Install yasnippet and vala-snippets packages

elpa/yasnippet-20160924.2001/snippets/python-mode/.yas-setup.el

@@ -0,0 +1,24 @@
+(defvar yas-text)
+
+(defun python-split-args (arg-string)
+  "Split a python argument string into ((name, default)..) tuples"
+  (mapcar (lambda (x)
+             (split-string x "[[:blank:]]*=[[:blank:]]*" t))
+          (split-string arg-string "[[:blank:]]*,[[:blank:]]*" t)))
+
+(defun python-args-to-docstring ()
+  "return docstring format for the python arguments in yas-text"
+  (let* ((indent (concat "\n" (make-string (current-column) 32)))
+         (args (python-split-args yas-text))
+         (max-len (if args (apply 'max (mapcar (lambda (x) (length (nth 0 x))) args)) 0))
+         (formatted-args (mapconcat
+                (lambda (x)
+                   (concat (nth 0 x) (make-string (- max-len (length (nth 0 x))) ? ) " -- "
+                           (if (nth 1 x) (concat "\(default " (nth 1 x) "\)"))))
+                args
+                indent)))
+    (unless (string= formatted-args "")
+      (mapconcat 'identity (list "Keyword Arguments:" formatted-args) indent))))
+
+(add-hook 'python-mode-hook
+          '(lambda () (set (make-local-variable 'yas-indent-line) 'fixed)))