Using Python in vimscript: How to export a value from a python script back to vim?

Question

I'm struggling with Python in vim. I still haven't found out how I can import a value from a python script (in a vim function) back to vim p.e. ``` function! myvimscript() python << endpython import vim, random, sys s = vim.eval("mylist") # do operation with variable "s" in python endpython " import variable "s" from above " do operation with "s" in vimscript endfunction ``` 1) How can I use `"s"` again in vim (how can I import `"s"` from the python code back to vim)? I can't find out as well how to use vim.current.buffer with a selection. ``` function! myvimscript() let startline = line("'<") let endline = line("'>") python << endpython start = vim.eval("startline") end = vim.eval("endline") cb = vim.current.buffer l = cb[start:end] endpython endfunction ``` 2) How can I assign the dynamic value `"start"` and `"end"` to `"l"`

Accepted Answer

First of all, please define your function name starting with uppercase.

Here is an example for your two questions. I hope it helps:

```
function! TestPy() range

let startline = line("'<")
    let endline = line("'>")
    echo "vim-start:".startline . " vim-endline:".endline
python << EOF
import vim
s = "I was set in python"
vim.command("let sInVim = '%s'"% s)
start = vim.eval("startline")
end = vim.eval("endline")
print "start, end in python:%s,%s"% (start, end)
EOF
    echo sInVim
endfunction
```

first I paste the output of a small test: I visual selected 3,4,5, three lines, and `:call TestPy()`

The output I had:

```
vim-start:3 vim-endline:5
start, end in python:3,5
I was set in python
```

So I explain the output a bit, you may need to read the example function codes a little for understanding the comment below.

```
vim-start:3 vim-endline:5   #this line was printed in vim,  by vim's echo.
start, end in python:3,5    # this line was prrinted in py, using the vim var startline and endline. this answered your question two.
I was set in python         # this line was printed in vim, the variable value was set in python. it answered your question one.
```

I added a `range` for your function. because, if you don't have it, for each visual-selected line, vim will call your function once. in my example, the function will be executed 3 times (3,4,5). with range, it will handle visualselection as a range. It is sufficient for this example. If your real function will do something else, you could remove the `range`.

With `range`, better with `a:firstline and a:lastline`. I used the `line("'<")` just for keep it same as your codes.

EDIT with list variable:

check this function:

```
function! TestPy2()
python << EOF
import vim
s = range(10)
vim.command("let sInVim = %s"% s)
EOF
    echo type(sInVim)
    echo sInVim
endfunction
```

if you call it, the output is:

```
3
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
```

the "3" means type list (check type() function). and one line below is the string representation of list.

Using Python in vimscript: How to export a value from a python script back to vim?

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