Op 23/10/2021 om 03:22 schreef Stefan Ram:
> Paulo da Silva <p_d_a_s_i_l_v_a...@nonetnoaddress.pt> writes:
>> Well, I didn't follow the discussion of this new feature, but the reason
>> I can see behind allowing it seems so valid for for ctr:=ctr-1 as for
>> self.ctr:=self.ctr-1. The kind of use is exactly the same. One is for a
>> normal function, the other for a method.
> The intention of the introduction of the assignment expression
> was to allow grab the values of subexpressions so as to be able
> to later use these value. This can be done with an identifier:
>
> if env_base := os.environ.get( "PYTHONUSERBASE", None ):
> return env_base
>
> . I am wondering what use cases are there for having something
> different than an identifier on the left side.
Well I have the following use case:
while (temp_result := calculate_next_couple(a, b))[1]:
a, b = temp_result
more calculations
Which IMO would be clearer if I could just write:
while ((a, b) := calculate_next_couple(a,b))[1]:
more calculations
Of course it would even more clear if I could write something like:
while (a, b) := calculate_next_couple(a, b); b:
more calculations
or
do:
a, b = calculate_next_couple(a, b)
while b:
more calculations
--
Antoon.
--
https://mail.python.org/mailman/listinfo/python-list
