Comment 2 for bug 1207015

Using today's trunk and the simplest possible Python file (no shebang),

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a = 3

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I now get:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  set-buffer(nil)
  (save-excursion (set-buffer buf) (goto-char (point-max)) (forward-line -1) (end-of-line) (save-excursion (if (re-search-backward py-shell-prompt-regexp nil t 1) (progn (and (re-search-forward "File \"<stdin>\", line 1,.*\n" nil t) (replace-match "")) (if (and (re-search-forward py-traceback-line-re limit t) (or (match-string 1) (match-string 3))) (progn (if (match-string-no-properties 1) (progn ... ... ... ... ...)) (add-to-list (quote err-p) line) (add-to-list (quote err-p) file) (overlay-put (make-overlay ... ...) (quote face) (quote highlight)) (forward-line 1) (if (looking-at "[ ]*\\([^ \n
\f]+\\)[ ]*$") (progn ... ... ... ... ...)))) err-p))))
  (let (line file bol err-p estring ecode limit) (save-excursion (set-buffer buf) (goto-char (point-max)) (forward-line -1) (end-of-line) (save-excursion (if (re-search-backward py-shell-prompt-regexp nil t 1) (progn (and (re-search-forward "File \"<stdin>\", line 1,.*\n" nil t) (replace-match "")) (if (and (re-search-forward py-traceback-line-re limit t) (or ... ...)) (progn (if ... ...) (add-to-list ... line) (add-to-list ... file) (overlay-put ... ... ...) (forward-line 1) (if ... ...))) err-p)))))
  py-postprocess-output-buffer(nil)
  (setq err-p (py-postprocess-output-buffer py-buffer-name))
  (progn (setq erg (py-execute-file-base nil file nil nil (or (and (boundp (quote py-orig-buffer-or-file)) py-orig-buffer-or-file) file))) (sit-for 0.1) (setq err-p (py-postprocess-output-buffer py-buffer-name)) (if py-enforce-output-buffer-p (progn (set-buffer (get-buffer-create py-output-buffer)) (erase-buffer) (insert erg) (py-shell-manage-windows py-output-buffer nil windows-config err-p)) (py-shell-manage-windows py-buffer-name nil windows-config err-p)) (if py-verbose-p (progn (message "Output buffer: %s" py-buffer-name))) (sit-for 0.1))
  (if (file-readable-p file) (progn (setq erg (py-execute-file-base nil file nil nil (or (and (boundp (quote py-orig-buffer-or-file)) py-orig-buffer-or-file) file))) (sit-for 0.1) (setq err-p (py-postprocess-output-buffer py-buffer-name)) (if py-enforce-output-buffer-p (progn (set-buffer (get-buffer-create py-output-buffer)) (erase-buffer) (insert erg) (py-shell-manage-windows py-output-buffer nil windows-config err-p)) (py-shell-manage-windows py-buffer-name nil windows-config err-p)) (if py-verbose-p (progn (message "Output buffer: %s" py-buffer-name))) (sit-for 0.1)) (message "%s not readable. %s" file "Do you have write permissions?"))
  (let ((windows-config (window-configuration-to-register 313465889)) erg err-p) (if (file-readable-p file) (progn (setq erg (py-execute-file-base nil file nil nil (or (and (boundp ...) py-orig-buffer-or-file) file))) (sit-for 0.1) (setq err-p (py-postprocess-output-buffer py-buffer-name)) (if py-enforce-output-buffer-p (progn (set-buffer (get-buffer-create py-output-buffer)) (erase-buffer) (insert erg) (py-shell-manage-windows py-output-buffer nil windows-config err-p)) (py-shell-manage-windows py-buffer-name nil windows-config err-p)) (if py-verbose-p (progn (message "Output buffer: %s" py-buffer-name))) (sit-for 0.1)) (message "%s not readable. %s" file "Do you have write permissions?")))
  py-execute-file("/Users/stanton/projects/ESOest/test2.py")
  (if file (py-execute-file file) (py-execute-region beg end))
  (let* ((py-master-file (or py-master-file (py-fetch-py-master-file))) (file (if py-master-file (expand-file-name py-master-file) (buffer-file-name))) (beg (point-min)) (end (point-max))) (if file (py-execute-file file) (py-execute-region beg end)))
  py-execute-buffer-base()
  py-execute-buffer()
  call-interactively(py-execute-buffer nil nil)