On 07Aug2019 0247, Chris Angelico wrote:
On Wed, Aug 7, 2019 at 7:33 PM Steven D'Aprano <st...@pearwood.info> wrote:
What's the rush? Let's be objective here: what benefit are we going to
get from this change? Is there anyone hanging out desperately for "\d"
and "\-" to become SyntaxErrors, so they can... do what?
So that problems can start to be detected. Time and again, Python
users on Windows get EXTREMELY confused by the way their code worked
perfectly with one path, then bizarrely fails with another. That is a
very real problem, and the problem is that it appeared to work when
actually it was wrong.
[...]
If you can offer a better plan, then by all means, do so. But
deferring without a change is of no real value, and it means ANOTHER
eighteen months added onto the time before novice programmers get to
be told about string literal problems.
Allow me to offer one:
* change the SyntaxWarning into a default-silenced one that fires every
time a .pyc is loaded (this is the hard part, but it's doable)
* change pathlib.PureWindowsPath, os.fsencode and os.fsdecode to
explicitly warn when the path contains control characters
* change the PyErr_SetExcFromWindowsErrWithFilenameObjects function to
append (or chain) an extra message when either of the filenames contains
control characters (or change OSError to do it, or the default
sys.excepthook)
I don't care whether the changes are applied to all platforms rather
than just Windows, but since Windows developers hit the problem and
(some) Linux developers like to use control characters in filenames, I
can see a justification for only warning on Windows.
Long term we can still deprecate and eventually block unrecognized
escape sequences, but the long standing behaviour can stand for a few
more years without creating more harm.
Cheers,
Steve
_______________________________________________
Python-Dev mailing list -- python-dev@python.org
To unsubscribe send an email to python-dev-le...@python.org
https://mail.python.org/mailman3/lists/python-dev.python.org/
Message archived at
https://mail.python.org/archives/list/python-dev@python.org/message/2ICLCF5T53DBPVZPVHMT2XTXL64QF7WW/
