Generate Python comment bars in Emacs

Here's a simple custom feature that I use often when editing Python in Emacs.

(defun nate/insert-comment-bar ()
  "Insert '#' char from the current column up to `fill-column`.
Useful for inserting bars in source code comments."
  (interactive)
  (let* ((rightward-cols (- fill-column (current-column))))
    (if (>= rightward-cols 1)
        (dotimes (_ rightward-cols) (insert "#"))))

(global-set-key (kbd "C-c B") #'nate/insert-comment-bar)

This makes it easy to write code that look like this:

def simple_geotransform(x_res,
                        y_res,
                        upper_left_lon,
                        upper_left_lat,
                        width_x,
                        width_y):
    """
    Convenience function to construct a simple geotransform with 0
    row / column rotation.
    """

    ##################################################################
    # Parameters of geotransform. Places the geotiff on the map.
    # See: https://gdal.org/tutorials/geotransforms_tut.html
    # NOTE: the upper left of the world map is -x, +y.
    ##################################################################
    pixel_width_ns = width_x / x_res
    pixel_width_we = width_y / y_res
    geotransform = [upper_left_lon,
                    pixel_width_we,
                    0.0,
                    upper_left_lat,
                    0.0,
                    -1*pixel_width_ns]

    return GeotiffParams(x_res, y_res, geotransform)

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