bug#30750: 25.3; New Python3.6 f-string syntax highlighting support (feature request)

[Campbell Barton]

In python 3.6, code can be evaluated in a string, called an f-string,
see: https://www.python.org/dev/peps/pep-0498/

It would be nice if python-mode would not syntax highlight the code in
the f-string as a string, and instead use regular syntax highlighting.

eg:

    print(f'Test {} me!'.format(2 + 2))

can be written as:

    print(f'Test {2 + 2} me!')

I noticed php-mode (which had something like this for many years)
does for for PHP's strings, eg: "Test {$2 + 2} me!"

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It was recommended I send in a feature request:
see: https://emacs.stackexchange.com/questions/39283

Thanks