Welcome to the vim-cute-python wiki!

This function was provided by sethwoodworth and will turn concealing on/off:

function! ToggleConceal()
 if &conceallevel != '0'
 set conceallevel=0
 echo "ConcealLevel off"
 else
 set conceallevel=2
 echo "ConcealLevel on"
 endif
endfunction

You can then bind this to a key, e.g. F4:

nnoremap <F4> :call ToggleConceal()

mattharrison/pretty-mode/blob/emacswiki/pretty-mode.el has more fun symbols. I have tried to find a good balance suitable for python in vim-cute-python, so not all of these are included.