Writing Python with Emacs

python-emacs

Here are the steps I took to make Emacs have code-completion and PEP8 checking:

1. Install [Marmalade](http://marmalade-repo.org) by putting this in your .emacs

(require 'package)
(add-to-list 'package-archives 
    '("marmalade" .
      "http://marmalade-repo.org/packages/"))
(package-initialize)

2. In emacs, M-x package-install flymake

3. Add this to .emacs

;; flymake + pep8
(when (load "flymake" t)
 (defun flymake-pylint-init ()
   (let* ((temp-file (flymake-init-create-temp-buffer-copy
                      'flymake-create-temp-inplace))
          (local-file (file-relative-name
                       temp-file
                       (file-name-directory buffer-file-name))))
         (list "pep8" (list "--repeat" local-file))))

 (add-to-list 'flymake-allowed-file-name-masks
              '("\\.py\\'" flymake-pylint-init)))

(defun my-flymake-show-help ()
  (when (get-char-property (point) 'flymake-overlay)
    (let ((help (get-char-property (point) 'help-echo)))
      (if help (message "%s" help)))))

(add-hook 'post-command-hook 'my-flymake-show-help)
(add-hook 'find-file-hook 'flymake-find-file-hook)

4. Now, real-time PEP8 checking should happen. Hover over line to see error message.

5. To install [Jedi](https://github.com/davidhalter/jedi) (auto-complete):
  pip install jedi
  pip install epc

6. In emacs, M-x package-install jedi

7. Add the following to your .emacs

(add-hook 'python-mode-hook
  (lambda ()
         (auto-complete-mode 1)))
(add-hook 'python-mode-hook 'jedi:setup)
(setq jedi:setup-keys t)                      ; optional
(setq jedi:complete-on-dot t)                 ; optional


8. Now, auto-completion should happen as you type.