Evaluation of variable as f-string

[Christian Gollwitzer]

Am 28.01.23 um 02:56 schrieb Thomas Passin:
> On 1/27/2023 5:10 PM, Christian Gollwitzer wrote:
>> Am 27.01.23 um 21:43 schrieb Johannes Bauer:
>>> I don't understand why you fully ignore literally the FIRST example I 
>>> gave in my original post and angrily claim that you solution works 
>>> when it does not:
>>>
>>> x = { "y": "z" }
>>> s = "-> {x['y']}"
>>> print(s.format(x = x))
>>> Traceback (most recent call last):
>>>    File "<stdin>", line 1, in <module>
>>> KeyError: "'y'"
>>>
>>> This. Does. Not. Work.
>>
>> It's because "you're holding it wrong!". Notice the error message; it 
>> says that the key 'y' does not exist.
>>
>>
>> (base) Apfelkiste:Abschlussmeeting chris$ ipython
>> Python 3.8.8 (default, Apr 13 2021, 12:59:45)
>> Type 'copyright', 'credits' or 'license' for more information
>> IPython 7.22.0 -- An enhanced Interactive Python. Type '?' for help.
>>
>> In [1]: x = { "y": "z" }
>>
>> In [2]: s = "-> {x[y]}"
>>
>> In [3]: print(s.format(x = x))
>> -> z
>>
>> In [4]:
>>
>>      Christian
> 
> Oops, that's not quite what he wrote.
> 
> You: s = "-> {x[y]}"    # Works
> Him: s = "-> {x['y']}"  # Fails
> 
You might want to reconsider why I could have possibly written this 
message....

       Christian