Emacs snippet to kill a line backwards to the first whitespace character.

custom-commands.el

(defun kill-back-to-indentation (arg)
  "Ignore ARG.  Kill lines backwards to the first whitespace character."
  (interactive "p")
  (let ((start (point)))
    (back-to-indentation)
    (kill-region start (point))))

(global-set-key (kbd "C-c DEL") 'backward-kill-to-start-of-line)

;;; Example (Python): (The cursor is $)
;;;
;;; class MyClass(object):
;;;   def print_info(self):
;;;     logger.info$('%r', info)
;;;
;;; Hit C-c DEL
;;;
;;; class MyClass(object):
;;;   def print_info(self):
;;;     $('%r', info)
;;;