[issue12579] str.format_map raises a SystemError for format strings with positional arguments

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

I definitely agree it should be a ValueError.

How about including in your patch adding your name to Misc/ACKS, if it isn't already there? I don't have your full name.

I might play with the exception wording and add a few more comments. Thanks for your work on this.

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stage:  -> patch review

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<http://bugs.python.org/issue12579>
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