f-string anomaly
MRAB
python at mrabarnett.plus.com
Mon May 14 15:54:36 EDT 2018
On 2018-05-14 20:24, Lele Gaifax wrote:
> 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?
>
You need to look at the original post for the value of 'd':
class mydict(dict):
def __format__(self, template):
print('Template:', template)
return ', '.join(template.format(v, k=k, v=v) for k, v in
self.items())
d = mydict(bob='239-8402', ted='371-8567', carol='891-5810',
alice='552-2219')
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