Avoid mutable default arguments
(Going through some pycharm warnings) Having mutable default arguments can be dangerous (https://docs.python-guide.org/writing/gotchas/), so I fixed that.
Didn't see anything dangerous though, but still.
(Going through some pycharm warnings) Having mutable default arguments can be dangerous (https://docs.python-guide.org/writing/gotchas/), so I fixed that.
Didn't see anything dangerous though, but still.