[issue35168] shlex punctuation_chars inconsistency

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

Thanks for the report. The code was added with c1f974c944a3e73cbc9102356d8700a190dcafb3 and self._pushback_chars is declared only when punctuation_chars is passed to shlex.shlex in the constructor as you have mentioned in https://github.com/python/cpython/blob/master/Lib/shlex.py#L59 . Adding Vinay for thoughts on the usage.

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nosy: +vinay.sajip, xtreak

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<https://bugs.python.org/issue35168>
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