Lele,
I am using Python3.6. d has to be an object of mydict.
Here is the code that exhibits the problem:
import sys, os
from inform import error, os_error
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')
print('Using format():')
print('Email: {0:{{k}}: {{v}}}'.format(d))
print()
print('Using f-string:')
print(f'Email: {d:{{k}} {{v}}}')
print()
print('Using f-string:')
k=6
v=9
print(f'Email: {d:{{k}} {{v}}}')
The result is:
NameError: name 'k' is not defined
-Ken
On 05/14/2018 12:24 PM, Lele Gaifax wrote:
> Ken Kundert <then...@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.
>
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