[issue9723] Add shlex.quote

[R. David Murray]

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

You aren't using a regex to replace the quotes, either.

>>> len('abcd'.translate(str.maketrans('', '', string.ascii_letters ))) > 0
False

I don't know if this is faster than the corresponding search regex, but depending on how much overhead regex has, it might be.  Note that the translate table can be pre-built, just like the compiled regex.

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