On 12/6/2013 12:45 PM, Thomas Kluyver wrote:
On 6 December 2013 04:55, Joel B. Mohler <jmoh...@gamry.com <mailto:jmoh...@gamry.com>> wrote:

    C:\Python27\lib\site-packages\matplotlib\__init__.py in Verbose()
    --> 252     for arg in map(six.u, sys.argv[1:]):
    C:\Python27\lib\site-packages\six.pyc in u(s)
    --> 468         return unicode(s, "unicode_escape")
    UnicodeDecodeError: 'unicodeescape' codec can't decode bytes in
    position
    2-3: truncated \UXXXXXXXX escape


I'll bet that one of the arguments starts with C:\Users. It looks like six.u() can't be applied to arbitrary input (it's intended for literals).

Indeed, I suspect you are exactly right. After pondering the transcript below, I think it is bad idea to apply six.u to any sort of relatively unknown input. In any case, I believe this effectively breaks matplotlib in the IPython notebook on windows and other very simple things. Behold:

C:\>python -c "import matplotlib" any_old_thing_with_\u_in_it
Traceback (most recent call last):
  File "<string>", line 1, in <module>
File "c:\python27\lib\site-packages\matplotlib\__init__.py", line 240, in <module>
    class Verbose:
File "c:\python27\lib\site-packages\matplotlib\__init__.py", line 252, in Verbose
    for arg in map(six.u, sys.argv[1:]):
  File "c:\python27\lib\site-packages\six.py", line 468, in u
    return unicode(s, "unicode_escape")
UnicodeDecodeError: 'unicodeescape' codec can't decode bytes in position 19-20: truncated \uXXXX escape

It seems to me that this changeset needs to be rolled back, but I don't clearly see the problem that it was intended to fix.

Joel

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