Samuel Colvin added the comment:

I see, I hadn't appreciated fstrings where entirely different and more powerful 
than format(), I'll close this.

For anyone else coming to this, with fstrings in >=3.6 you can do:

In [4]: value = [1,2, 3]

In [5]: f'The value is {value}.'
Out[5]: 'The value is [1, 2, 3].'

In [6]: f'The value is {len(value)}.'
Out[6]: 'The value is 3.'

----------
resolution:  -> fixed
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28904>
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