How do you send part of a command to vim(in Ex mode) using if_py?

I'm trying to open a file on Ctrl-f. If the command is typed in the presence of an empty buffer 'None' then I want the file to be opened in that buffer, but if there is no empty buffer I'd like to open a new buffer using :tabnew and then open the file in that. For this purpose I have a function OpenFile which is invoked.

function! OpenFile()
python << EOF
import vim
import re
buffer = vim.current.buffer
name = str(
if re.match('None', name):
    vim.command(':e ')
    vim.command(':e ')

"Open file
 :map <C-f> :call OpenFile()<CR> 
:imap <C-f> <Esc>:call OpenFile()<CR>

vim.command executes the command so this is equivalent to :w!ENTER What I want to do is setup part of the command.. :e FILENAME ENTER

So I want to send the :e part in Ex mode via the python-function and get the user to type the filename and hit ENTER


First of all, why do you write this in Python? Sure, Vimscript is a bit strange (but since Vim 7 is has become a lot like Python), and you need to learn about the integration points, anyway, and this task has very little real logic in it.

This is easiest solved via a map-expression (:help map-expression):

:noremap <expr> <C-f> empty(bufname('')) ? ':edit ' : ':tabnew '

If you must, extract the conditional into a function and code it in Python, but I would recommend sticking to Vimscript, unless the logic is really complex or you could benefit from certain libraries.

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