I think it's too much effort for too little gain.
The motivation feels very weak; surely writing
os.system("echo " + message_from_user)
is just as easy (as is the %s spelling), so the security issue can hardly
be blamed on PEP 498.
I also don't think that the current way to address such security issues is
a big deal:
- The subprocess module is complex for other reasons, and a simpler wrapper
could easily be made;
- Database wrappers have forever included their own solution for safely
quoting query parameters, and people who still don't use that are not
likely to care about i-strings either.
- Logging: again, it's hard to beat the existing solution, which mostly
comes down to using %r instead of %s for any user-supplied or otherwise
unverified data.
- HTML quoting is an art and I'm skeptical that the proposal will even work
for that use case.
--
--Guido van Rossum (python.org/~guido)
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