No shebang handling

[Atcold]

The conversion notebook to py script does not handle shebangs (commenting them out).
It is common (to me, at least) to create a new folder with ! mkdir my_dir instead of typing import os and os.mkdir('my_dir').
Therefore, I'd recommend to treat ! as % at the beginning of each line.

[mwouts]

Hello @Atcold , good remark! Well... I was not aware that there could be a space between the ! and the command. I will fix that when time permits, unless you want to add spaces to the RE yourself here.

Meanwhile, removing the space, or the ! altogether should work (as mkdir is among the magic commands).

[Atcold]

Hmm, anything following a ! is going to be a Bash command. Not sure there is any "magic" involved.
Oh, also for the ? I usually add a space after it, to make it nicer to read.