f-string anomaly

Mon May 14 15:24:23 EDT 2018

Ken Kundert <theNurd at nurdletech.com> writes:
> Lele,
> I'm afraid I was unclear. The ... in the code snippet was intended
> to imply that these lines were appended to the end of the original code,
> where d was defined.

Ok, but then I get a different behaviour:
 Python 3.6.5 (default, May 11 2018, 13:30:17) 
 [GCC 7.3.0] on linux
 Type "help", "copyright", "credits" or "license" for more information.
 >>> k=1
 >>> v=2
 >>> d=3
 >>> print(f'Email: {d:{{k}} {{v}}}')
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 ValueError: Invalid format specifier
Which Python version are you using?
ciao, lele.
-- 
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele at metapensiero.it | -- Fortunato Depero, 1929.