On Monday, June 27, 2016 at 1:40:35 PM UTC-5, Viktor Ransmayr wrote:
Leo 5.3 was working fine for me for quite some time.
>
> Without any (known) changes Leo stopped working :-(
>
Happily, I think we can say, the same thing just happened to me when I
installed Python 3.5.2 on Anaconda 4.2.0 on my Win 10 laptop. This was a
pretty clean install: I uninstalled lots of old pythons first.
Rev 2e1137 works around this problem in an inelegant, but probably
completely safe way.
Here are the relevant tracebacks
>
[Snip]
File "C:\Users\Viktor\Programs\leo53\leo\core\leoGlobals.py", line 5910,
in os_path_finalize
path = os.path.abspath(path)
File "C:\Python35\lib\ntpath.py", line 535, in abspath
path = _getfullpathname(path)
ValueError: _getfullpathname: embedded null character
Googling the exact error message (ValueError: _getfullpathname: embedded
null character) yielded this page
<http://stackoverflow.com/questions/34004063/error-on-import-matplotlib-pyplot-on-anaconda3-for-windows-10-home-64-bit-pc>.
QQQ
This is a bug in python, not matplotlib. The issue is that winreg.EnumValue
is not cutting string values at their length properly for some reason, and
strings will include null characters which os.path.abspath is not able to
process.
QQQ
It appears this bug has been around for a long time. Otoh, it only bites
on one of my Windows 10 machines. Pretty mysterious.
The fix is to strip null characters from paths in various places:
path = path.replace('\x00','') # Fix Python 3 bug on Windows 10.
In an emergency, this kind of code can be applied right at the point of the
crash, in this case, C:\Python35\lib\ntpath.py.
I am glad to be able to acknowledge this problem properly. It takes quite a
bit of maintenance just to keep pace with *new* python bugs.
Edward
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