[issue9723] Add shlex.quote

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Well, it's a micro-optimization (it would be interesting to benchmark, but not worth it).  I find the original code much more readable than the regex, but it doesn't matter all that much.  (And as far as optimization goes, using translate might be even faster.)

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