Steve Dower <steve.do...@python.org> added the comment:

The closing parentheses are needed - a PR would be appreciated for that.

The quotes around a variable reference are unnecessary. At a parser level, it 
just changes it from a variable reference to a string literal with 
substitutions (unlike most shells, which do a textual substitution before 
parsing).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40158>
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