naming convention for functions that mutate their arguments?

[Terry Reedy]

"mike p." <a at b.c> wrote in message news:c1lgcf$m00$1 at aplcore.jhuapl.edu...
> Hi all,
>
> I was wondering if there was any official/recommended way to denote that
a
> Python function may mutate one or more of its arguments?

The list mutation methods all return None to remind of this.  Otherwise,
read doc strings.

Terry J. Reedy