Re: Evaluate current line in Python mode?

[Xah Lee]

On Aug 28, 12:45 pm, Michael Hannon <jm_han...@yahoo.com> wrote:
> Greetings.  I use Emacs for, among other things, running Python code and R
> code.  In both modes (Python and ESS "Emacs Speaks Statistics") there is a
> function bound to the sequence:
>
>     C-c C-n
>
> Both functions advance to the next line of code in the buffer, i.e., skipping
> blank lines, comment lines, etc.
>
> In ESS mode the function bound to C-c C-n also (by default) sends the current
> line to R for evaluation.  I find this to be very convenient as a way to watch
> calculations "evolve".
>
> It's possible to do something similar in Python mode by selecting the
> current line and then sending the region (C-c C-r) to Python for evaluation,
> but this is a bit cumbersome.
>
> Can anybody suggest a way to graft the ESS-mode behavior onto Python mode?
> I've appended the high-level descriptions of both functions.  I understand
> that the source code is available, and that I'm free to hack away to my
> heart's content.  I just don't have the skills at Emacs/Lisp required to do
> such a thing in a finite amount of time.
>
> Thanks and best wishes,
>
> -- Mike
>
>     Python mode
>     ===========
>
> C-c C-n runs the command python-next-statement, which is an
> interactive compiled Lisp function.
>
> It is bound to C-c C-n.
>
> (python-next-statement &optional COUNT)
>
> Go to start of next statement.
> With argument COUNT, do it COUNT times.  Stop at end of buffer.
> Return count of statements left to move.
>
> ----------
>
>     ESS mode
>     ========
>
> C-c C-n runs the command ess-eval-line-and-step, which is an
> interactive compiled Lisp function in `ess-inf.el'.
>
> It is bound to C-c C-n, C-c C-e C-n, <menu-bar> <ESS> <ESS Eval> <Eval
> line & step>.
>
> (ess-eval-line-and-step &optional SIMPLE-NEXT EVEN-EMPTY INVISIBLY)
>
> Evaluate the current line visibly and step to the "next" line.
> "next" = the next line with non-comment code _unless_ SIMPLE-NEXT is non-nil,
> possibly via prefix arg.  If 2nd arg EVEN-EMPTY [prefix as well],
> also send empty lines.    When the variable `ess-eval-empty' is non-nil
> both SIMPLE-NEXT and EVEN-EMPTY are interpreted as true.

i haven't coded python for few years and havn't used ess MODE, but if
all you need is to send the region to python to eval and display the
output in buffer, that's pretty easy. I wrote a tutorial about this
here:

〈Elisp Wrapper For Perl Scripts〉 http://xahlee.org/emacs/elisp_perl_wrapper.html

it's just 5 lines of elisp.

 Xah ∑ http://xahlee.org/ ☄