On 8/7/19, Steve Dower <steve.dower@python.org> wrote:
>
> * change the PyErr_SetExcFromWindowsErrWithFilenameObjects function to
> append (or chain) an extra message when either of the filenames contains c
> control characters (or change OSError to do it, or the default
> sys.excepthook)

On a related note for Windows, if the error is specifically
ERROR_INVALID_NAME, we could extend this to look for and warn about
the five reserved wildcard characters (asterisk, question mark, double
quote, less than, greater than), pipe, and colon. It's only sometimes
the case for colon because it's allowed in device names and used as
the name and type delimiter for stream names.

Kernel object names don't reserve wildcard characters, pipe, and
colon. So I wouldn't want anything but the control-character warning
if it's say ERROR_FILE_NOT_FOUND. An example would be
SharedMemory(name='Global\test'), or a similar error for registry key
and value names such as OpenKey(hkey, 'spam\test'), that is if winreg
were updated to include the name in the exception. Note that forward
slash is just a name character in these cases, not a path separator,
so we have to use backslash, even if just via replace('/', '\\').
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