On Thu, Sep 17, 2020 at 9:27 PM Ricky Teachey <ri...@teachey.org> wrote:
>
> On Thu, Sep 17, 2020 at 2:57 PM Brendan Barnwell <brenb...@brenbarn.net>
> wrote:
>
>> On 2020-09-16 21:52, Dennis Sweeney wrote:
>> > TL;DR: I propose the following behavior:
>> >
>> > >>> s = "She turned me into a newt."
>> > >>> f"She turned me into a {animal}." = s
>> > >>> animal
>> > 'newt'
>> >
>> > >>> f"A {animal}?" = s
>> > Traceback (most recent call last):
>> > File "<pyshell#2>", line 1, in <module>
>> > f"A {animal}?" = s
>> > ValueError: f-string assignment target does not match 'She turned
>> me into a newt.'
>> >
>> > >>> f"{hh:d}:{mm:d}:{ss:d}" = "11:59:59"
>> > >>> hh, mm, ss
>> > (11, 59, 59)
>>
>
> A difficulty I have with the idea as presented is this.
>
> If I can say this:
>
> "{x:d} {y:d} {z:d}" = "1 2 3"
>
> ...thus assigning 1, 2, 3 to x, y, z respectively, I might want to also do
> the same thing this way:
>
> q = "{x:d} {y:d} {z:d}"
> q = "1 2 3"
>
> The intent being: save the f-string as a variable, and then use it to
> assign later. But that can obviously never work because q would just become
> the string "1 2 3" .
>
The same problem exists for assignments to tuples, subscripts, attributes,
even plain variables. I've often wanted to put an assignment target in a
variable.
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