog post: http://blogs.msdn.com/michkap/archive/2008/03/18/8306597.aspx where he mentions that the easiest way to output unicode text in the Windows console, is: int main(void) { _setmode(_fileno(stdout), _O_U16TEXT); wprintf(L"\x043a\x043e\x0448\x043a\x0430 \x65e5\x672c\x56fd\n"); return 0; } _setmode being the special call needed. I haven't tested with any _O_U8TEXT (if such a thing exists), I don't do Windows anymore, therefore I can't provide a patch. It also seems that Python —when stdin/stdout/stderr is under control of a Windows console— doesn't use plain *printf functions. The example code I offered in one of the other issues (dumb stdout doing plain .write as UTF-8) runs and displays fine. |
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| msg96815 - (view) |
Author: Martin v. Löwis (loewis) * |
Date: 2009-12-22 21:16 |
| I also wonder whether stdin/stdout/stderr should be streams on Windows that use WriteConsole instead of WriteFile. Then the entire issue of console CP would go away for Unicode output. |
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| msg97731 - (view) |
Author: Marc-Andre Lemburg (lemburg) * |
Date: 2010-01-13 19:15 |
| I created two scripts for exporting the IronPython findings and checking them in CPython. These are the results: Checking code Page 28591 against encoding 'iso-8859-1' using file 'iso-8859-1.map' 0 errors Checking code Page 28592 against encoding 'iso-8859-2' using file 'iso-8859-2.map' 0 errors Checking code Page 28593 against encoding 'iso-8859-3' using file 'iso-8859-3.map' 0 errors Checking code Page 28594 against encoding 'iso-8859-4' using file 'iso-8859-4.map' 0 errors Checking code Page 28595 against encoding 'iso-8859-5' using file 'iso-8859-5.map' 0 errors Checking code Page 1201 against encoding 'utf-16-be' using file 'utf-16-be.map' 2048 errors Checking code Page 1200 against encoding 'utf-16-le' using file 'utf-16-le.map' 2048 errors Checking code Page 65000 against encoding 'utf-7' using file 'utf-7.map' 21 errors Checking code Page 65001 against encoding 'utf-8' using file 'utf-8.map' 2048 errors Result: We can add aliases for the various ISO mappings, but not for the UTF ones. .NET encodes the surrogates differently than Python's codecs and it also produces different results for UTF-7 than Python's codec. |
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| msg97732 - (view) |
Author: Marc-Andre Lemburg (lemburg) * |
Date: 2010-01-13 19:18 |
| What we could do is add new codecs based on the .NET tables for cp65000 et al. However, before doing this, I'd like to know where these code page settings can occur and what exact names are used for them. If they only appear in .NET and IronPython, I don't think it's worth adding extra codecs for the MS UTF variants. |
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| msg106274 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2010-05-22 00:03 |
| Would it be possible to implement a "cp65001" codec in Python using MultiByteToWideChar() / WideCharToMultiByte() with codepage=CP_UTF8? |
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| msg119440 - (view) |
Author: David-Sarah Hopwood (davidsarah) |
Date: 2010-10-23 16:10 |
| This problem causes {{{os.getcwdu()}}} to fail when the console code page is set to 65001 (always, I think): {{{ t:\>ver Microsoft Windows [Version 6.0.6002] t:\>chcp Active code page: 65001 t:\>python -c "import os; print os.getcwdu()" Traceback (most recent call last): File "", line 1, in LookupError: unknown encoding: cp65001 t:\>chcp 1252 Active code page: 1252 t:\>python -c "import os; print os.getcwdu()" t:\ }}} Incidentally, I don't agree that this codepage needs to be distinguished from UTF-8. The deviations in the Microsoft codec are just their bugs. There is only one correct way to encode/decode UTF-8, and cp65001 is supposed to be UTF-8 according to Microsoft (e.g. http://msdn.microsoft.com/en-us/library/86hf4sb8%28en-US,VS.80%29.aspx ). |
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| msg119441 - (view) |
Author: David-Sarah Hopwood (davidsarah) |
Date: 2010-10-23 16:13 |
| I said: "There is only one correct way to encode/decode UTF-8". This is true modulo differences in the treatment of initial byte order marks. |
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| msg119444 - (view) |
Author: David-Sarah Hopwood (davidsarah) |
Date: 2010-10-23 16:25 |
| I meant to say that the os.getcwdu() test in was done with Windows native Python 2.6.2. |
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| msg119447 - (view) |
Author: David-Sarah Hopwood (davidsarah) |
Date: 2010-10-23 16:40 |
| Oops, false alarm. python -c "import os; print repr(os.getcwdu())" works as expected, so the exception is part of issue 1602. (My command about there being no need to distinguish this codepage from UTF-8 stands.) |
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| msg120712 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2010-11-08 04:11 |
| Different tests proved that cp65001 can *not* be set as an alias to utf-8, and that's why I'm closing this issue. Anyway, I don't think that cp65001 is configured by default on any Windows setup. It is only set by the user, using the chcp command, to try to display unicode characters in the Windows console: but it is not possible to display any unicode character in this console (see issue #1602). And chcp command should not be used in the Windows console because it does not only change the ANSI code page: it changes also the console code page, which is wrong (the console still expect text encoded to the previous code page). It is possible to implement a codec for cp65001 using utf-8 existing codec in surrogatepass mode, or by using MultiByteToWideChar() / WideCharToMultiByte() with codepage=CP_UTF8. But I don't think that we need cp65001 at all. If you need cp65001 for a good reason and you would like to implement a cp65001 Python codec, open a new issue. If you consider that we should use _O_U8TEXT or _O_U16TEXT, open another new issue. _O_U8TEXT or _O_U16TEXT might improve unicode support if Python output is redirected to a pipe, but I don't think that it would help to display unicode character in the Windows console. I also fear that it breaks existing code and any function not aware of this special mode. |
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| msg146467 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2011-10-26 23:48 |
| I added a cp65001 codec to Python 3.3: see issue #13216. |
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