Nick Coghlan <ncogh...@gmail.com> added the comment:

Yeah, I was thinking about this a bit more and realised that I'd rejected the 
"quote everything by default" approach before I had the idea of providing a 
custom conversion specifier to disable the implicit string conversion and 
quoting.

So perhaps a better alternative would be:

  default - str + shlex.quote
  !u - unquoted (i.e. normal str.format default behaviour)

When you have a concise way to explicitly bypass it, making the default 
behaviour as safe as possible seems like a good way to go.

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<http://bugs.python.org/issue13238>
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