anchor.diff:  
   (defun execute-input (point string)
     (declare (ignore point))
  +  (unless (alive-process-p)
  +    (editor-error "Python process doesn't exist."))
     (lem-process:process-send-input *process*
                                     (concatenate 'string string (string #\newline))))
   
  
positive.code: 
  (defun get-repl-buffer ()
    (let ((buffer (make-buffer "*python*")))
      (change-buffer-mode buffer 'run-python-mode)
      buffer))
  
  (defun output-callback (string)
  
negative.code: (defpackage :lem-python-mode.run-python
    (:use :cl :lem :lem-python-mode)
    (:export :*python-run-command*
             :run-python))
  (in-package :lem-python-mode.run-python)
  
  (defvar *python-run-command* #-win32 "python"
                               #+win32 '("python" "-i"))
  
  (defvar *process* nil)
  
  