Gregory P. Smith 683ab85955 bpo-38693: Use f-strings instead of str.format() within importlib (#17058) ...

This is a small performance improvement, especially for one or two hot
places such as _handle_fromlist() that are called a lot and the
.format() method was being used just to join two strings with a dot.

Otherwise it is merely a readability improvement.

We keep `_ERR_MSG` and `_ERR_MSG_PREFIX` as those may be used elsewhere for canonical looking error messages.

2022-10-06 16:43:16 -07:00

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