unexpected keyword argument 'encoding'

[corower]

probably you need some more info, besides this? (system is debian 9 (stretch) updated to latest available)

Traceback (most recent call last):
File "./zpool-iostat-viz", line 290, in
raise exc
File "./zpool-iostat-viz", line 279, in
curses.wrapper(lambda window: main(window, parsed_args["diff"], parsed_args["parts"], parsed_args["file"], parsed_args["by"] or "m"))
File "/usr/lib/python3.5/curses/init.py", line 94, in wrapper
return func(stdscr, *args, **kwds)
File "./zpool-iostat-viz", line 279, in
curses.wrapper(lambda window: main(window, parsed_args["diff"], parsed_args["parts"], parsed_args["file"], parsed_args["by"] or "m"))
File "./zpool-iostat-viz", line 241, in main
render_stats(window, transformation_function, should_show_differential, pool, filename)
File "./zpool-iostat-viz", line 132, in render_stats
stats = transform(get_stats(pool, filename))
File "./zpool-iostat-viz", line 65, in get_stats
zpool_cmd = subprocess.run(["zpool", "iostat", "-wvHp", "--"] + (pool_names if pool_names else []), check=True, stdout=subprocess.PIPE, encoding="UTF-8")
File "/usr/lib/python3.5/subprocess.py", line 383, in run
with Popen(*popenargs, **kwargs) as process:
TypeError: init() got an unexpected keyword argument 'encoding'