[issue6517] configparser: add possibility to escape formatstrings

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. <fdrake at acm.org> added the comment:

We're in agreement; I was specifically adding weight to *not*
selecting the second optoin Łukasz Langa presented:

> 2. We deprecate ConfigParser in the code and in the documentation.

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<http://bugs.python.org/issue6517>
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