[issue12579] str.format_map raises a SystemError for non-mapping

[Julian]

Julian <Julian+Python.org at GrayVines.com> added the comment:

Fair enough. I suppose I take .format_map to mean, here is a mapping, call __getitem__ on it for each of the keys inside the format string, to which calling 12["foo"] would get me a TypeError.

I suppose I see both as appropriate, but the fact that it's implemented by passing the mapping as kwargs seemed less relevant. Less concerned about that part though I guess.

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