gh-142037: Improve error messages for printf-style formatting #142081
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This affects string formatting as well as bytes and bytearray formatting. * For errors in the format string, always include the position of the start of the format unit. * For errors related to the formatted arguments, always include the number or the name of the argument. * Suggest more probable causes of errors in the format string (stray %, unsupported format, unexpected character). * Provide more information when the number of arguments does not match the number of format units. * Raise more specific errors when access of arguments by name is mixed with sequential access and if * is used with a mapping. * Add tests for some uncovered cases.
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This affects string formatting as well as bytes and bytearray formatting.
%-formats #142037