How to transform command into keymap

In my .vimrc, I have the following command definition:

command! -range Runit <line1>,<line2> python3 RunLine(<line1>, <line2>)

and it works fine.

I'd like to have it as keymap.

I tried several ways to

noremap <F2> :call

the function with arguments but no result. Maybe someone can point me to a solution.