I think you're talking about call-by-reference (Google it).
What would be your use case?
Do you know you can return multiple values from a function using a tuple?
E.g.
def foo():
return 3, 42
x, y = foo()
print(x) # 3
print(y) # 42
--Guido
On Mon, Aug 26, 2019 at 5:57 AM HUANG YUWEI <lelouchk...@gmail.com> wrote:
> Dear Python community,
>
> I am a heavy python user in numerical simulation.
>
> In python 3.8, we will have a new syntax `:=` that could assign values to
> variables as part of larger expression like,
>
> ```
>
> if (n:=len(a)) > 10:
>
> ....
>
> ```
>
> On the other hand, I also think that it would be useful if `:=` could be
> used in function argument, so that a local variable created inside a
> function could be returned **optionally**, for example,
>
> ```
>
> def func(arg1, arg2, karg1=karg1_default, karg_return:=karg_return):
>
> ...
>
> karg_return = 3
>
> ...
>
> return func_output
>
>
> # normal calling of func() without returning variable karg_return
>
> # in this way, karg_return:=karg_return is not used and karg_return is
> only simply a local variable in func()
>
> output = func(2,3,karg1=4)
>
>
> # calling func() with using the karg_return argument
>
> # in this way, value of the local variable karg_return in func() is
> created and "passed" to variable a
>
> output = func(2,3,karg1=4,a:=karg_return)
>
> print(a) # a = 3
>
> ```
>
>
> Is it possible to add this new feature?
>
>
> Thanks for your attention to this matter.
>
> Huang Y.W.
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--
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him/his **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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