str.maketrans in python3 is able to accept just one argument which is a
mapping of translations.
While bytearray and bytes are still using only old way where you should
pass two iterables from and to.

static str.maketrans(x [,y [,z]])
static bytes.maketrans(from, to)
static bytearray.maketrans(from, to)

On Tue, Sep 26, 2017 at 6:12 PM, Serhiy Storchaka <report@bugs.python.org>
wrote:

>
> New submission from Serhiy Storchaka:
>
> Could you please provide more information? What the problem you want to
> solve?
>
> ----------
> nosy: +serhiy.storchaka
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <https://bugs.python.org/issue31594>
> _______________________________________
>