Serhiy Storchaka added the comment:
> f'\\N{AMPERSAND}': reading a local variable looks like a typo or a security
> vulnerability, rather than a nice feature.
This can look as a typo, but how would you write this if this is not a typo?
f'\\N{AMPERSAND}' is legitimate syntax, and it would be weird to interpret this
expression in any other way than as '\\' + 'N' + format(AMPERSAND).
> What is the issue with having to write "\\{10}" to get "\\10" string? It's
> less error prone.
There is no issue with f'\\{10}'. There is an issue with f'\{10}'.
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<http://bugs.python.org/issue29104>
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