[O] can't get org-mode noweb tangle to work

[Charles R (Charlie) Martin]

I'm trying to get literate programming with `:noweb` syntax working in org-mode. I think I'm down to about the minimum case:

        #+TITLE: Console Tic Tac Toe

    #+SUBTITLE: A Literate Program in EMACS Org-Mode

    #+AUTHOR: Charlie Martin

    #+STARTUP: showall

    

    #+BEGIN_SRC python :tangle yes :noweb 

      import sys

      import os

    

      def main(args):

          <<initialize-the-game-board>>

    

      if __name__ == "__main__":

          main(sys.argv)

    #+END_SRC

    

    #+NAME: initialize-the-game-board

    #+BEGIN_SRC python :tangle yes :noweb

      board = [[-1 for x in range(3)] for y in range(3)]

    #+END_SRC

but when I tangle it I get:

    import sys

    import os

    

    def main(args):

        <<initialize-the-game-board>>

    

    if __name__ == "__main__":

        main(sys.argv)

    

    board = [[-1 for x in range(3)] for y in range(3)]

I've tried permuting the argument, flags, and so on to no avail.

EMACS version is 25.3.1 MacOS, org-mode 9.1.3