[issue29568] undefined parsing behavior with the old style string formatting

[Xiang Zhang]

Xiang Zhang added the comment:

The documentation[1] explicitly states using % to do string format could be error-prone and recommends using str.format(). So +1 on no change in maintenance branches.

[1] https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting

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nosy: +xiang.zhang

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