Serhiy Storchaka added the comment:
> I am also not clear on the relation between the UnicodeDecodeError and tuple
> splitting. Does '_flatten((self._w, cmd)))' call split or splitlist on the
> tuple arg? Is so, do you know why a problem with that would lead to the
> UDError? Does your patch fix the leading '0' regression?
The traceback is misleading. Full statement is:
for x in self.tk.split(
self.tk.call(_flatten((self._w, cmd)))):
Where cmd is ('entryconfigure', index). The UnicodeDecodeError error was raised
neither by _flatten() nor call(), but by split().
When run `./python -m idlelib.idle \\0.py` call() returns and split() gets a
tuple of tuples: (('-activebackground', '', '', '', ''), ('-activeforeground',
'', '', '', ''), ('-accelerator', '', '', '', ''), ('-background', '', '', '',
''), ('-bitmap', '', '', '', ''), ('-columnbreak', '', '', 0, 0), ('-command',
'', '', '', '3067328620open_recent_file'), ('-compound', 'compound',
'Compound', <index object: 'none'>, 'none'), ('-font', '', '', '', ''),
('-foreground', '', '', '', ''), ('-hidemargin', '', '', 0, 0), ('-image', '',
'', '', ''), ('-label', '', '', '', '1 /home/serhiy/py/cpython/\\0.py'),
('-state', '', '', <index object: 'normal'>, 'normal'), ('-underline', '', '',
-1, 0)). When set wantobjects in Lib/tkinter/__init__.py to 0, it will get a
string r"{-activebackground {} {} {} {}} {-activeforeground {} {} {} {}}
{-accelerator {} {} {} {}} {-background {} {} {} {}} {-bitmap {} {} {} {}}
{-columnbreak {} {} 0 0} {-command {} {} {} 3067013228open_recent_file}
{-compound comp
ound Compound none none} {-font {} {} {} {}} {-foreground {} {} {} {}}
{-hidemargin {} {} 0 0} {-image {} {} {} {}} {-label {} {} {} {1
/home/serhiy/py/cpython/\0.py}} {-state {} {} normal normal} {-underline {} {}
-1 0}". Then split() try recursively split its argument. When it splits '1
/home/serhiy/py/cpython/\\0.py' it interprets '\\0' as backslash substitution
of octal code 0 which means a character with code 0. Tcl uses modified UTF-8
encoding in which null code is encoded as b'\xC0\x80'. This bytes sequence is
invalid UTF-8. That is why UnicodeDecodeError was raised (patch for issue13153
handles b'\xC0\x80' more correctly). When you will try '\101.py', it will be
translated by split() to 'A.py'.
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<http://bugs.python.org/issue19020>
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